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Diff for /mandoc/mdoc.7 between version 1.59 and 1.79

version 1.59, 2009/08/20 13:32:09 version 1.79, 2010/01/01 13:35:30
Line 73  whitespace are stripped from input.
Line 73  whitespace are stripped from input.
 .  .
 .Ss Reserved Characters  .Ss Reserved Characters
 Within a macro line, the following characters are reserved:  Within a macro line, the following characters are reserved:
   .Pp
 .Bl -tag -width Ds -offset indent -compact  .Bl -tag -width Ds -offset indent -compact
 .It \&.  .It \&.
 .Pq period  .Pq period
Line 130  and
Line 131  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), or P and R  escape followed by an indicator: B (bold), I, (italic), R (Roman), or P
 (Roman, or reset).  This form is not recommended for  (revert to previous mode):
   .Pp
   .D1 \efBbold\efR \efIitalic\efP
   .Pp
   A numerical representation 3, 2, or 1 (bold, italic, and Roman,
   respectively) may be used instead.  A text decoration is valid within
   the current font scope only:  if a macro opens a font scope alongside
   its own scope, such as
   .Sx \&Bf
   .Cm \&Sy ,
   in-scope invocations of
   .Sq \ef
   are only valid within the font scope of the macro.  If
   .Sq \ef
   is specified outside of any font scope, such as in unenclosed, free-form
   text, it will affect the remainder of the document.
   .Pp
   Text may also be sized with the
   .Sq \es
   escape, whose syntax is one of
   .Sq \es+-n
   for one-digit numerals;
   .Sq \es(+-nn
   or
   .Sq \es+-(nn
   for two-digit numerals; and
   .Sq \es[+-N] ,
   .Sq \es+-[N] ,
   .Sq \es'+-N' ,
   or
   .Sq \es+-'N'
   for arbitrary-digit numerals:
   .Pp
   .D1 \es+1bigger\es-1
   .D1 \es[+10]much bigger\es[-10]
   .D1 \es+(10much bigger\es-(10
   .D1 \es+'100'much much bigger\es-'100'
   .Pp
   Note these forms are
   .Em not
   recommended for
 .Nm ,  .Nm ,
 which encourages semantic, not presentation, annotation.  which encourages semantic annotation.
 .  .
 .  .
 .Ss Predefined Strings  .Ss Predefined Strings
Line 208  considered literal text.  Thus, the following produces
Line 249  considered literal text.  Thus, the following produces
 .Pp  .Pp
 In free-form mode, quotes are regarded as opaque text.  In free-form mode, quotes are regarded as opaque text.
 .  .
   .Ss Dates
   There are several macros in
   .Nm
   that require a date argument.  The canonical form for dates is the
   American format:
   .Pp
   .D1 Cm Month Day , Year
   .Pp
   The
   .Cm Day
   value is an optionally zero-padded numeral.  The
   .Cm Month
   value is the full month name.  The
   .Cm Year
   value is the full four-digit year.
   .Pp
   Reduced form dates are broken-down canonical form dates:
   .Pp
   .D1 Cm Month , Year
   .D1 Cm Year
   .Pp
   Some examples of valid dates follow:
   .Pp
   .D1 "May, 2009" Pq reduced form
   .D1 "2009" Pq reduced form
   .D1 "May 20, 2009" Pq canonical form
 .  .
   .Ss Scaling Widths
   Many macros support scaled widths for their arguments, such as
   stipulating a two-inch list indentation with the following:
   .Bd -literal -offset indent
   \&.Bl -tag -width 2i
   .Ed
   .
   .Pp
   The syntax for scaled widths is
   .Sq Li [+-]?[0-9]*.[0-9]*[:unit:] ,
   where a decimal must be preceded or proceeded by at least one digit.
   Negative numbers, while accepted, are truncated to zero.  The following
   scaling units are accepted:
   .Pp
   .Bl -tag -width Ds -offset indent -compact
   .It c
   centimetre
   .It i
   inch
   .It P
   pica (~1/6 inch)
   .It p
   point (~1/72 inch)
   .It f
   synonym for
   .Sq u
   .It v
   default vertical span
   .It m
   width of rendered
   .Sq m
   .Pq em
   character
   .It n
   width of rendered
   .Sq n
   .Pq en
   character
   .It u
   default horizontal span
   .It M
   mini-em (~1/100 em)
   .El
   .Pp
   Using anything other than
   .Sq m ,
   .Sq n ,
   .Sq u ,
   or
   .Sq v
   is necessarily non-portable across output media.  See
   .Sx COMPATIBILITY .
   .
   .
