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Annotation of mandoc/mandoc.1, Revision 1.174

1.174   ! schwarze    1: .\"    $Id: mandoc.1,v 1.173 2017/01/31 19:44:04 schwarze Exp $
1.1       kristaps    2: .\"
1.92      schwarze    3: .\" Copyright (c) 2009, 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
1.168     schwarze    4: .\" Copyright (c) 2012, 2014-2017 Ingo Schwarze <schwarze@openbsd.org>
1.1       kristaps    5: .\"
                      6: .\" Permission to use, copy, modify, and distribute this software for any
1.16      kristaps    7: .\" purpose with or without fee is hereby granted, provided that the above
                      8: .\" copyright notice and this permission notice appear in all copies.
1.1       kristaps    9: .\"
1.16      kristaps   10: .\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
                     11: .\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
                     12: .\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
                     13: .\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
                     14: .\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
                     15: .\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
                     16: .\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
1.1       kristaps   17: .\"
1.174   ! schwarze   18: .Dd $Mdocdate: January 31 2017 $
1.14      kristaps   19: .Dt MANDOC 1
1.1       kristaps   20: .Os
                     21: .Sh NAME
                     22: .Nm mandoc
1.8       kristaps   23: .Nd format and display UNIX manuals
1.1       kristaps   24: .Sh SYNOPSIS
                     25: .Nm mandoc
1.153     schwarze   26: .Op Fl acfhkl
1.156     schwarze   27: .Op Fl I Cm os Ns = Ns Ar name
                     28: .Op Fl K Ar encoding
1.8       kristaps   29: .Op Fl m Ns Ar format
1.156     schwarze   30: .Op Fl O Ar option
                     31: .Op Fl T Ar output
                     32: .Op Fl W Ar level
1.89      kristaps   33: .Op Ar
1.1       kristaps   34: .Sh DESCRIPTION
                     35: The
                     36: .Nm
1.26      kristaps   37: utility formats
1.8       kristaps   38: .Ux
1.57      kristaps   39: manual pages for display.
1.100     kristaps   40: .Pp
                     41: By default,
                     42: .Nm
                     43: reads
                     44: .Xr mdoc 7
                     45: or
                     46: .Xr man 7
                     47: text from stdin, implying
                     48: .Fl m Ns Cm andoc ,
                     49: and produces
1.156     schwarze   50: .Fl T Cm locale
1.100     kristaps   51: output.
                     52: .Pp
1.109     schwarze   53: The options are as follows:
1.19      kristaps   54: .Bl -tag -width Ds
1.107     schwarze   55: .It Fl a
                     56: If the standard output is a terminal device and
                     57: .Fl c
                     58: is not specified, use
                     59: .Xr more 1
                     60: to paginate the output, just like
                     61: .Xr man 1
                     62: would.
                     63: .It Fl c
                     64: Copy the formatted manual pages to the standard output without using
                     65: .Xr more 1
                     66: to paginate them.
                     67: This is the default.
                     68: It can be specified to override
                     69: .Fl a .
1.109     schwarze   70: .It Fl f
                     71: A synonym for
                     72: .Xr whatis 1 .
                     73: This overrides any earlier
                     74: .Fl k
                     75: and
                     76: .Fl l
                     77: options.
1.167     schwarze   78: .It Fl h
                     79: Display only the SYNOPSIS lines.
                     80: Implies
                     81: .Fl c .
1.156     schwarze   82: .It Fl I Cm os Ns = Ns Ar name
1.101     schwarze   83: Override the default operating system
                     84: .Ar name
                     85: for the
                     86: .Xr mdoc 7
                     87: .Sq \&Os
1.130     schwarze   88: and for the
                     89: .Xr man 7
                     90: .Sq \&TH
1.101     schwarze   91: macro.
1.156     schwarze   92: .It Fl K Ar encoding
1.119     schwarze   93: Specify the input encoding.
                     94: The supported
                     95: .Ar encoding
                     96: arguments are
                     97: .Cm us-ascii ,
                     98: .Cm iso-8859-1 ,
                     99: and
                    100: .Cm utf-8 .
                    101: If not specified, autodetection uses the first match:
                    102: .Bl -tag -width iso-8859-1
                    103: .It Cm utf-8
                    104: if the first three bytes of the input file
                    105: are the UTF-8 byte order mark (BOM, 0xefbbbf)
                    106: .It Ar encoding
                    107: if the first or second line of the input file matches the
                    108: .Sy emacs
                    109: mode line format
                    110: .Pp
                    111: .D1 .\e" -*- Oo ...; Oc coding: Ar encoding ; No -*-
                    112: .It Cm utf-8
                    113: if the first non-ASCII byte in the file introduces a valid UTF-8 sequence
                    114: .It Cm iso-8859-1
                    115: otherwise
                    116: .El
1.109     schwarze  117: .It Fl k
                    118: A synonym for
                    119: .Xr apropos 1 .
                    120: This overrides any earlier
                    121: .Fl f
                    122: and
                    123: .Fl l
                    124: options.
                    125: .It Fl l
                    126: A synonym for
                    127: .Fl a .
                    128: Also reverts any earlier
                    129: .Fl f
                    130: and
                    131: .Fl k
                    132: options.
1.19      kristaps  133: .It Fl m Ns Ar format
1.57      kristaps  134: Input format.
                    135: See
1.8       kristaps  136: .Sx Input Formats
1.57      kristaps  137: for available formats.
                    138: Defaults to
1.58      kristaps  139: .Fl m Ns Cm andoc .
1.156     schwarze  140: .It Fl O Ar option
1.57      kristaps  141: Comma-separated output options.
1.156     schwarze  142: .It Fl T Ar output
1.57      kristaps  143: Output format.
                    144: See
1.1       kristaps  145: .Sx Output Formats
1.57      kristaps  146: for available formats.
                    147: Defaults to
1.156     schwarze  148: .Fl T Cm locale .
                    149: .It Fl W Ar level
1.77      schwarze  150: Specify the minimum message
                    151: .Ar level
                    152: to be reported on the standard error output and to affect the exit status.
                    153: The
                    154: .Ar level
                    155: can be
1.133     schwarze  156: .Cm warning ,
                    157: .Cm error ,
1.77      schwarze  158: or
1.133     schwarze  159: .Cm unsupp ;
1.132     schwarze  160: .Cm all
1.77      schwarze  161: is an alias for
1.132     schwarze  162: .Cm warning .
                    163: By default,
                    164: .Nm
                    165: is silent.
1.77      schwarze  166: See
                    167: .Sx EXIT STATUS
                    168: and
                    169: .Sx DIAGNOSTICS
                    170: for details.
                    171: .Pp
                    172: The special option
1.156     schwarze  173: .Fl W Cm stop
1.77      schwarze  174: tells
                    175: .Nm
                    176: to exit after parsing a file that causes warnings or errors of at least
                    177: the requested level.
                    178: No formatted output will be produced from that file.
                    179: If both a
                    180: .Ar level
                    181: and
                    182: .Cm stop
                    183: are requested, they can be joined with a comma, for example
1.156     schwarze  184: .Fl W Cm error , Ns Cm stop .
1.58      kristaps  185: .It Ar file
                    186: Read input from zero or more files.
1.57      kristaps  187: If unspecified, reads from stdin.
                    188: If multiple files are specified,
1.2       kristaps  189: .Nm
                    190: will halt with the first failed parse.
1.1       kristaps  191: .El
1.109     schwarze  192: .Pp
                    193: In
                    194: .Fl f
                    195: and
                    196: .Fl k
                    197: mode,
                    198: .Nm
                    199: also supports the options
                    200: .Fl CMmOSsw
                    201: described in the
                    202: .Xr apropos 1
                    203: manual.
1.8       kristaps  204: .Ss Input Formats
                    205: The
                    206: .Nm
                    207: utility accepts
                    208: .Xr mdoc 7
                    209: and
                    210: .Xr man 7
                    211: input with
1.58      kristaps  212: .Fl m Ns Cm doc
1.8       kristaps  213: and
1.58      kristaps  214: .Fl m Ns Cm an ,
1.57      kristaps  215: respectively.
                    216: The
1.8       kristaps  217: .Xr mdoc 7
                    218: format is
                    219: .Em strongly
1.26      kristaps  220: recommended;
1.8       kristaps  221: .Xr man 7
                    222: should only be used for legacy manuals.
1.11      kristaps  223: .Pp
1.12      kristaps  224: A third option,
1.58      kristaps  225: .Fl m Ns Cm andoc ,
1.13      kristaps  226: which is also the default, determines encoding on-the-fly: if the first
1.26      kristaps  227: non-comment macro is
1.27      kristaps  228: .Sq \&Dd
1.13      kristaps  229: or
1.27      kristaps  230: .Sq \&Dt ,
1.26      kristaps  231: the
1.13      kristaps  232: .Xr mdoc 7
                    233: parser is used; otherwise, the
                    234: .Xr man 7
                    235: parser is used.
                    236: .Pp
                    237: If multiple
1.26      kristaps  238: files are specified with
1.58      kristaps  239: .Fl m Ns Cm andoc ,
1.57      kristaps  240: each has its file-type determined this way.
                    241: If multiple files are
1.13      kristaps  242: specified and
1.58      kristaps  243: .Fl m Ns Cm doc
1.12      kristaps  244: or
1.58      kristaps  245: .Fl m Ns Cm an
1.12      kristaps  246: is specified, then this format is used exclusively.
