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version 1.77, 2010/07/19 10:48:36 version 1.97, 2011/01/25 00:40:14
Line 1 
Line 1 
 .\"     $Id$  .\"     $Id$
 .\"  .\"
 .\" Copyright (c) 2009 Kristaps Dzonsons <kristaps@bsd.lv>  .\" Copyright (c) 2009, 2010 Kristaps Dzonsons <kristaps@bsd.lv>
 .\"  .\"
 .\" Permission to use, copy, modify, and distribute this software for any  .\" Permission to use, copy, modify, and distribute this software for any
 .\" purpose with or without fee is hereby granted, provided that the above  .\" purpose with or without fee is hereby granted, provided that the above
Line 37  Use the
Line 37  Use the
 .Xr mdoc 7  .Xr mdoc 7
 language, instead.  language, instead.
 .Pp  .Pp
 An  A
 .Nm  .Nm
 document follows simple rules:  lines beginning with the control  document follows simple rules:  lines beginning with the control
 character  character
Line 52  Other lines are interpreted within the current state.
Line 52  Other lines are interpreted within the current state.
 .Sh INPUT ENCODING  .Sh INPUT ENCODING
 .Nm  .Nm
 documents may contain only graphable 7-bit ASCII characters, the  documents may contain only graphable 7-bit ASCII characters, the
 space character, and the tabs character.  space character, and the tab character.
 All manuals must have  
 .Ux  
 line termination.  
 .Pp  .Pp
 Blank lines are acceptable; where found, the output will assert a  Blank lines are acceptable; where found, the output will assert a
 vertical space.  vertical space.
   .Pp
   If the first character of a line is a space, that line is printed
   with a leading newline.
 .Ss Comments  .Ss Comments
 Text following a  Text following a
 .Sq \e\*q ,  .Sq \e\*q ,
Line 92  and
Line 92  and
 .Ss Text Decoration  .Ss Text Decoration
 Terms may be text-decorated using the  Terms may be text-decorated using the
 .Sq \ef  .Sq \ef
 escape followed by an indicator: B (bold), I, (italic), R (Roman), or P  escape followed by an indicator: B (bold), I (italic), R (Roman), or P
 (revert to previous mode):  (revert to previous mode):
 .Pp  .Pp
 .D1 \efBbold\efR \efIitalic\efP  .D1 \efBbold\efR \efIitalic\efP
Line 111  The
Line 111  The
 attribute is forgotten when entering or exiting a macro block.  attribute is forgotten when entering or exiting a macro block.
 .Ss Whitespace  .Ss Whitespace
 Whitespace consists of the space character.  Whitespace consists of the space character.
 In free-form lines, whitespace is preserved within a line; un-escaped  In free-form lines, whitespace is preserved within a line; unescaped
 trailing spaces are stripped from input (unless in a literal context).  trailing spaces are stripped from input (unless in a literal context).
 Blank free-form lines, which may include spaces, are permitted and  Blank free-form lines, which may include spaces, are permitted and
 rendered as an empty line.  rendered as an empty line.
Line 190  this differs from
Line 190  this differs from
 which, if a unit is not provided, will instead interpret the string as  which, if a unit is not provided, will instead interpret the string as
 literal text.  literal text.
 .Ss Sentence Spacing  .Ss Sentence Spacing
 When composing a manual, make sure that your sentences end at the end of  When composing a manual, make sure that sentences end at the end of
 a line.  a line.
 By doing so, front-ends will be able to apply the proper amount of  By doing so, front-ends will be able to apply the proper amount of
 spacing after the end of sentence (unescaped) period, exclamation mark,  spacing after the end of sentence (unescaped) period, exclamation mark,
 or question mark followed by zero or more non-sentence closing  or question mark followed by zero or more non-sentence closing
 delimiters (  delimiters
 .Ns Sq \&) ,  .Po
   .Sq \&) ,
 .Sq \&] ,  .Sq \&] ,
 .Sq \&' ,  .Sq \&' ,
 .Sq \&" ) .  .Sq \&"
   .Pc .