 .Sh MANUAL STRUCTURE  .Sh MANUAL STRUCTURE
 Each  A well-formed
 .Nm  .Nm
 document must begin with a document prologue, containing, in order,  document consists of a document prologue followed by one or more
 .Sq \&Dd ,  sections.
 .Sq \&Dt ,  .Pp
   The prologue, which consists of (in order) the
   .Sx \&Dd ,
   .Sx \&Dt ,
 and  and
 .Sq \&Os ,  .Sx \&Os
 then the NAME section containing at least one  macros, is required for every document.
 .Sq \&Nm  .Pp
   The first section (sections are denoted by
   .Sx \&Sh )
   must be the NAME section, consisting of at least one
   .Sx \&Nm
 followed by  followed by
 .Sq \&Nd :  .Sx \&Nd .
   .Pp
   Following that, convention dictates specifying at least the SYNOPSIS and
   DESCRIPTION sections, although this varies between manual sections.
   .Pp
   The following is a well-formed skeleton
   .Nm
   file:
 .Bd -literal -offset indent  .Bd -literal -offset indent
 \&.Dd $\&Mdocdate$  \&.Dd $\&Mdocdate$
 \&.Dt mdoc 7  \&.Dt mdoc 7
Line 263  utility processes files ...
Line 398  utility processes files ...
 \&.\e\*q .Sh BUGS  \&.\e\*q .Sh BUGS
 \&.\e\*q .Sh SECURITY CONSIDERATIONS  \&.\e\*q .Sh SECURITY CONSIDERATIONS
 .Ed  .Ed
   .Pp
   The sections in a
   .Nm
   document are conventionally ordered as they appear above.  Sections
   should be composed as follows:
   .Bl -ohang -offset Ds
   .It Em NAME
   The name(s) and a short description of the documented material.  The
   syntax for this as follows:
   .Bd -literal -offset indent
   \&.Nm name0
   \&.Nm name1
   \&.Nm name2
   \&.Nd a short description
   .Ed
   .Pp
   The
   .Sx \&Nm
   macro(s) must precede the
   .Sx \&Nd
   macro.
 .  .
   .It Em LIBRARY
   The name of the library containing the documented material, which is
   assumed to be a function in a section 2 or 3 manual.  The syntax for
   this is as follows:
   .Bd -literal -offset indent
   \&.Lb libarm
   .Ed
 .Pp  .Pp
 Subsequent SYNOPSIS and DESCRIPTION sections are strongly encouraged,  See
 but non-compulsory.  .Sx \&Lb
   for details.
 .  .
   .It Em SYNOPSIS
   Documents the utility invocation syntax, function call syntax, or device
   configuration.
   .Pp
   For the first, utilities (sections 1, 6, and 8), this is
   generally structured as follows:
   .Bd -literal -offset indent
   \&.Nm foo
   \&.Op Fl v
   \&.Op Fl o Ar file
   \&.Op Ar
   \&.Nm bar
   \&.Op Fl v
   \&.Op Fl o Ar file
   \&.Op Ar
   .Ed
   .Pp
   For the second, function calls (sections 2, 3, 9):
   .Bd -literal -offset indent
   \&.Vt extern const char *global;
   \&.In header.h
   \&.Ft "char *"
   \&.Fn foo "const char *src"
   \&.Ft "char *"
   \&.Fn bar "const char *src"
   .Ed
   .Pp
   And for the third, configurations (section 4):
   .Bd -literal -offset indent
   \&.Cd \*qit* at isa? port 0x2e\*q
   \&.Cd \*qit* at isa? port 0x4e\*q
   .Ed
   .Pp
   Manuals not in these sections generally don't need a
   .Em SYNOPSIS .
 .  .
   .It Em DESCRIPTION
   This expands upon the brief, one-line description in
   .Em NAME .
   It usually contains a break-down of the options (if documenting a
   command), such as:
   .Bd -literal -offset indent
   The arguments are as follows:
   \&.Bl \-tag \-width Ds
   \&.It Fl v
   Print verbose information.
   \&.El
   .Ed
   Manuals not documenting a command won't include the above fragment.
   .
   .It Em IMPLEMENTATION NOTES
   Implementation-specific notes should be kept here.  This is useful when
   implementing standard functions that may have side effects or notable
   algorithmic implications.
   .
   .It Em EXIT STATUS
   Command exit status for section 1, 6, and 8 manuals.  This section is
   the dual of
   .Em RETURN VALUES ,
   which is used for functions.  Historically, this information was
   described in
   .Em DIAGNOSTICS ,
   a practise that is now discouraged.