1.1       kristaps  247: .Ss Output Formats
                    248: The
                    249: .Nm
                    250: utility accepts the following
                    251: .Fl T
1.66      kristaps  252: arguments, which correspond to output modes:
1.156     schwarze  253: .Bl -tag -width "-T locale"
                    254: .It Fl T Cm ascii
1.81      kristaps  255: Produce 7-bit ASCII output.
1.57      kristaps  256: See
1.48      kristaps  257: .Sx ASCII Output .
1.156     schwarze  258: .It Fl T Cm html
1.116     kristaps  259: Produce HTML5, CSS1, and MathML output.
1.57      kristaps  260: See
1.48      kristaps  261: .Sx HTML Output .
1.156     schwarze  262: .It Fl T Cm lint
1.58      kristaps  263: Parse only: produce no output.
                    264: Implies
1.156     schwarze  265: .Fl W Cm warning .
                    266: .It Fl T Cm locale
1.93      schwarze  267: Encode output using the current locale.
1.128     schwarze  268: This is the default.
1.93      schwarze  269: See
                    270: .Sx Locale Output .
1.156     schwarze  271: .It Fl T Cm man
1.95      kristaps  272: Produce
1.91      schwarze  273: .Xr man 7
1.95      kristaps  274: format output.
                    275: See
                    276: .Sx Man Output .
1.156     schwarze  277: .It Fl T Cm pdf
1.73      kristaps  278: Produce PDF output.
                    279: See
                    280: .Sx PDF Output .
1.156     schwarze  281: .It Fl T Cm ps
1.62      kristaps  282: Produce PostScript output.
                    283: See
                    284: .Sx PostScript Output .
1.156     schwarze  285: .It Fl T Cm tree
1.58      kristaps  286: Produce an indented parse tree.
1.161     schwarze  287: See
                    288: .Sx Syntax tree output .
1.156     schwarze  289: .It Fl T Cm utf8
1.93      schwarze  290: Encode output in the UTF\-8 multi-byte format.
                    291: See
                    292: .Sx UTF\-8 Output .
1.156     schwarze  293: .It Fl T Cm xhtml
1.114     kristaps  294: This is a synonym for
1.156     schwarze  295: .Fl T Cm html .
1.1       kristaps  296: .El
1.13      kristaps  297: .Pp
                    298: If multiple input files are specified, these will be processed by the
                    299: corresponding filter in-order.
1.66      kristaps  300: .Ss ASCII Output
                    301: Output produced by
1.156     schwarze  302: .Fl T Cm ascii
1.128     schwarze  303: is rendered in standard 7-bit ASCII documented in
1.66      kristaps  304: .Xr ascii 7 .
                    305: .Pp
                    306: Font styles are applied by using back-spaced encoding such that an
                    307: underlined character
                    308: .Sq c
                    309: is rendered as
                    310: .Sq _ Ns \e[bs] Ns c ,
                    311: where
                    312: .Sq \e[bs]
                    313: is the back-space character number 8.
                    314: Emboldened characters are rendered as
                    315: .Sq c Ns \e[bs] Ns c .
                    316: .Pp
                    317: The special characters documented in
                    318: .Xr mandoc_char 7
                    319: are rendered best-effort in an ASCII equivalent.
                    320: .Pp
                    321: Output width is limited to 78 visible columns unless literal input lines
                    322: exceed this limit.
                    323: .Pp
                    324: The following
                    325: .Fl O
                    326: arguments are accepted:
1.19      kristaps  327: .Bl -tag -width Ds
1.98      schwarze  328: .It Cm indent Ns = Ns Ar indent
                    329: The left margin for normal text is set to
                    330: .Ar indent
                    331: blank characters instead of the default of five for
                    332: .Xr mdoc 7
                    333: and seven for
                    334: .Xr man 7 .
                    335: Increasing this is not recommended; it may result in degraded formatting,
1.99      schwarze  336: for example overfull lines or ugly line breaks.
1.66      kristaps  337: .It Cm width Ns = Ns Ar width
                    338: The output width is set to
                    339: .Ar width ,
1.141     schwarze  340: which will normalise to \(>=58.
1.1       kristaps  341: .El
1.66      kristaps  342: .Ss HTML Output
                    343: Output produced by
1.156     schwarze  344: .Fl T Cm html
1.114     kristaps  345: conforms to HTML5 using optional self-closing tags.
1.116     kristaps  346: Default styles use only CSS1.
                    347: Equations rendered from
                    348: .Xr eqn 7
                    349: blocks use MathML.
1.66      kristaps  350: .Pp
1.61      kristaps  351: The
1.164     schwarze  352: .Pa mandoc.css
1.83      kristaps  353: file documents style-sheet classes available for customising output.
                    354: If a style-sheet is not specified with
1.156     schwarze  355: .Fl O Cm style ,
                    356: .Fl T Cm html
1.114     kristaps  357: defaults to simple output (via an embedded style-sheet)
                    358: readable in any graphical or text-based web
1.83      kristaps  359: browser.
1.66      kristaps  360: .Pp
1.89      kristaps  361: Special characters are rendered in decimal-encoded UTF\-8.
1.66      kristaps  362: .Pp
                    363: The following
1.64      kristaps  364: .Fl O
1.66      kristaps  365: arguments are accepted:
1.37      kristaps  366: .Bl -tag -width Ds
1.94      kristaps  367: .It Cm fragment
1.123     schwarze  368: Omit the <!DOCTYPE> declaration and the <html>, <head>, and <body>
                    369: elements and only emit the subtree below the <body> element.
1.94      kristaps  370: The
                    371: .Cm style
1.97      schwarze  372: argument will be ignored.
1.94      kristaps  373: This is useful when embedding manual content within existing documents.
1.64      kristaps  374: .It Cm includes Ns = Ns Ar fmt
1.40      kristaps  375: The string
                    376: .Ar fmt ,
1.49      kristaps  377: for example,
1.40      kristaps  378: .Ar ../src/%I.html ,
                    379: is used as a template for linked header files (usually via the
                    380: .Sq \&In
1.57      kristaps  381: macro).
                    382: Instances of
1.43      kristaps  383: .Sq \&%I
1.57      kristaps  384: are replaced with the include filename.
                    385: The default is not to present a
1.40      kristaps  386: hyperlink.
1.64      kristaps  387: .It Cm man Ns = Ns Ar fmt
1.39      kristaps  388: The string
                    389: .Ar fmt ,
1.49      kristaps  390: for example,
1.39      kristaps  391: .Ar ../html%S/%N.%S.html ,
                    392: is used as a template for linked manuals (usually via the
1.37      kristaps  393: .Sq \&Xr
1.57      kristaps  394: macro).
                    395: Instances of
1.43      kristaps  396: .Sq \&%N
1.40      kristaps  397: and
                    398: .Sq %S
                    399: are replaced with the linked manual's name and section, respectively.
1.57      kristaps  400: If no section is included, section 1 is assumed.
                    401: The default is not to
1.40      kristaps  402: present a hyperlink.
1.64      kristaps  403: .It Cm style Ns = Ns Ar style.css
1.58      kristaps  404: The file
                    405: .Ar style.css
                    406: is used for an external style-sheet.
                    407: This must be a valid absolute or
                    408: relative URI.
1.61      kristaps  409: .El
1.93      schwarze  410: .Ss Locale Output
                    411: Locale-depending output encoding is triggered with
1.156     schwarze  412: .Fl T Cm locale .
1.128     schwarze  413: This is the default.
                    414: .Pp
1.93      schwarze  415: This option is not available on all systems: systems without locale
                    416: support, or those whose internal representation is not natively UCS-4,
                    417: will fall back to
1.156     schwarze  418: .Fl T Cm ascii .
1.93      schwarze  419: See
                    420: .Sx ASCII Output
                    421: for font style specification and available command-line arguments.
1.95      kristaps  422: .Ss Man Output
                    423: Translate input format into
                    424: .Xr man 7
                    425: output format.
1.102     schwarze  426: This is useful for distributing manual sources to legacy systems
1.96      kristaps  427: lacking
1.95      kristaps  428: .Xr mdoc 7
                    429: formatters.
                    430: .Pp
                    431: If
                    432: .Xr mdoc 7
                    433: is passed as input, it is translated into
1.97      schwarze  434: .Xr man 7 .
                    435: If the input format is
1.95      kristaps  436: .Xr man 7 ,
1.97      schwarze  437: the input is copied to the output, expanding any
1.95      kristaps  438: .Xr roff 7
                    439: .Sq so
1.97      schwarze  440: requests.
                    441: The parser is also run, and as usual, the
                    442: .Fl W
                    443: level controls which
                    444: .Sx DIAGNOSTICS
                    445: are displayed before copying the input to the output.
1.93      schwarze  446: .Ss PDF Output
                    447: PDF-1.1 output may be generated by
1.156     schwarze  448: .Fl T Cm pdf .
1.93      schwarze  449: See
                    450: .Sx PostScript Output
                    451: for
                    452: .Fl O
                    453: arguments and defaults.
1.62      kristaps  454: .Ss PostScript Output
1.65      kristaps  455: PostScript
                    456: .Qq Adobe-3.0
                    457: Level-2 pages may be generated by
1.156     schwarze  458: .Fl T Cm ps .
1.67      kristaps  459: Output pages default to letter sized and are rendered in the Times font
1.70      kristaps  460: family, 11-point.
                    461: Margins are calculated as 1/9 the page length and width.
1.71      kristaps  462: Line-height is 1.4m.
1.66      kristaps  463: .Pp
                    464: Special characters are rendered as in
                    465: .Sx ASCII Output .