 .Sh MANUAL STRUCTURE  .Sh MANUAL STRUCTURE
 Each  Each
 .Nm  .Nm
 document must contain contains at least the  document must contain the
 .Sx \&TH  .Sx \&TH
 macro describing the document's section and title.  macro describing the document's section and title.
 It may occur anywhere in the document, although conventionally, it  It may occur anywhere in the document, although conventionally it
 appears as the first macro.  appears as the first macro.
 .Pp  .Pp
 Beyond  Beyond
Line 217  Documents are generally structured as follows:
Line 219  Documents are generally structured as follows:
 \&.TH FOO 1 2009-10-10  \&.TH FOO 1 2009-10-10
 \&.SH NAME  \&.SH NAME
 \efBfoo\efR \e(en a description goes here  \efBfoo\efR \e(en a description goes here
 \&.\e\*q The next is for sections 2 & 3 only.  
 \&.\e\*q .SH LIBRARY  \&.\e\*q .SH LIBRARY
   \&.\e\*q For sections 2 & 3 only.
   \&.\e\*q Not used in OpenBSD.
 \&.SH SYNOPSIS  \&.SH SYNOPSIS
 \efBfoo\efR [\efB\e-options\efR] arguments...  \efBfoo\efR [\efB\e-options\efR] arguments...
 \&.SH DESCRIPTION  \&.SH DESCRIPTION
 The \efBfoo\efR utility processes files...  The \efBfoo\efR utility processes files...
 \&.\e\*q .SH IMPLEMENTATION NOTES  \&.\e\*q .SH IMPLEMENTATION NOTES
 \&.\e\*q The next is for sections 2, 3, & 9 only.  \&.\e\*q Not used in OpenBSD.
 \&.\e\*q .SH RETURN VALUES  \&.\e\*q .SH RETURN VALUES
 \&.\e\*q The next is for sections 1, 6, 7, & 8 only.  \&.\e\*q For sections 2, 3, & 9 only.
 \&.\e\*q .SH ENVIRONMENT  \&.\e\*q .SH ENVIRONMENT
   \&.\e\*q For sections 1, 6, 7, & 8 only.
 \&.\e\*q .SH FILES  \&.\e\*q .SH FILES
 \&.\e\*q The next is for sections 1 & 8 only.  
 \&.\e\*q .SH EXIT STATUS  \&.\e\*q .SH EXIT STATUS
   \&.\e\*q For sections 1, 6, & 8 only.
 \&.\e\*q .SH EXAMPLES  \&.\e\*q .SH EXAMPLES
 \&.\e\*q The next is for sections 1, 4, 6, 7, & 8 only.  
 \&.\e\*q .SH DIAGNOSTICS  \&.\e\*q .SH DIAGNOSTICS
 \&.\e\*q The next is for sections 2, 3, & 9 only.  \&.\e\*q For sections 1, 4, 6, 7, & 8 only.
 \&.\e\*q .SH ERRORS  \&.\e\*q .SH ERRORS
   \&.\e\*q For sections 2, 3, & 9 only.
 \&.\e\*q .SH SEE ALSO  \&.\e\*q .SH SEE ALSO
 \&.\e\*q .BR foo ( 1 )  \&.\e\*q .BR foo ( 1 )
 \&.\e\*q .SH STANDARDS  \&.\e\*q .SH STANDARDS
Line 244  The \efBfoo\efR utility processes files...
Line 248  The \efBfoo\efR utility processes files...
 \&.\e\*q .SH CAVEATS  \&.\e\*q .SH CAVEATS
 \&.\e\*q .SH BUGS  \&.\e\*q .SH BUGS
 \&.\e\*q .SH SECURITY CONSIDERATIONS  \&.\e\*q .SH SECURITY CONSIDERATIONS
   \&.\e\*q Not used in OpenBSD.