   .Pp
   See
   .Sx \&Ex .
   .
   .It Em RETURN VALUES
   This section is the dual of
   .Em EXIT STATUS ,
   which is used for commands.  It documents the return values of functions
   in sections 2, 3, and 9.
   .Pp
   See
   .Sx \&Rv .
   .
   .It Em ENVIRONMENT
   Documents any usages of environment variables, e.g.,
   .Xr environ 7 .
   .Pp
   See
   .Sx \&Ev .
   .
   .It Em FILES
   Documents files used.  It's helpful to document both the file and a
   short description of how the file is used (created, modified, etc.).
   .Pp
   See
   .Sx \&Pa .
   .
   .It Em EXAMPLES
   Example usages.  This often contains snippets of well-formed,
   well-tested invocations.  Make doubly sure that your examples work
   properly!
   .
   .It Em DIAGNOSTICS
   Documents error conditions.  This is most useful in section 4 manuals.
   Historically, this section was used in place of
   .Em EXIT STATUS
   for manuals in sections 1, 6, and 8; however, this practise is
   discouraged.
   .Pp
   See
   .Sx \&Bl No \-diag .
   .
   .It Em ERRORS
   Documents error handling in sections 2, 3, and 9.
   .Pp
   See
   .Sx \&Er .
   .
   .It Em SEE ALSO
   References other manuals with related topics.  This section should exist
   for most manuals.  Cross-references should conventionally be ordered
   first by section, then alphabetically.
   .Pp
   See
   .Sx \&Xr .
   .
   .It Em STANDARDS
   References any standards implemented or used.  If not adhering to any
   standards, the
   .Em HISTORY
   section should be used instead.
   .Pp
   See
   .Sx \&St .
   .
   .It Em HISTORY
   The history of any manual without a
   .Em STANDARDS
   section should be described in this section.
   .
   .It Em AUTHORS
   Credits to authors, if applicable, should appear in this section.
   Authors should generally be noted by both name and an e-mail address.
   .Pp
   See
   .Sx \&An .
   .
   .It Em CAVEATS
   Explanations of common misuses and misunderstandings should be explained
   in this section.
   .
   .It Em BUGS
   Extant bugs should be described in this section.
   .
   .It Em SECURITY CONSIDERATIONS
   Documents any security precautions that operators should consider.
   .
   .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 three characters in length and begin with a
 control character ,  control character ,
 .Sq \&. ,  .Sq \&. ,
 at the beginning of the line.  An arbitrary amount of whitespace may  at the beginning of the line.  An arbitrary amount of whitespace may
 sit between the control character and the macro name.  Thus,  sit between the control character and the macro name.  Thus, the
 .Sq \&.Pp  following are equivalent:
 and  .Bd -literal -offset indent
 .Sq \&.\ \ \ \&Pp  \&.Pp
 are equivalent.  Macro names are two or three characters in length.  \&.\ \ \ \&Pp
   .Ed
 .  .
 .Pp  .Pp
 The syntax of a macro depends on its classification.  In this section,  The syntax of a macro depends on its classification.  In this section,
Line 297  The
Line 614  The
 column indicates that the macro may be called subsequent to the initial  column indicates that the macro may be called subsequent to the initial
 line-macro.  If a macro is not callable, then its invocation after the  line-macro.  If a macro is not callable, then its invocation after the
 initial line macro is interpreted as opaque text, such that  initial line macro is interpreted as opaque text, such that
 .Sq \&.Fl Sh  .Sq \&.Fl \&Sh
 produces  produces
 .Sq Fl Sh .  .Sq Fl \&Sh .
 .  .
 .Pp  .Pp
 The  The
Line 317  column, if applicable, describes closure rules.
Line 634  column, if applicable, describes closure rules.
 .Ss Block full-explicit  .Ss Block full-explicit
 Multi-line scope closed by an explicit closing macro.  All macros  Multi-line scope closed by an explicit closing macro.  All macros
 contains bodies; only  contains bodies; only
 .Pq Sq \&Bf  .Sx \&Bf
 contains a head.  contains a head.
 .Bd -literal -offset indent  .Bd -literal -offset indent
 \&.Yo \(lB\-arg \(lBparm...\(rB\(rB \(lBhead...\(rB  \&.Yo \(lB\-arg \(lBparm...\(rB\(rB \(lBhead...\(rB
Line 328  contains a head.
Line 645  contains a head.