                    466: .Pp
                    467: The following
                    468: .Fl O
                    469: arguments are accepted:
                    470: .Bl -tag -width Ds
                    471: .It Cm paper Ns = Ns Ar name
                    472: The paper size
                    473: .Ar name
                    474: may be one of
1.68      kristaps  475: .Ar a3 ,
                    476: .Ar a4 ,
                    477: .Ar a5 ,
                    478: .Ar legal ,
1.66      kristaps  479: or
                    480: .Ar letter .
1.68      kristaps  481: You may also manually specify dimensions as
                    482: .Ar NNxNN ,
                    483: width by height in millimetres.
                    484: If an unknown value is encountered,
                    485: .Ar letter
                    486: is used.
1.66      kristaps  487: .El
1.93      schwarze  488: .Ss UTF\-8 Output
                    489: Use
1.156     schwarze  490: .Fl T Cm utf8
1.93      schwarze  491: to force a UTF\-8 locale.
1.73      kristaps  492: See
1.93      schwarze  493: .Sx Locale Output
                    494: for details and options.
1.161     schwarze  495: .Ss Syntax tree output
                    496: Use
                    497: .Fl T Cm tree
                    498: to show a human readable representation of the syntax tree.
                    499: It is useful for debugging the source code of manual pages.
1.162     schwarze  500: The exact format is subject to change, so don't write parsers for it.
1.170     schwarze  501: .Pp
                    502: The first paragraph shows meta data found in the
                    503: .Xr mdoc 7
                    504: prologue, on the
                    505: .Xr man 7
                    506: .Ic \&TH
                    507: line, or the fallbacks used.
                    508: .Pp
                    509: In the tree dump, each output line shows one syntax tree node.
1.161     schwarze  510: Child nodes are indented with respect to their parent node.
                    511: The columns are:
                    512: .Pp
                    513: .Bl -enum -compact
                    514: .It
                    515: For macro nodes, the macro name; for text and
                    516: .Xr tbl 7
1.162     schwarze  517: nodes, the content.
                    518: There is a special format for
1.161     schwarze  519: .Xr eqn 7
                    520: nodes.
                    521: .It
                    522: Node type (text, elem, block, head, body, body-end, tail, tbl, eqn).
                    523: .It
                    524: Flags:
                    525: .Bl -dash -compact
                    526: .It
                    527: An opening parenthesis if the node is an opening delimiter.
                    528: .It
                    529: An asterisk if the node starts a new input line.
                    530: .It
                    531: The input line number (starting at one).
                    532: .It
                    533: A colon.
                    534: .It
                    535: The input column number (starting at one).
                    536: .It
                    537: A closing parenthesis if the node is a closing delimiter.
                    538: .It
                    539: A full stop if the node ends a sentence.
1.169     schwarze  540: .It
1.174   ! schwarze  541: BROKEN if the node is a block broken by another block.
        !           542: .It
1.169     schwarze  543: NOSRC if the node is not in the input file,
                    544: but automatically generated from macros.
                    545: .It
                    546: NOPRT if the node is not supposed to generate output
                    547: for any output format.
1.161     schwarze  548: .El
1.174   ! schwarze  549: .El
        !           550: .Pp
        !           551: The following
        !           552: .Fl O
        !           553: argument is accepted:
        !           554: .Bl -tag -width Ds
        !           555: .It Cm noval
        !           556: Skip validation and show the unvalidated syntax tree.
        !           557: This can help to find out whether a given behaviour is caused by
        !           558: the parser or by the validator.
        !           559: Meta data is not available in this case.
1.161     schwarze  560: .El
1.108     schwarze  561: .Sh ENVIRONMENT
                    562: .Bl -tag -width MANPAGER
                    563: .It Ev MANPAGER
                    564: Any non-empty value of the environment variable
                    565: .Ev MANPAGER
                    566: will be used instead of the standard pagination program,
                    567: .Xr more 1 .
                    568: .It Ev PAGER
                    569: Specifies the pagination program to use when
                    570: .Ev MANPAGER
                    571: is not defined.
                    572: If neither PAGER nor MANPAGER is defined,
1.159     schwarze  573: .Xr more 1
                    574: .Fl s
1.108     schwarze  575: will be used.
                    576: .El
1.77      schwarze  577: .Sh EXIT STATUS
                    578: The
                    579: .Nm
                    580: utility exits with one of the following values, controlled by the message
                    581: .Ar level
                    582: associated with the
                    583: .Fl W
                    584: option:
                    585: .Pp
                    586: .Bl -tag -width Ds -compact
                    587: .It 0
                    588: No warnings or errors occurred, or those that did were ignored because
                    589: they were lower than the requested
                    590: .Ar level .
                    591: .It 2
                    592: At least one warning occurred, but no error, and
1.156     schwarze  593: .Fl W Cm warning
1.77      schwarze  594: was specified.
                    595: .It 3
1.133     schwarze  596: At least one parsing error occurred,
                    597: but no unsupported feature was encountered, and
1.156     schwarze  598: .Fl W Cm error
1.133     schwarze  599: or
1.156     schwarze  600: .Fl W Cm warning
1.133     schwarze  601: was specified.
                    602: .It 4
1.134     schwarze  603: At least one unsupported feature was encountered, and
1.156     schwarze  604: .Fl W Cm unsupp ,
                    605: .Fl W Cm error
1.77      schwarze  606: or
1.156     schwarze  607: .Fl W Cm warning
1.77      schwarze  608: was specified.
                    609: .It 5
                    610: Invalid command line arguments were specified.
                    611: No input files have been read.
                    612: .It 6
1.131     schwarze  613: An operating system error occurred, for example exhaustion
                    614: of memory, file descriptors, or process table entries.
1.77      schwarze  615: Such errors cause
                    616: .Nm
                    617: to exit at once, possibly in the middle of parsing or formatting a file.
                    618: .El
                    619: .Pp
                    620: Note that selecting
1.156     schwarze  621: .Fl T Cm lint
1.77      schwarze  622: output mode implies
1.156     schwarze  623: .Fl W Cm warning .
1.1       kristaps  624: .Sh EXAMPLES
1.13      kristaps  625: To page manuals to the terminal:
1.1       kristaps  626: .Pp
1.156     schwarze  627: .Dl $ mandoc \-W all,stop mandoc.1 2\*(Gt&1 | less
1.82      kristaps  628: .Dl $ mandoc mandoc.1 mdoc.3 mdoc.7 | less
1.28      kristaps  629: .Pp
1.41      kristaps  630: To produce HTML manuals with
1.164     schwarze  631: .Pa mandoc.css
1.41      kristaps  632: as the style-sheet:
1.38      kristaps  633: .Pp
1.164     schwarze  634: .Dl $ mandoc \-T html -O style=mandoc.css mdoc.7 \*(Gt mdoc.7.html
1.38      kristaps  635: .Pp
1.28      kristaps  636: To check over a large set of manuals:
                    637: .Pp
1.158     schwarze  638: .Dl $ mandoc \-T lint \(gafind /usr/src -name \e*\e.[1-9]\(ga
1.66      kristaps  639: .Pp
                    640: To produce a series of PostScript manuals for A4 paper:
                    641: .Pp
1.156     schwarze  642: .Dl $ mandoc \-T ps \-O paper=a4 mdoc.7 man.7 \*(Gt manuals.ps
1.91      schwarze  643: .Pp
                    644: Convert a modern
                    645: .Xr mdoc 7
                    646: manual to the older
                    647: .Xr man 7
                    648: format, for use on systems lacking an
                    649: .Xr mdoc 7
                    650: parser:
                    651: .Pp
1.156     schwarze  652: .Dl $ mandoc \-T man foo.mdoc \*(Gt foo.man
1.77      schwarze  653: .Sh DIAGNOSTICS
1.106     schwarze  654: Messages displayed by
                    655: .Nm
                    656: follow this format:
1.77      schwarze  657: .Pp
1.106     schwarze  658: .D1 Nm Ns : Ar file : Ns Ar line : Ns Ar column : level : message : macro args
1.77      schwarze  659: .Pp
1.106     schwarze  660: Line and column numbers start at 1.
                    661: Both are omitted for messages referring to an input file as a whole.
                    662: Macro names and arguments are omitted where meaningless.
                    663: Fatal messages about invalid command line arguments
                    664: or operating system errors, for example when memory is exhausted,
                    665: may also omit the
                    666: .Ar file
1.104     schwarze  667: and
1.106     schwarze  668: .Ar level
                    669: fields.
1.104     schwarze  670: .Pp
1.77      schwarze  671: Message levels have the following meanings:
                    672: .Bl -tag -width "warning"
1.133     schwarze  673: .It Cm unsupp
                    674: An input file uses unsupported low-level
                    675: .Xr roff 7
                    676: features.
                    677: The output may be incomplete and/or misformatted,
                    678: so using GNU troff instead of
                    679: .Nm
                    680: to process the file may be preferable.
1.77      schwarze  681: .It Cm error
1.133     schwarze  682: An input file contains invalid syntax that cannot be safely interpreted.
1.77      schwarze  683: By discarding part of the input or inserting missing tokens,
                    684: the parser is able to continue, and the error does not prevent
                    685: generation of formatted output, but typically, preparing that
                    686: output involves information loss, broken document structure
1.133     schwarze  687: or unintended formatting, no matter whether
                    688: .Nm
                    689: or GNU troff is used.
                    690: In many cases, the output of
                    691: .Nm
                    692: and GNU troff is identical, but in some,
                    693: .Nm
                    694: is more resilient than GNU troff with respect to malformed input.