 .Ed  .Ed
 .Pp  .Pp
 The sections in a  The sections in a
Line 291  Implementation-specific notes should be kept here.
Line 296  Implementation-specific notes should be kept here.
 This is useful when implementing standard functions that may have side  This is useful when implementing standard functions that may have side
 effects or notable algorithmic implications.  effects or notable algorithmic implications.
 .It Em RETURN VALUES  .It Em RETURN VALUES
 This section is the dual of  This section documents the return values of functions in sections 2, 3, and 9.
 .Em EXIT STATUS ,  
 which is used for commands.  
 It documents the return values of functions in sections 2, 3, and 9.  
 .It Em ENVIRONMENT  .It Em ENVIRONMENT
 Documents any usages of environment variables, e.g.,  Documents any usages of environment variables, e.g.,
 .Xr environ 7 .  .Xr environ 7 .
 .It Em FILES  .It Em FILES
 Documents files used.  Documents files used.
 It's helpful to document both the file and a short description of how  It's helpful to document both the file name and a short description of how
 the file is used (created, modified, etc.).  the file is used (created, modified, etc.).
 .It Em EXIT STATUS  .It Em EXIT STATUS
 Command exit status for section 1, 6, and 8 manuals.  This section documents the command exit status for
 This section is the dual of  section 1, 6, and 8 utilities.
 .Em RETURN VALUES ,  
 which is used for functions.  
 Historically, this information was described in  Historically, this information was described in
 .Em DIAGNOSTICS ,  .Em DIAGNOSTICS ,
 a practise that is now discouraged.  a practise that is now discouraged.
Line 314  a practise that is now discouraged.
Line 314  a practise that is now discouraged.
 Example usages.  Example usages.
 This often contains snippets of well-formed,  This often contains snippets of well-formed,
 well-tested invocations.  well-tested invocations.
 Make doubly sure that your examples work properly!  Make sure that examples work properly!
 .It Em DIAGNOSTICS  .It Em DIAGNOSTICS
 Documents error conditions.  Documents error conditions.
 This is most useful in section 4 manuals.  This is most useful in section 4 manuals.
Line 341  If not adhering to any standards, the
Line 341  If not adhering to any standards, the
 .Em HISTORY  .Em HISTORY
 section should be used.  section should be used.
 .It Em HISTORY  .It Em HISTORY
 The history of any manual without a  A brief history of the subject, including where support first appeared.
 .Em STANDARDS  
 section should be described in this section.  
 .It Em AUTHORS  .It Em AUTHORS
 Credits to authors, if applicable, should appear in this section.  Credits to the person or persons who wrote the code and/or documentation.
 Authors should generally be noted by both name and an e-mail address.  Authors should generally be noted by both name and email address.
 .It Em CAVEATS  .It Em CAVEATS
 Explanations of common misuses and misunderstandings should be explained  Common misuses and misunderstandings should be explained
 in this section.  in this section.
 .It Em BUGS  .It Em BUGS
 Extant bugs should be described in this section.  Known bugs, limitations, and work-arounds should be described
   in this section.
 .It Em SECURITY CONSIDERATIONS  .It Em SECURITY CONSIDERATIONS
 Documents any security precautions that operators should consider.  Documents any security precautions that operators should consider.
 .El  .El
 .Sh MACRO SYNTAX  .Sh MACRO SYNTAX
 Macros are one to three three characters in length and begin with a  Macros are one to three characters in length and begin with a
 control character ,  control character,
 .Sq \&. ,  .Sq \&. ,
 at the beginning of the line.  at the beginning of the line.
 The  The
Line 371  Thus, the following are equivalent:
Line 370  Thus, the following are equivalent:
 \&.\ \ \ PP  \&.\ \ \ PP
 .Ed  .Ed
 .Pp  .Pp
   To include space characters in macro arguments, arguments may be quoted;
   see the
   .Sq MACRO SYNTAX
   section in the
   .Xr roff 7
   manual for details.