1.131     schwarze  695: .Pp
                    696: Non-existent or unreadable input files are also reported on the
                    697: .Cm error
                    698: level.
                    699: In that case, the parser cannot even be started and no output
                    700: is produced from those input files.
1.77      schwarze  701: .It Cm warning
                    702: An input file uses obsolete, discouraged or non-portable syntax.
                    703: All the same, the meaning of the input is unambiguous and a correct
                    704: rendering can be produced.
                    705: Documents causing warnings may render poorly when using other
                    706: formatting tools instead of
                    707: .Nm .
                    708: .El
                    709: .Pp
                    710: Messages of the
1.133     schwarze  711: .Cm warning ,
                    712: .Cm error ,
1.77      schwarze  713: and
1.133     schwarze  714: .Cm unsupp
1.131     schwarze  715: levels except those about non-existent or unreadable input files
                    716: are hidden unless their level, or a lower level, is requested using a
1.77      schwarze  717: .Fl W
                    718: option or
1.156     schwarze  719: .Fl T Cm lint
1.77      schwarze  720: output mode.
1.106     schwarze  721: .Ss Warnings related to the document prologue
                    722: .Bl -ohang
                    723: .It Sy "missing manual title, using UNTITLED"
                    724: .Pq mdoc
                    725: A
                    726: .Ic \&Dt
                    727: macro has no arguments, or there is no
                    728: .Ic \&Dt
                    729: macro before the first non-prologue macro.
                    730: .It Sy "missing manual title, using \(dq\(dq"
                    731: .Pq man
                    732: There is no
                    733: .Ic \&TH
                    734: macro, or it has no arguments.
                    735: .It Sy "lower case character in document title"
                    736: .Pq mdoc , man
                    737: The title is still used as given in the
                    738: .Ic \&Dt
                    739: or
                    740: .Ic \&TH
                    741: macro.
                    742: .It Sy "missing manual section, using \(dq\(dq"
                    743: .Pq mdoc , man
                    744: A
                    745: .Ic \&Dt
                    746: or
                    747: .Ic \&TH
                    748: macro lacks the mandatory section argument.
                    749: .It Sy "unknown manual section"
                    750: .Pq mdoc
                    751: The section number in a
                    752: .Ic \&Dt
                    753: line is invalid, but still used.
                    754: .It Sy "missing date, using today's date"
                    755: .Pq mdoc, man
                    756: The document was parsed as
                    757: .Xr mdoc 7
                    758: and it has no
                    759: .Ic \&Dd
                    760: macro, or the
                    761: .Ic \&Dd
                    762: macro has no arguments or only empty arguments;
                    763: or the document was parsed as
                    764: .Xr man 7
                    765: and it has no
                    766: .Ic \&TH
                    767: macro, or the
                    768: .Ic \&TH
                    769: macro has less than three arguments or its third argument is empty.
                    770: .It Sy "cannot parse date, using it verbatim"
                    771: .Pq mdoc , man
                    772: The date given in a
                    773: .Ic \&Dd
                    774: or
                    775: .Ic \&TH
                    776: macro does not follow the conventional format.
                    777: .It Sy "missing Os macro, using \(dq\(dq"
                    778: .Pq mdoc
                    779: The default or current system is not shown in this case.
                    780: .It Sy "duplicate prologue macro"
                    781: .Pq mdoc
                    782: One of the prologue macros occurs more than once.
                    783: The last instance overrides all previous ones.
                    784: .It Sy "late prologue macro"
                    785: .Pq mdoc
                    786: A
                    787: .Ic \&Dd
                    788: or
                    789: .Ic \&Os
                    790: macro occurs after some non-prologue macro, but still takes effect.
                    791: .It Sy "skipping late title macro"
                    792: .Pq mdoc
                    793: The
                    794: .Ic \&Dt
1.152     schwarze  795: macro appears after the first non-prologue macro.
                    796: Traditional formatters cannot handle this because
                    797: they write the page header before parsing the document body.
1.106     schwarze  798: Even though this technical restriction does not apply to
                    799: .Nm ,
                    800: traditional semantics is preserved.
                    801: The late macro is discarded including its arguments.
                    802: .It Sy "prologue macros out of order"
                    803: .Pq mdoc
                    804: The prologue macros are not given in the conventional order
                    805: .Ic \&Dd ,
                    806: .Ic \&Dt ,
                    807: .Ic \&Os .
                    808: All three macros are used even when given in another order.
                    809: .El
                    810: .Ss Warnings regarding document structure
                    811: .Bl -ohang
                    812: .It Sy ".so is fragile, better use ln(1)"
                    813: .Pq roff
                    814: Including files only works when the parser program runs with the correct
                    815: current working directory.
                    816: .It Sy "no document body"
                    817: .Pq mdoc , man
                    818: The document body contains neither text nor macros.
                    819: An empty document is shown, consisting only of a header and a footer line.
                    820: .It Sy "content before first section header"
                    821: .Pq mdoc , man
                    822: Some macros or text precede the first
                    823: .Ic \&Sh
                    824: or
                    825: .Ic \&SH
                    826: section header.
                    827: The offending macros and text are parsed and added to the top level
                    828: of the syntax tree, outside any section block.
                    829: .It Sy "first section is not NAME"
                    830: .Pq mdoc
                    831: The argument of the first
                    832: .Ic \&Sh
                    833: macro is not
                    834: .Sq NAME .
                    835: This may confuse
                    836: .Xr makewhatis 8
                    837: and
                    838: .Xr apropos 1 .
1.168     schwarze  839: .It Sy "NAME section without Nm before Nd"
1.106     schwarze  840: .Pq mdoc
1.155     schwarze  841: The NAME section does not contain any
                    842: .Ic \&Nm
1.168     schwarze  843: child macro before the first
                    844: .Ic \&Nd
                    845: macro.
1.155     schwarze  846: .It Sy "NAME section without description"
                    847: .Pq mdoc
                    848: The NAME section lacks the mandatory
                    849: .Ic \&Nd
                    850: child macro.
                    851: .It Sy "description not at the end of NAME"
                    852: .Pq mdoc
                    853: The NAME section does contain an
1.106     schwarze  854: .Ic \&Nd
1.155     schwarze  855: child macro, but other content follows it.
                    856: .It Sy "bad NAME section content"
                    857: .Pq mdoc
                    858: The NAME section contains plain text or macros other than
                    859: .Ic \&Nm
1.106     schwarze  860: and
1.155     schwarze  861: .Ic \&Nd .
1.168     schwarze  862: .It Sy "missing comma before name"
                    863: .Pq mdoc
                    864: The NAME section contains an
                    865: .Ic \&Nm
                    866: macro that is neither the first one nor preceded by a comma.
1.142     schwarze  867: .It Sy "missing description line, using \(dq\(dq"
                    868: .Pq mdoc
                    869: The
                    870: .Ic \&Nd
                    871: macro lacks the required argument.
                    872: The title line of the manual will end after the dash.
1.106     schwarze  873: .It Sy "sections out of conventional order"
                    874: .Pq mdoc
                    875: A standard section occurs after another section it usually precedes.
                    876: All section titles are used as given,
                    877: and the order of sections is not changed.
                    878: .It Sy "duplicate section title"
                    879: .Pq mdoc
                    880: The same standard section title occurs more than once.
                    881: .It Sy "unexpected section"
                    882: .Pq mdoc
                    883: A standard section header occurs in a section of the manual
                    884: where it normally isn't useful.
1.112     schwarze  885: .It Sy "unusual Xr order"
                    886: .Pq mdoc
                    887: In the SEE ALSO section, an
                    888: .Ic \&Xr
                    889: macro with a lower section number follows one with a higher number,
                    890: or two
                    891: .Ic \&Xr
1.157     schwarze  892: macros referring to the same section are out of alphabetical order.
1.112     schwarze  893: .It Sy "unusual Xr punctuation"
                    894: .Pq mdoc
                    895: In the SEE ALSO section, punctuation between two
                    896: .Ic \&Xr
                    897: macros differs from a single comma, or there is trailing punctuation
                    898: after the last
                    899: .Ic \&Xr
                    900: macro.
1.111     schwarze  901: .It Sy "AUTHORS section without An macro"
                    902: .Pq mdoc
                    903: An AUTHORS sections contains no
                    904: .Ic \&An
                    905: macros, or only empty ones.
                    906: Probably, there are author names lacking markup.
1.106     schwarze  907: .El
                    908: .Ss "Warnings related to macros and nesting"
                    909: .Bl -ohang
                    910: .It Sy "obsolete macro"
                    911: .Pq mdoc
                    912: See the
                    913: .Xr mdoc 7
                    914: manual for replacements.
1.126     schwarze  915: .It Sy "macro neither callable nor escaped"
                    916: .Pq mdoc
                    917: The name of a macro that is not callable appears on a macro line.
                    918: It is printed verbatim.
1.152     schwarze  919: If the intention is to call it, move it to its own input line;
1.126     schwarze  920: otherwise, escape it by prepending
                    921: .Sq \e& .
1.106     schwarze  922: .It Sy "skipping paragraph macro"
                    923: In
                    924: .Xr mdoc 7
                    925: documents, this happens
                    926: .Bl -dash -compact
                    927: .It
                    928: at the beginning and end of sections and subsections
                    929: .It
                    930: right before non-compact lists and displays
                    931: .It
                    932: at the end of items in non-column, non-compact lists
                    933: .It
                    934: and for multiple consecutive paragraph macros.
                    935: .El
                    936: In
                    937: .Xr man 7
                    938: documents, it happens
                    939: .Bl -dash -compact
                    940: .It
                    941: for empty
                    942: .Ic \&P ,
                    943: .Ic \&PP ,
                    944: and
                    945: .Ic \&LP
                    946: macros
                    947: .It
                    948: for
                    949: .Ic \&IP
                    950: macros having neither head nor body arguments
                    951: .It
                    952: for
                    953: .Ic \&br
                    954: or
                    955: .Ic \&sp
                    956: right after
                    957: .Ic \&SH
                    958: or
                    959: .Ic \&SS
                    960: .El
                    961: .It Sy "moving paragraph macro out of list"
                    962: .Pq mdoc
                    963: A list item in a
                    964: .Ic \&Bl
                    965: list contains a trailing paragraph macro.
                    966: The paragraph macro is moved after the end of the list.
                    967: .It Sy "skipping no-space macro"
                    968: .Pq mdoc
                    969: An input line begins with an
                    970: .Ic \&Ns
                    971: macro.
                    972: The macro is ignored.
                    973: .It Sy "blocks badly nested"
                    974: .Pq mdoc
                    975: If two blocks intersect, one should completely contain the other.
                    976: Otherwise, rendered output is likely to look strange in any output
                    977: format, and rendering in SGML-based output formats is likely to be
                    978: outright wrong because such languages do not support badly nested
                    979: blocks at all.
                    980: Typical examples of badly nested blocks are
                    981: .Qq Ic \&Ao \&Bo \&Ac \&Bc
                    982: and
                    983: .Qq Ic \&Ao \&Bq \&Ac .
                    984: In these examples,
                    985: .Ic \&Ac
                    986: breaks
                    987: .Ic \&Bo
                    988: and
                    989: .Ic \&Bq ,
                    990: respectively.
                    991: .It Sy "nested displays are not portable"
                    992: .Pq mdoc
                    993: A
                    994: .Ic \&Bd ,
                    995: .Ic \&D1 ,
                    996: or
                    997: .Ic \&Dl
                    998: display occurs nested inside another
                    999: .Ic \&Bd
                   1000: display.
                   1001: This works with
                   1002: .Nm ,
                   1003: but fails with most other implementations.
                   1004: .It Sy "moving content out of list"
                   1005: .Pq mdoc
                   1006: A
                   1007: .Ic \&Bl
                   1008: list block contains text or macros before the first
                   1009: .Ic \&It
                   1010: macro.
                   1011: The offending children are moved before the beginning of the list.
                   1012: .It Sy "fill mode already enabled, skipping"
                   1013: .Pq man
                   1014: A
                   1015: .Ic \&fi
                   1016: request occurs even though the document is still in fill mode,
                   1017: or already switched back to fill mode.
                   1018: It has no effect.
                   1019: .It Sy "fill mode already disabled, skipping"
                   1020: .Pq man
                   1021: An
                   1022: .Ic \&nf
                   1023: request occurs even though the document already switched to no-fill mode
                   1024: and did not switch back to fill mode yet.
                   1025: It has no effect.
                   1026: .It Sy "line scope broken"
                   1027: .Pq man
                   1028: While parsing the next-line scope of the previous macro,
                   1029: another macro is found that prematurely terminates the previous one.
                   1030: The previous, interrupted macro is deleted from the parse tree.
                   1031: .El
                   1032: .Ss "Warnings related to missing arguments"
                   1033: .Bl -ohang
                   1034: .It Sy "skipping empty request"
1.118     schwarze 1035: .Pq roff , eqn
                   1036: The macro name is missing from a macro definition request,
                   1037: or an
                   1038: .Xr eqn 7
                   1039: control statement or operation keyword lacks its required argument.
1.106     schwarze 1040: .It Sy "conditional request controls empty scope"
                   1041: .Pq roff
                   1042: A conditional request is only useful if any of the following
                   1043: follows it on the same logical input line:
                   1044: .Bl -dash -compact
                   1045: .It
                   1046: The
                   1047: .Sq \e{
                   1048: keyword to open a multi-line scope.
                   1049: .It
                   1050: A request or macro or some text, resulting in a single-line scope.
                   1051: .It
                   1052: The immediate end of the logical line without any intervening whitespace,
                   1053: resulting in next-line scope.
                   1054: .El
                   1055: Here, a conditional request is followed by trailing whitespace only,
                   1056: and there is no other content on its logical input line.
                   1057: Note that it doesn't matter whether the logical input line is split
                   1058: across multiple physical input lines using
                   1059: .Sq \e
                   1060: line continuation characters.
                   1061: This is one of the rare cases
                   1062: where trailing whitespace is syntactically significant.
                   1063: The conditional request controls a scope containing whitespace only,
                   1064: so it is unlikely to have a significant effect,
                   1065: except that it may control a following
                   1066: .Ic \&el
                   1067: clause.
                   1068: .It Sy "skipping empty macro"
                   1069: .Pq mdoc
1.147     schwarze 1070: The indicated macro has no arguments and hence no effect.
                   1071: .It Sy "empty block"
                   1072: .Pq mdoc , man
                   1073: A
                   1074: .Ic \&Bd ,
                   1075: .Ic \&Bk ,
                   1076: .Ic \&Bl ,
                   1077: .Ic \&D1 ,
                   1078: .Ic \&Dl ,
                   1079: .Ic \&RS ,
                   1080: or
                   1081: .Ic \&UR
                   1082: block contains nothing in its body and will produce no output.
1.106     schwarze 1083: .It Sy "empty argument, using 0n"
                   1084: .Pq mdoc
                   1085: The required width is missing after
                   1086: .Ic \&Bd
                   1087: or
                   1088: .Ic \&Bl
                   1089: .Fl offset
                   1090: or
                   1091: .Fl width.
                   1092: .It Sy "missing display type, using -ragged"
                   1093: .Pq mdoc
                   1094: The
                   1095: .Ic \&Bd
                   1096: macro is invoked without the required display type.
                   1097: .It Sy "list type is not the first argument"
                   1098: .Pq mdoc
                   1099: In a
                   1100: .Ic \&Bl
                   1101: macro, at least one other argument precedes the type argument.
                   1102: The
                   1103: .Nm
                   1104: utility copes with any argument order, but some other
                   1105: .Xr mdoc 7
                   1106: implementations do not.
                   1107: .It Sy "missing -width in -tag list, using 8n"
                   1108: .Pq mdoc
                   1109: Every
                   1110: .Ic \&Bl
                   1111: macro having the
                   1112: .Fl tag
                   1113: argument requires
                   1114: .Fl width ,
                   1115: too.
                   1116: .It Sy "missing utility name, using \(dq\(dq"
                   1117: .Pq mdoc
                   1118: The
                   1119: .Ic \&Ex Fl std
                   1120: macro is called without an argument before
                   1121: .Ic \&Nm
                   1122: has first been called with an argument.
1.146     schwarze 1123: .It Sy "missing function name, using \(dq\(dq"
                   1124: .Pq mdoc
                   1125: The
                   1126: .Ic \&Fo
                   1127: macro is called without an argument.
                   1128: No function name is printed.
1.106     schwarze 1129: .It Sy "empty head in list item"
                   1130: .Pq mdoc
                   1131: In a
                   1132: .Ic \&Bl
                   1133: .Fl diag ,
                   1134: .Fl hang ,
                   1135: .Fl inset ,
                   1136: .Fl ohang ,
                   1137: or
                   1138: .Fl tag
                   1139: list, an
                   1140: .Ic \&It
                   1141: macro lacks the required argument.
                   1142: The item head is left empty.
                   1143: .It Sy "empty list item"
                   1144: .Pq mdoc
                   1145: In a
                   1146: .Ic \&Bl
                   1147: .Fl bullet ,
                   1148: .Fl dash ,
                   1149: .Fl enum ,
                   1150: or
                   1151: .Fl hyphen
                   1152: list, an
                   1153: .Ic \&It
                   1154: block is empty.
                   1155: An empty list item is shown.
1.152     schwarze 1156: .It Sy "missing font type, using \efR"
1.106     schwarze 1157: .Pq mdoc
                   1158: A
                   1159: .Ic \&Bf
                   1160: macro has no argument.
1.152     schwarze 1161: It switches to the default font.
                   1162: .It Sy "unknown font type, using \efR"
1.106     schwarze 1163: .Pq mdoc
                   1164: The
                   1165: .Ic \&Bf
                   1166: argument is invalid.
1.152     schwarze 1167: The default font is used instead.
1.127     schwarze 1168: .It Sy "nothing follows prefix"
                   1169: .Pq mdoc
                   1170: A
                   1171: .Ic \&Pf
                   1172: macro has no argument, or only one argument and no macro follows
                   1173: on the same input line.
                   1174: This defeats its purpose; in particular, spacing is not suppressed
                   1175: before the text or macros following on the next input line.
1.143     schwarze 1176: .It Sy "empty reference block"
                   1177: .Pq mdoc
                   1178: An
                   1179: .Ic \&Rs
                   1180: macro is immediately followed by an
                   1181: .Ic \&Re
                   1182: macro on the next input line.
                   1183: Such an empty block does not produce any output.
1.165     schwarze 1184: .It Sy "missing section argument"
                   1185: .Pq mdoc
                   1186: An
                   1187: .Ic \&Xr
                   1188: macro lacks its second, section number argument.
                   1189: The first argument, i.e. the name, is printed, but without subsequent
1.166     schwarze 1190: parentheses.