   .Pp
 The  The
 .Nm  .Nm
 macros are classified by scope: line scope or block scope.  macros are classified by scope: line scope or block scope.
Line 393  is equivalent to
Line 399  is equivalent to
 .Sq \&.I foo .  .Sq \&.I foo .
 If next-line macros are invoked consecutively, only the last is used.  If next-line macros are invoked consecutively, only the last is used.
 If a next-line macro is followed by a non-next-line macro, an error is  If a next-line macro is followed by a non-next-line macro, an error is
 raised (unless in the case of  raised, except for
 .Sx \&br ,  .Sx \&br ,
 .Sx \&sp ,  .Sx \&sp ,
 or  and
 .Sx \&na ) .  .Sx \&na .
 .Pp  .Pp
 The syntax is as follows:  The syntax is as follows:
 .Bd -literal -offset indent  .Bd -literal -offset indent
Line 415  The syntax is as follows:
Line 421  The syntax is as follows:
 .It Sx \&I   Ta    n         Ta    next-line Ta    \&  .It Sx \&I   Ta    n         Ta    next-line Ta    \&
 .It Sx \&IB  Ta    n         Ta    current   Ta    \&  .It Sx \&IB  Ta    n         Ta    current   Ta    \&
 .It Sx \&IR  Ta    n         Ta    current   Ta    \&  .It Sx \&IR  Ta    n         Ta    current   Ta    \&
 .\" .It Sx \&PD  Ta    n         Ta    current   Ta    compat  
 .It Sx \&R   Ta    n         Ta    next-line Ta    \&  .It Sx \&R   Ta    n         Ta    next-line Ta    \&
 .It Sx \&RB  Ta    n         Ta    current   Ta    \&  .It Sx \&RB  Ta    n         Ta    current   Ta    \&
 .It Sx \&RI  Ta    n         Ta    current   Ta    \&  .It Sx \&RI  Ta    n         Ta    current   Ta    \&
Line 425  The syntax is as follows:
Line 430  The syntax is as follows:
 .It Sx \&UC  Ta    <=1       Ta    current   Ta    \&  .It Sx \&UC  Ta    <=1       Ta    current   Ta    \&
 .It Sx \&br  Ta    0         Ta    current   Ta    compat  .It Sx \&br  Ta    0         Ta    current   Ta    compat
 .It Sx \&fi  Ta    0         Ta    current   Ta    compat  .It Sx \&fi  Ta    0         Ta    current   Ta    compat
 .It Sx \&i   Ta    n         Ta    current   Ta    compat  .It Sx \&ft  Ta    1         Ta    current   Ta    compat
   .It Sx \&in  Ta    1         Ta    current   Ta    compat
 .It Sx \&na  Ta    0         Ta    current   Ta    compat  .It Sx \&na  Ta    0         Ta    current   Ta    compat
 .It Sx \&nf  Ta    0         Ta    current   Ta    compat  .It Sx \&nf  Ta    0         Ta    current   Ta    compat
 .It Sx \&r   Ta    0         Ta    current   Ta    compat  
 .It Sx \&sp  Ta    1         Ta    current   Ta    compat  .It Sx \&sp  Ta    1         Ta    current   Ta    compat
 .\" .It Sx \&Sp  Ta    <1        Ta    current   Ta    compat  
 .\" .It Sx \&Vb  Ta    <1        Ta    current   Ta    compat  
 .\" .It Sx \&Ve  Ta    0         Ta    current   Ta    compat  
 .El  .El
 .Pp  .Pp
 Macros marked as  Macros marked as
Line 443  These macros should not be used for portable
Line 445  These macros should not be used for portable
 .Nm  .Nm
 manuals.  manuals.
 .Ss Block Macros  .Ss Block Macros
 Block macros are comprised of a head and body.  Block macros comprise a head and body.