1.106     schwarze 1191: .It Sy "missing -std argument, adding it"
                   1192: .Pq mdoc
                   1193: An
                   1194: .Ic \&Ex
                   1195: or
                   1196: .Ic \&Rv
                   1197: macro lacks the required
                   1198: .Fl std
                   1199: argument.
                   1200: The
                   1201: .Nm
                   1202: utility assumes
                   1203: .Fl std
                   1204: even when it is not specified, but other implementations may not.
1.150     schwarze 1205: .It Sy "missing option string, using \(dq\(dq"
                   1206: .Pq man
                   1207: The
                   1208: .Ic \&OP
                   1209: macro is invoked without any argument.
                   1210: An empty pair of square brackets is shown.
                   1211: .It Sy "missing resource identifier, using \(dq\(dq"
                   1212: .Pq man
                   1213: The
                   1214: .Ic \&UR
                   1215: macro is invoked without any argument.
                   1216: An empty pair of angle brackets is shown.
1.118     schwarze 1217: .It Sy "missing eqn box, using \(dq\(dq"
                   1218: .Pq eqn
                   1219: A diacritic mark or a binary operator is found,
                   1220: but there is nothing to the left of it.
                   1221: An empty box is inserted.
1.106     schwarze 1222: .El
                   1223: .Ss "Warnings related to bad macro arguments"
                   1224: .Bl -ohang
                   1225: .It Sy "unterminated quoted argument"
                   1226: .Pq roff
                   1227: Macro arguments can be enclosed in double quote characters
                   1228: such that space characters and macro names contained in the quoted
                   1229: argument need not be escaped.
                   1230: The closing quote of the last argument of a macro can be omitted.
                   1231: However, omitting it is not recommended because it makes the code
                   1232: harder to read.
                   1233: .It Sy "duplicate argument"
                   1234: .Pq mdoc
                   1235: A
                   1236: .Ic \&Bd
                   1237: or
                   1238: .Ic \&Bl
                   1239: macro has more than one
                   1240: .Fl compact ,
                   1241: more than one
                   1242: .Fl offset ,
                   1243: or more than one
                   1244: .Fl width
                   1245: argument.
                   1246: All but the last instances of these arguments are ignored.
                   1247: .It Sy "skipping duplicate argument"
                   1248: .Pq mdoc
                   1249: An
                   1250: .Ic \&An
                   1251: macro has more than one
                   1252: .Fl split
                   1253: or
                   1254: .Fl nosplit
                   1255: argument.
                   1256: All but the first of these arguments are ignored.
                   1257: .It Sy "skipping duplicate display type"
                   1258: .Pq mdoc
                   1259: A
                   1260: .Ic \&Bd
                   1261: macro has more than one type argument; the first one is used.
                   1262: .It Sy "skipping duplicate list type"
                   1263: .Pq mdoc
                   1264: A
                   1265: .Ic \&Bl
                   1266: macro has more than one type argument; the first one is used.
                   1267: .It Sy "skipping -width argument"
                   1268: .Pq mdoc
                   1269: A
                   1270: .Ic \&Bl
                   1271: .Fl column ,
                   1272: .Fl diag ,
                   1273: .Fl ohang ,
                   1274: .Fl inset ,
                   1275: or
                   1276: .Fl item
                   1277: list has a
                   1278: .Fl width
                   1279: argument.
                   1280: That has no effect.
1.151     schwarze 1281: .It Sy "wrong number of cells"
                   1282: In a line of a
                   1283: .Ic \&Bl Fl column
                   1284: list, the number of tabs or
                   1285: .Ic \&Ta
                   1286: macros is less than the number expected from the list header line
                   1287: or exceeds the expected number by more than one.
                   1288: Missing cells remain empty, and all cells exceeding the number of
                   1289: columns are joined into one single cell.
1.106     schwarze 1290: .It Sy "unknown AT&T UNIX version"
                   1291: .Pq mdoc
                   1292: An
                   1293: .Ic \&At
                   1294: macro has an invalid argument.
                   1295: It is used verbatim, with
                   1296: .Qq "AT&T UNIX "
                   1297: prefixed to it.
1.113     schwarze 1298: .It Sy "comma in function argument"
                   1299: .Pq mdoc
                   1300: An argument of an
                   1301: .Ic \&Fa
                   1302: or
                   1303: .Ic \&Fn
                   1304: macro contains a comma; it should probably be split into two arguments.
1.117     schwarze 1305: .It Sy "parenthesis in function name"
                   1306: .Pq mdoc
                   1307: The first argument of an
                   1308: .Ic \&Fc
                   1309: or
                   1310: .Ic \&Fn
                   1311: macro contains an opening or closing parenthesis; that's probably wrong,
                   1312: parentheses are added automatically.
1.106     schwarze 1313: .It Sy "invalid content in Rs block"
                   1314: .Pq mdoc
                   1315: An
                   1316: .Ic \&Rs
                   1317: block contains plain text or non-% macros.
                   1318: The bogus content is left in the syntax tree.
                   1319: Formatting may be poor.
                   1320: .It Sy "invalid Boolean argument"
                   1321: .Pq mdoc
                   1322: An
                   1323: .Ic \&Sm
                   1324: macro has an argument other than
                   1325: .Cm on
                   1326: or
                   1327: .Cm off .
                   1328: The invalid argument is moved out of the macro, which leaves the macro
                   1329: empty, causing it to toggle the spacing mode.
                   1330: .It Sy "unknown font, skipping request"
1.115     schwarze 1331: .Pq man , tbl
1.106     schwarze 1332: A
                   1333: .Xr roff 7
                   1334: .Ic \&ft
1.115     schwarze 1335: request or a
                   1336: .Xr tbl 7
                   1337: .Ic \&f
                   1338: layout modifier has an unknown
                   1339: .Ar font
                   1340: argument.
1.151     schwarze 1341: .It Sy "odd number of characters in request"
                   1342: .Pq roff
                   1343: A
                   1344: .Ic \&tr
                   1345: request contains an odd number of characters.
                   1346: The last character is mapped to the blank character.
1.106     schwarze 1347: .El
                   1348: .Ss "Warnings related to plain text"
                   1349: .Bl -ohang
                   1350: .It Sy "blank line in fill mode, using .sp"
                   1351: .Pq mdoc
                   1352: The meaning of blank input lines is only well-defined in non-fill mode:
                   1353: In fill mode, line breaks of text input lines are not supposed to be
                   1354: significant.
                   1355: However, for compatibility with groff, blank lines in fill mode
                   1356: are replaced with
                   1357: .Ic \&sp
                   1358: requests.
                   1359: .It Sy "tab in filled text"
                   1360: .Pq mdoc , man
                   1361: The meaning of tab characters is only well-defined in non-fill mode:
                   1362: In fill mode, whitespace is not supposed to be significant
                   1363: on text input lines.
                   1364: As an implementation dependent choice, tab characters on text lines
                   1365: are passed through to the formatters in any case.
                   1366: Given that the text before the tab character will be filled,
                   1367: it is hard to predict which tab stop position the tab will advance to.
                   1368: .It Sy "whitespace at end of input line"
                   1369: .Pq mdoc , man , roff
                   1370: Whitespace at the end of input lines is almost never semantically
                   1371: significant \(em but in the odd case where it might be, it is
                   1372: extremely confusing when reviewing and maintaining documents.
1.172     schwarze 1373: .It Sy "new sentence, new line"
                   1374: .Pq mdoc
                   1375: A new sentence starts in the middle of a text line.
                   1376: Start it on a new input line to help formatters produce correct spacing.
1.106     schwarze 1377: .It Sy "bad comment style"
                   1378: .Pq roff
                   1379: Comment lines start with a dot, a backslash, and a double-quote character.
                   1380: The
                   1381: .Nm
                   1382: utility treats the line as a comment line even without the backslash,
                   1383: but leaving out the backslash might not be portable.
                   1384: .It Sy "invalid escape sequence"
                   1385: .Pq roff
                   1386: An escape sequence has an invalid opening argument delimiter, lacks the
                   1387: closing argument delimiter, or the argument has too few characters.
                   1388: If the argument is incomplete,
                   1389: .Ic \e*
                   1390: and
                   1391: .Ic \en
                   1392: expand to an empty string,
                   1393: .Ic \eB
                   1394: to the digit
                   1395: .Sq 0 ,
                   1396: and
                   1397: .Ic \ew
                   1398: to the length of the incomplete argument.
                   1399: All other invalid escape sequences are ignored.
                   1400: .It Sy "undefined string, using \(dq\(dq"
                   1401: .Pq roff
                   1402: If a string is used without being defined before,
                   1403: its value is implicitly set to the empty string.
                   1404: However, defining strings explicitly before use
                   1405: keeps the code more readable.
                   1406: .El
1.138     schwarze 1407: .Ss "Warnings related to tables"
                   1408: .Bl -ohang
                   1409: .It Sy "tbl line starts with span"
                   1410: .Pq tbl
                   1411: The first cell in a table layout line is a horizontal span
                   1412: .Pq Sq Cm s .
                   1413: Data provided for this cell is ignored, and nothing is printed in the cell.
                   1414: .It Sy "tbl column starts with span"
                   1415: .Pq tbl
                   1416: The first line of a table layout specification
                   1417: requests a vertical span
                   1418: .Pq Sq Cm ^ .
                   1419: Data provided for this cell is ignored, and nothing is printed in the cell.
                   1420: .It Sy "skipping vertical bar in tbl layout"
                   1421: .Pq tbl
                   1422: A table layout specification contains more than two consecutive vertical bars.
                   1423: A double bar is printed, all additional bars are discarded.
1.106     schwarze 1424: .El
                   1425: .Ss "Errors related to tables"
1.136     schwarze 1426: .Bl -ohang
                   1427: .It Sy "non-alphabetic character in tbl options"
                   1428: .Pq tbl
                   1429: The table options line contains a character other than a letter,
                   1430: blank, or comma where the beginning of an option name is expected.
                   1431: The character is ignored.
                   1432: .It Sy "skipping unknown tbl option"
                   1433: .Pq tbl
                   1434: The table options line contains a string of letters that does not
                   1435: match any known option name.
                   1436: The word is ignored.
                   1437: .It Sy "missing tbl option argument"
                   1438: .Pq tbl
                   1439: A table option that requires an argument is not followed by an
                   1440: opening parenthesis, or the opening parenthesis is immediately
                   1441: followed by a closing parenthesis.
                   1442: The option is ignored.
                   1443: .It Sy "wrong tbl option argument size"
                   1444: .Pq tbl
                   1445: A table option argument contains an invalid number of characters.
                   1446: Both the option and the argument are ignored.
1.138     schwarze 1447: .It Sy "empty tbl layout"
                   1448: .Pq tbl
                   1449: A table layout specification is completely empty,
                   1450: specifying zero lines and zero columns.
                   1451: As a fallback, a single left-justified column is used.
                   1452: .It Sy "invalid character in tbl layout"
                   1453: .Pq tbl
                   1454: A table layout specification contains a character that can neither
                   1455: be interpreted as a layout key character nor as a layout modifier,
                   1456: or a modifier precedes the first key.
                   1457: The invalid character is discarded.
                   1458: .It Sy "unmatched parenthesis in tbl layout"
                   1459: .Pq tbl
                   1460: A table layout specification contains an opening parenthesis,
                   1461: but no matching closing parenthesis.
                   1462: The rest of the input line, starting from the parenthesis, has no effect.
1.139     schwarze 1463: .It Sy "tbl without any data cells"
                   1464: .Pq tbl
                   1465: A table does not contain any data cells.
                   1466: It will probably produce no output.
                   1467: .It Sy "ignoring data in spanned tbl cell"
                   1468: .Pq tbl
                   1469: A table cell is marked as a horizontal span
                   1470: .Pq Sq Cm s
                   1471: or vertical span
                   1472: .Pq Sq Cm ^
                   1473: in the table layout, but it contains data.
                   1474: The data is ignored.
                   1475: .It Sy "ignoring extra tbl data cells"
                   1476: .Pq tbl
                   1477: A data line contains more cells than the corresponding layout line.
                   1478: The data in the extra cells is ignored.
                   1479: .It Sy "data block open at end of tbl"
                   1480: .Pq tbl
                   1481: A data block is opened with
                   1482: .Cm T{ ,
                   1483: but never closed with a matching
                   1484: .Cm T} .
                   1485: The remaining data lines of the table are all put into one cell,
                   1486: and any remaining cells stay empty.
1.106     schwarze 1487: .El
                   1488: .Ss "Errors related to roff, mdoc, and man code"
                   1489: .Bl -ohang
                   1490: .It Sy "input stack limit exceeded, infinite loop?"
                   1491: .Pq roff
                   1492: Explicit recursion limits are implemented for the following features,
                   1493: in order to prevent infinite loops:
                   1494: .Bl -dash -compact
                   1495: .It
                   1496: expansion of nested escape sequences
                   1497: including expansion of strings and number registers,
                   1498: .It
                   1499: expansion of nested user-defined macros,
                   1500: .It
                   1501: and
                   1502: .Ic \&so
                   1503: file inclusion.
                   1504: .El
                   1505: When a limit is hit, the output is incorrect, typically losing
                   1506: some content, but the parser can continue.
                   1507: .It Sy "skipping bad character"
                   1508: .Pq mdoc , man , roff
                   1509: The input file contains a byte that is not a printable
                   1510: .Xr ascii 7
                   1511: character.
                   1512: The message mentions the character number.
                   1513: The offending byte is replaced with a question mark
                   1514: .Pq Sq \&? .
                   1515: Consider editing the input file to replace the byte with an ASCII
                   1516: transliteration of the intended character.
                   1517: .It Sy "skipping unknown macro"
                   1518: .Pq mdoc , man , roff
                   1519: The first identifier on a request or macro line is neither recognized as a
                   1520: .Xr roff 7
                   1521: request, nor as a user-defined macro, nor, respectively, as an
                   1522: .Xr mdoc 7
                   1523: or
                   1524: .Xr man 7
                   1525: macro.
                   1526: It may be mistyped or unsupported.
                   1527: The request or macro is discarded including its arguments.
1.133     schwarze 1528: .It Sy "skipping insecure request"
                   1529: .Pq roff
                   1530: An input file attempted to run a shell command
                   1531: or to read or write an external file.
                   1532: Such attempts are denied for security reasons.
1.106     schwarze 1533: .It Sy "skipping item outside list"
1.118     schwarze 1534: .Pq mdoc , eqn
1.106     schwarze 1535: An
                   1536: .Ic \&It
                   1537: macro occurs outside any
                   1538: .Ic \&Bl
1.118     schwarze 1539: list, or an
                   1540: .Xr eqn 7
                   1541: .Ic above
                   1542: delimiter occurs outside any pile.
1.106     schwarze 1543: It is discarded including its arguments.
                   1544: .It Sy "skipping column outside column list"
                   1545: .Pq mdoc
                   1546: A
                   1547: .Ic \&Ta
                   1548: macro occurs outside any
                   1549: .Ic \&Bl Fl column
                   1550: block.
                   1551: It is discarded including its arguments.
                   1552: .It Sy "skipping end of block that is not open"
                   1553: .Pq mdoc , man , eqn , tbl , roff
                   1554: Various syntax elements can only be used to explicitly close blocks
                   1555: that have previously been opened.
                   1556: An
                   1557: .Xr mdoc 7
                   1558: block closing macro, a
                   1559: .Xr man 7
                   1560: .Ic \&RE
                   1561: or
                   1562: .Ic \&UE
1.118     schwarze 1563: macro, an
                   1564: .Xr eqn 7
                   1565: right delimiter or closing brace, or the end of an equation, table, or
1.106     schwarze 1566: .Xr roff 7
                   1567: conditional request is encountered but no matching block is open.
                   1568: The offending request or macro is discarded.
1.135     schwarze 1569: .It Sy "fewer RS blocks open, skipping"
                   1570: .Pq man
                   1571: The
                   1572: .Ic \&RE
                   1573: macro is invoked with an argument, but less than the specified number of
                   1574: .Ic \&RS
                   1575: blocks is open.
                   1576: The
                   1577: .Ic \&RE
                   1578: macro is discarded.
1.106     schwarze 1579: .It Sy "inserting missing end of block"
                   1580: .Pq mdoc , tbl
                   1581: Various
                   1582: .Xr mdoc 7
                   1583: macros as well as tables require explicit closing by dedicated macros.
                   1584: A block that doesn't support bad nesting
                   1585: ends before all of its children are properly closed.
                   1586: The open child nodes are closed implicitly.
1.152     schwarze 1587: .It Sy "appending missing end of block"
1.106     schwarze 1588: .Pq mdoc , man , eqn , tbl , roff
                   1589: At the end of the document, an explicit
                   1590: .Xr mdoc 7
                   1591: block, a
                   1592: .Xr man 7
                   1593: next-line scope or
                   1594: .Ic \&RS
                   1595: or
                   1596: .Ic \&UR
                   1597: block, an equation, table, or
                   1598: .Xr roff 7
                   1599: conditional or ignore block is still open.
                   1600: The open block is closed implicitly.
                   1601: .It Sy "escaped character not allowed in a name"
                   1602: .Pq roff
                   1603: Macro, string and register identifiers consist of printable,
                   1604: non-whitespace ASCII characters.
                   1605: Escape sequences and characters and strings expressed in terms of them
                   1606: cannot form part of a name.
                   1607: The first argument of an
                   1608: .Ic \&am ,
                   1609: .Ic \&as ,
                   1610: .Ic \&de ,
                   1611: .Ic \&ds ,
                   1612: .Ic \&nr ,
                   1613: or
                   1614: .Ic \&rr
                   1615: request, or any argument of an
                   1616: .Ic \&rm
                   1617: request, or the name of a request or user defined macro being called,
                   1618: is terminated by an escape sequence.
                   1619: In the cases of
                   1620: .Ic \&as ,
                   1621: .Ic \&ds ,
                   1622: and
                   1623: .Ic \&nr ,
                   1624: the request has no effect at all.
                   1625: In the cases of
                   1626: .Ic \&am ,
                   1627: .Ic \&de ,
                   1628: .Ic \&rr ,
                   1629: and
                   1630: .Ic \&rm ,
                   1631: what was parsed up to this point is used as the arguments to the request,
                   1632: and the rest of the input line is discarded including the escape sequence.
                   1633: When parsing for a request or a user-defined macro name to be called,
                   1634: only the escape sequence is discarded.
                   1635: The characters preceding it are used as the request or macro name,
                   1636: the characters following it are used as the arguments to the request or macro.
1.124     schwarze 1637: .It Sy "NOT IMPLEMENTED: Bd -file"
                   1638: .Pq mdoc
                   1639: For security reasons, the
                   1640: .Ic \&Bd
                   1641: macro does not support the
                   1642: .Fl file
                   1643: argument.