 Like for in-line macros, the head is scoped to the current line and, in  As with in-line macros, the head is scoped to the current line and, in
 one circumstance, the next line (the next-line stipulations as in  one circumstance, the next line (the next-line stipulations as in
 .Sx Line Macros  .Sx Line Macros
 apply here as well).  apply here as well).
Line 512  The optional arguments specify which release it is fro
Line 514  The optional arguments specify which release it is fro
 Text is rendered in bold face.  Text is rendered in bold face.
 .Pp  .Pp
 See also  See also
 .Sx \&I ,  .Sx \&I
 .Sx \&R ,  
 .Sx \&b ,  
 .Sx \&i ,  
 and  and
 .Sx \&r .  .Sx \&R .
 .Ss \&BI  .Ss \&BI
 Text is rendered alternately in bold face and italic.  Text is rendered alternately in bold face and italic.
 Thus,  Thus,
Line 535  Whitespace between arguments is omitted in output.
Line 534  Whitespace between arguments is omitted in output.
 .Pp  .Pp
 Examples:  Examples:
 .Pp  .Pp
 .D1 \&.BI bold italic bold italic  .Dl \&.BI bold italic bold italic
 .Pp  .Pp
 The output of this example will be emboldened  The output of this example will be emboldened
 .Dq bold  .Dq bold
Line 594  and
Line 593  and
 Text is rendered in italics.  Text is rendered in italics.
 .Pp  .Pp
 See also  See also
 .Sx \&B ,  .Sx \&B
 .Sx \&R ,  
 .Sx \&b ,  
 .Sx \&i ,  
 and  and
 .Sx \&r .  .Sx \&R .
 .Ss \&IB  .Ss \&IB
 Text is rendered alternately in italics and bold face.  Whitespace  Text is rendered alternately in italics and bold face.
 between arguments is omitted in output.  Whitespace between arguments is omitted in output.
 .Pp  .Pp
 See  See
 .Sx \&BI  .Sx \&BI
Line 625  Begin an indented paragraph with the following syntax:
Line 621  Begin an indented paragraph with the following syntax:
 The  The
 .Cm width  .Cm width
 argument defines the width of the left margin and is defined by  argument defines the width of the left margin and is defined by
 .Sx Scaling Widths ,  .Sx Scaling Widths .
 It's saved for later paragraph left-margins; if unspecified, the saved or  It's saved for later paragraph left-margins; if unspecified, the saved or
 default width is used.  default width is used.
 .Pp  .Pp
Line 660  and
Line 656  and
 Begin an undecorated paragraph.  Begin an undecorated paragraph.
 The scope of a paragraph is closed by a subsequent paragraph,  The scope of a paragraph is closed by a subsequent paragraph,
 sub-section, section, or end of file.  sub-section, section, or end of file.
 The saved paragraph left-margin width is re-set to the default.  The saved paragraph left-margin width is reset to the default.
 .Pp  .Pp
 See also  See also
 .Sx \&HP ,  .Sx \&HP ,
Line 695  and
Line 691  and
 Text is rendered in roman (the default font).  Text is rendered in roman (the default font).
 .Pp  .Pp
 See also  See also
 .Sx \&I ,  .Sx \&I
 .Sx \&B ,  
 .Sx \&b ,  
 .Sx \&i ,  
 and  and
 .Sx \&r .  .Sx \&B .
 .Ss \&RB  .Ss \&RB
 Text is rendered alternately in roman (the default font) and bold face.  Text is rendered alternately in roman (the default font) and bold face.
 Whitespace between arguments is omitted in output.  Whitespace between arguments is omitted in output.
Line 757  bold face.
Line 750  bold face.
 Begin a section.  Begin a section.
 The scope of a section is only closed by another section or the end of  The scope of a section is only closed by another section or the end of
 file.  file.
 The paragraph left-margin width is re-set to the default.  The paragraph left-margin width is reset to the default.
 .Ss \&SM  .Ss \&SM
 Text is rendered in small size (one point smaller than the default  Text is rendered in small size (one point smaller than the default
 font).  font).
Line 765  font).
Line 758  font).
 Begin a sub-section.  Begin a sub-section.
 The scope of a sub-section is closed by a subsequent sub-section,  The scope of a sub-section is closed by a subsequent sub-section,
 section, or end of file.  section, or end of file.
 The paragraph left-margin width is re-set to the default.  The paragraph left-margin width is reset to the default.
 .Ss \&TH  .Ss \&TH
 Sets the title of the manual page with the following syntax:  Sets the title of the manual page with the following syntax:
 .Bd -filled -offset indent  .Bd -filled -offset indent
Line 774  Sets the title of the manual page with the following s
Line 767  Sets the title of the manual page with the following s
 .Op Cm date Op Cm source Op Cm volume  .Op Cm date Op Cm source Op Cm volume
 .Ed  .Ed
 .Pp  .Pp
 At least the upper-case document title  At least the upper-case document
 .Cm title  .Cm title
 and numeric manual section  and the manual
 .Cm section  .Cm section
 arguments must be provided.  arguments must be provided.
 The  The
Line 795  manual section.
Line 788  manual section.
 .Pp  .Pp
 Examples:  Examples:
 .Pp  .Pp
 .D1 \&.TH CVS 5 "1992-02-12" GNU  .Dl \&.TH CVS 5 "1992-02-12" GNU
 .Ss \&TP  .Ss \&TP
 Begin a paragraph where the head, if exceeding the indentation width, is  Begin a paragraph where the head, if exceeding the indentation width, is
 followed by a newline; if not, the body follows on the same line after a  followed by a newline; if not, the body follows on the same line after a
Line 821  See also
Line 814  See also
 .Sx \&P ,  .Sx \&P ,
 and  and
 .Sx \&PP .  .Sx \&PP .
 .\" .  
 .\" .  
 .\" .Ss \&PD  
 .\" Has no effect.  Included for compatibility.  
 .\" .  
 .\" .  
 .Ss \&UC  .Ss \&UC
 Sets the volume for the footer for compatibility with man pages from  Sets the volume for the footer for compatibility with man pages from
 BSD releases.  BSD releases.
Line 840  See also
Line 827  See also
 .Ss \&fi  .Ss \&fi
 End literal mode begun by  End literal mode begun by
 .Sx \&nf .  .Sx \&nf .
 .Ss \&i  .Ss \&ft
 Italicise arguments.  Change the current font mode.
 Synonym for  See
 .Sx \&I .  .Sx Text Decoration
   for a listing of available font modes.
   .Ss \&in
   Indent relative to the current indentation:
 .Pp  .Pp
 See also  .D1 Pf \. Sx \&in Op Cm width
 .Sx \&B ,  .Pp
 .Sx \&I ,  If
 .Sx \&R .  .Cm width
 .Sx \&b ,  is signed, the new offset is relative.
 and  Otherwise, it is absolute.
 .Sx \&r .  This value is reset upon the next paragraph, section, or sub-section.
 .Ss \&na  .Ss \&na
 Don't align to the right margin.  Don't align to the right margin.
 .Ss \&nf  .Ss \&nf
Line 859  Begin literal mode: all subsequent free-form lines hav
Line 849  Begin literal mode: all subsequent free-form lines hav
 line boundaries preserved.  line boundaries preserved.
 May be ended by  May be ended by
 .Sx \&fi .  .Sx \&fi .
 .Ss \&r  
 Fonts and styles (bold face, italics) reset to roman (default font).  
 .Pp  
 See also  
 .Sx \&B ,  
 .Sx \&I ,  
 .Sx \&R ,  
 .Sx \&b ,  
 and  
 .Sx \&i .  
 .Ss \&sp  .Ss \&sp
 Insert vertical spaces into output with the following syntax:  Insert vertical spaces into output with the following syntax:
 .Bd -filled -offset indent  .Bd -filled -offset indent
Line 887  Defaults to 1, if unspecified.