                   1644: By requesting the inclusion of a sensitive file, a malicious document
                   1645: might otherwise trick a privileged user into inadvertently displaying
                   1646: the file on the screen, revealing the file content to bystanders.
                   1647: The argument is ignored including the file name following it.
1.163     schwarze 1648: .It Sy "skipping display without arguments"
                   1649: .Pq mdoc
                   1650: A
                   1651: .Ic \&Bd
                   1652: block macro does not have any arguments.
                   1653: The block is discarded, and the block content is displayed in
                   1654: whatever mode was active before the block.
1.106     schwarze 1655: .It Sy "missing list type, using -item"
                   1656: .Pq mdoc
                   1657: A
                   1658: .Ic \&Bl
                   1659: macro fails to specify the list type.
                   1660: .It Sy "missing manual name, using \(dq\(dq"
                   1661: .Pq mdoc
                   1662: The first call to
1.168     schwarze 1663: .Ic \&Nm ,
                   1664: or any call in the NAME section, lacks the required argument.
1.106     schwarze 1665: .It Sy "uname(3) system call failed, using UNKNOWN"
                   1666: .Pq mdoc
                   1667: The
                   1668: .Ic \&Os
                   1669: macro is called without arguments, and the
                   1670: .Xr uname 3
                   1671: system call failed.
                   1672: As a workaround,
                   1673: .Nm
                   1674: can be compiled with
                   1675: .Sm off
                   1676: .Fl D Cm OSNAME=\(dq\e\(dq Ar string Cm \e\(dq\(dq .
                   1677: .Sm on
                   1678: .It Sy "unknown standard specifier"
                   1679: .Pq mdoc
                   1680: An
                   1681: .Ic \&St
                   1682: macro has an unknown argument and is discarded.
                   1683: .It Sy "skipping request without numeric argument"
1.118     schwarze 1684: .Pq roff , eqn
1.106     schwarze 1685: An
                   1686: .Ic \&it
1.118     schwarze 1687: request or an
                   1688: .Xr eqn 7
                   1689: .Ic \&size
                   1690: or
                   1691: .Ic \&gsize
                   1692: statement has a non-numeric or negative argument or no argument at all.
                   1693: The invalid request or statement is ignored.
1.132     schwarze 1694: .It Sy "NOT IMPLEMENTED: .so with absolute path or \(dq..\(dq"
                   1695: .Pq roff
                   1696: For security reasons,
                   1697: .Nm
                   1698: allows
                   1699: .Ic \&so
                   1700: file inclusion requests only with relative paths
                   1701: and only without ascending to any parent directory.
                   1702: By requesting the inclusion of a sensitive file, a malicious document
                   1703: might otherwise trick a privileged user into inadvertently displaying
                   1704: the file on the screen, revealing the file content to bystanders.
                   1705: .Nm
                   1706: only shows the path as it appears behind
                   1707: .Ic \&so .
                   1708: .It Sy ".so request failed"
                   1709: .Pq roff
                   1710: Servicing a
                   1711: .Ic \&so
                   1712: request requires reading an external file, but the file could not be
                   1713: opened.
                   1714: .Nm
                   1715: only shows the path as it appears behind
                   1716: .Ic \&so .
1.106     schwarze 1717: .It Sy "skipping all arguments"
                   1718: .Pq mdoc , man , eqn , roff
                   1719: An
                   1720: .Xr mdoc 7
                   1721: .Ic \&Bt ,
                   1722: .Ic \&Ed ,
                   1723: .Ic \&Ef ,
                   1724: .Ic \&Ek ,
                   1725: .Ic \&El ,
1.144     schwarze 1726: .Ic \&Lp ,
                   1727: .Ic \&Pp ,
1.106     schwarze 1728: .Ic \&Re ,
1.143     schwarze 1729: .Ic \&Rs ,
1.106     schwarze 1730: or
                   1731: .Ic \&Ud
                   1732: macro, an
                   1733: .Ic \&It
                   1734: macro in a list that don't support item heads, a
                   1735: .Xr man 7
                   1736: .Ic \&LP ,
                   1737: .Ic \&P ,
                   1738: or
                   1739: .Ic \&PP
                   1740: macro, an
                   1741: .Xr eqn 7
1.120     schwarze 1742: .Ic \&EQ
                   1743: or
1.106     schwarze 1744: .Ic \&EN
                   1745: macro, or a
                   1746: .Xr roff 7
1.148     schwarze 1747: .Ic \&br ,
                   1748: .Ic \&fi ,
                   1749: or
                   1750: .Ic \&nf
1.144     schwarze 1751: request or
1.106     schwarze 1752: .Sq \&..
                   1753: block closing request is invoked with at least one argument.
                   1754: All arguments are ignored.
                   1755: .It Sy "skipping excess arguments"
1.135     schwarze 1756: .Pq mdoc , man , roff
1.150     schwarze 1757: A macro or request is invoked with too many arguments:
                   1758: .Bl -dash -offset 2n -width 2n -compact
                   1759: .It
                   1760: .Ic \&Fo ,
                   1761: .Ic \&PD ,
                   1762: .Ic \&RS ,
                   1763: .Ic \&UR ,
                   1764: .Ic \&ft ,
                   1765: or
                   1766: .Ic \&sp
                   1767: with more than one argument
                   1768: .It
1.144     schwarze 1769: .Ic \&An
1.150     schwarze 1770: with another argument after
1.144     schwarze 1771: .Fl split
                   1772: or
1.150     schwarze 1773: .Fl nosplit
                   1774: .It
                   1775: .Ic \&RE
                   1776: with more than one argument or with a non-integer argument
                   1777: .It
                   1778: .Ic \&OP
                   1779: or a request of the
                   1780: .Ic \&de
                   1781: family with more than two arguments
1.154     schwarze 1782: .It
                   1783: .Ic \&Dt
                   1784: with more than three arguments
1.150     schwarze 1785: .It
                   1786: .Ic \&TH
                   1787: with more than five arguments
                   1788: .It
1.145     schwarze 1789: .Ic \&Bd ,
                   1790: .Ic \&Bk ,
                   1791: or
                   1792: .Ic \&Bl
1.150     schwarze 1793: with invalid arguments
                   1794: .El
1.106     schwarze 1795: The excess arguments are ignored.
1.133     schwarze 1796: .El
                   1797: .Ss Unsupported features
                   1798: .Bl -ohang
                   1799: .It Sy "input too large"
                   1800: .Pq mdoc , man
                   1801: Currently,
                   1802: .Nm
                   1803: cannot handle input files larger than its arbitrary size limit
                   1804: of 2^31 bytes (2 Gigabytes).
                   1805: Since useful manuals are always small, this is not a problem in practice.
                   1806: Parsing is aborted as soon as the condition is detected.
1.136     schwarze 1807: .It Sy "unsupported control character"
                   1808: .Pq roff
                   1809: An ASCII control character supported by other
                   1810: .Xr roff 7
                   1811: implementations but not by
                   1812: .Nm
                   1813: was found in an input file.
                   1814: It is replaced by a question mark.
1.133     schwarze 1815: .It Sy "unsupported roff request"
                   1816: .Pq roff
                   1817: An input file contains a
                   1818: .Xr roff 7
                   1819: request supported by GNU troff or Heirloom troff but not by
                   1820: .Nm ,
                   1821: and it is likely that this will cause information loss
                   1822: or considerable misformatting.
1.139     schwarze 1823: .It Sy "eqn delim option in tbl"
                   1824: .Pq eqn , tbl
                   1825: The options line of a table defines equation delimiters.
                   1826: Any equation source code contained in the table will be printed unformatted.
                   1827: .It Sy "unsupported table layout modifier"
1.138     schwarze 1828: .Pq tbl
                   1829: A table layout specification contains an
                   1830: .Sq Cm m
                   1831: modifier.
                   1832: The modifier is discarded.
1.133     schwarze 1833: .It Sy "ignoring macro in table"
1.139     schwarze 1834: .Pq tbl , mdoc , man
                   1835: A table contains an invocation of an
                   1836: .Xr mdoc 7
                   1837: or
                   1838: .Xr man 7
                   1839: macro or of an undefined macro.
                   1840: The macro is ignored, and its arguments are handled
                   1841: as if they were a text line.
1.106     schwarze 1842: .El
1.1       kristaps 1843: .Sh SEE ALSO
1.141     schwarze 1844: .Xr apropos 1 ,
                   1845: .Xr man 1 ,
1.85      kristaps 1846: .Xr eqn 7 ,
1.57      kristaps 1847: .Xr man 7 ,
1.13      kristaps 1848: .Xr mandoc_char 7 ,
1.84      kristaps 1849: .Xr mdoc 7 ,
                   1850: .Xr roff 7 ,
                   1851: .Xr tbl 7
1.173     schwarze 1852: .Sh HISTORY
                   1853: The
                   1854: .Nm
                   1855: utility first appeared in
                   1856: .Ox 4.8 .
                   1857: The option
                   1858: .Fl I
                   1859: appeared in
                   1860: .Ox 5.2 ,
                   1861: and
                   1862: .Fl aCcfhKklMSsw
                   1863: in
                   1864: .Ox 5.7 .
1.1       kristaps 1865: .Sh AUTHORS
1.156     schwarze 1866: .An -nosplit
1.1       kristaps 1867: The
                   1868: .Nm
1.26      kristaps 1869: utility was written by
1.141     schwarze 1870: .An Kristaps Dzonsons Aq Mt kristaps@bsd.lv
                   1871: and is maintained by
                   1872: .An Ingo Schwarze Aq Mt schwarze@openbsd.org .

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