Line 867  Defaults to 1, if unspecified.
 .Pp  .Pp
 See also  See also
 .Sx \&br .  .Sx \&br .
 .\" .Ss \&Sp  
 .\" A synonym for  
 .\" .Sx \&sp  
 .\" .Cm 0.5v .  
 .\" .  
 .\" .Ss \&Vb  
 .\" A synonym for  
 .\" .Sx \&nf .  
 .\" Accepts an argument (the height of the formatted space) which is  
 .\" disregarded.  
 .\" .  
 .\" .Ss \&Ve  
 .\" A synonym for  
 .\" .Sx \&fi .  
 .\" .  
 .Sh COMPATIBILITY  .Sh COMPATIBILITY
 This section documents areas of questionable portability between  This section documents areas of questionable portability between
 implementations of the  implementations of the
Line 910  language.
Line 875  language.
 .Pp  .Pp
 .Bl -dash -compact  .Bl -dash -compact
 .It  .It
 The \es (font size), \em (font colour), and \eM (font filling colour)  
 font decoration escapes are all discarded in mandoc.  
 .It  
 In quoted literals, GNU troff allowed pair-wise double-quotes to produce  In quoted literals, GNU troff allowed pair-wise double-quotes to produce
 a standalone double-quote in formatted output.  a standalone double-quote in formatted output.
 It is not known whether this behaviour is exhibited by other formatters.  It is not known whether this behaviour is exhibited by other formatters.
 .It  .It
   troff suppresses a newline before
   .Sq \(aq
   macro output; in mandoc, it is an alias for the standard
   .Sq \&.
   control character.
   .It
 The  The
   .Sq \eh
   .Pq horizontal position ,
   .Sq \ev
   .Pq vertical position ,
   .Sq \em
   .Pq text colour ,
   .Sq \eM
   .Pq text filling colour ,
   .Sq \ez
   .Pq zero-length character ,
   .Sq \ew
   .Pq string length ,
   .Sq \ek
   .Pq horizontal position marker ,
   .Sq \eo
   .Pq text overstrike ,
   and
   .Sq \es
   .Pq text size
   escape sequences are all discarded in mandoc.
   .It
   The
   .Sq \ef
   scaling unit is accepted by mandoc, but rendered as the default unit.
   .It
   The
 .Sx \&sp  .Sx \&sp
 macro does not accept negative values in mandoc.  macro does not accept negative values in mandoc.
 In GNU troff, this would result in strange behaviour.  In GNU troff, this would result in strange behaviour.
 .It  
 The  
 .Sq \(aq  
 macro control character, in GNU troff (and prior troffs) suppresses a  
 newline before macro output; in mandoc, it is an alias for the standard  
 .Sq \&.  
 control character.  
 .El  .El
 .Sh SEE ALSO  .Sh SEE ALSO
   .Xr man 1 ,
 .Xr mandoc 1 ,  .Xr mandoc 1 ,
 .Xr mandoc_char 7  .Xr mandoc_char 7 ,
 .Sh AUTHORS  .Xr mdoc 7 ,
   .Xr roff 7 ,
   .Xr tbl 7
   .Sh HISTORY
 The  The
   .Nm
   language first appeared as a macro package for the roff typesetting
   system in
   .At v7 .
   It was later rewritten by James Clark as a macro package for groff.
   The stand-alone implementation that is part of the
   .Xr mandoc 1
   utility written by Kristaps Dzonsons appeared in
   .Ox 4.6 .
   .Sh AUTHORS
   This
 .Nm  .Nm
 reference was written by  reference was written by
 .An Kristaps Dzonsons Aq kristaps@bsd.lv .  .An Kristaps Dzonsons Aq kristaps@bsd.lv .
Legend:
Removed from v.1.77  
changed lines
  Added in v.1.97
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