 .Pp  .Pp
 .Bl -column -compact -offset indent "MacroX" "CallableX" "ParsableX" "closed by XXX"  .Bl -column -compact -offset indent "MacroX" "CallableX" "ParsableX" "closed by XXX"
 .It Em Macro Ta Em Callable Ta Em Parsable Ta Em Scope  .It Em Macro Ta Em Callable Ta Em Parsable Ta Em Scope
 .It \&Bd     Ta    \&No     Ta    \&No     Ta    closed by \&Ed  .It Sx \&Bd  Ta    \&No     Ta    \&No     Ta    closed by Sx \&Ed
 .It \&Bf     Ta    \&No     Ta    \&No     Ta    closed by \&Ef  .It Sx \&Bf  Ta    \&No     Ta    \&No     Ta    closed by Sx \&Ef
 .It \&Bk     Ta    \&No     Ta    \&No     Ta    closed by \&Ek  .It Sx \&Bk  Ta    \&No     Ta    \&No     Ta    closed by Sx \&Ek
 .It \&Bl     Ta    \&No     Ta    \&No     Ta    closed by \&El  .It Sx \&Bl  Ta    \&No     Ta    \&No     Ta    closed by Sx \&El
 .It \&Ed     Ta    \&No     Ta    \&No     Ta    opened by \&Bd  .It Sx \&Ed  Ta    \&No     Ta    \&No     Ta    opened by Sx \&Bd
 .It \&Ef     Ta    \&No     Ta    \&No     Ta    opened by \&Bf  .It Sx \&Ef  Ta    \&No     Ta    \&No     Ta    opened by Sx \&Bf
 .It \&Ek     Ta    \&No     Ta    \&No     Ta    opened by \&Bk  .It Sx \&Ek  Ta    \&No     Ta    \&No     Ta    opened by Sx \&Bk
 .It \&El     Ta    \&No     Ta    \&No     Ta    opened by \&Bl  .It Sx \&El  Ta    \&No     Ta    \&No     Ta    opened by Sx \&Bl
 .El  .El
 .  .
 .  .
Line 343  contains a head.
Line 660  contains a head.
 Multi-line scope closed by end-of-file or implicitly by another macro.  Multi-line scope closed by end-of-file or implicitly by another macro.
 All macros have bodies; some  All macros have bodies; some
 .Po  .Po
 .Sq \&It \-bullet ,  .Sx \&It Fl bullet ,
 .Sq \-hyphen ,  .Fl hyphen ,
 .Sq \-dash ,  .Fl dash ,
 .Sq \-enum ,  .Fl enum ,
 .Sq \-item  .Fl item
 .Pc  .Pc
 don't have heads, while  don't have heads; only one
 .Sq \&It \-column  .Po
 may have multiple heads.  .Sx \&It Fl column
   .Pc
   has multiple heads.
 .Bd -literal -offset indent  .Bd -literal -offset indent
 \&.Yo \(lB\-arg \(lBparm...\(rB\(rB \(lBhead... \(lBTa head...\(rB\(rB  \&.Yo \(lB\-arg \(lBparm...\(rB\(rB \(lBhead... \(lBTa head...\(rB\(rB
 \(lBbody...\(rB  \(lBbody...\(rB
Line 360  may have multiple heads.
Line 679  may have multiple heads.
 .Pp  .Pp
 .Bl -column -compact -offset indent "MacroX" "CallableX" "ParsableX" "closed by XXXXXXXXXXX"  .Bl -column -compact -offset indent "MacroX" "CallableX" "ParsableX" "closed by XXXXXXXXXXX"
 .It Em Macro Ta Em Callable Ta Em Parsable Ta Em Scope  .It Em Macro Ta Em Callable Ta Em Parsable Ta Em Scope
 .It \&It     Ta    \&No     Ta    Yes      Ta    closed by \&It, \&El  .It Sx \&It  Ta    \&No     Ta    Yes      Ta    closed by Sx \&It , Sx \&El
 .It \&Nd     Ta    \&No     Ta    \&No     Ta    closed by \&Sh  .It Sx \&Nd  Ta    \&No     Ta    \&No     Ta    closed by Sx \&Sh
 .It \&Sh     Ta    \&No     Ta    \&No     Ta    closed by \&Sh  .It Sx \&Sh  Ta    \&No     Ta    \&No     Ta    closed by Sx \&Sh
 .It \&Ss     Ta    \&No     Ta    \&No     Ta    closed by \&Sh, \&Ss  .It Sx \&Ss  Ta    \&No     Ta    \&No     Ta    closed by Sx \&Sh , Sx \&Ss
 .El  .El
 .  .
 .  .
 .Ss Block partial-explicit  .Ss Block partial-explicit
 Like block full-explicit, but also with single-line scope.  Each  Like block full-explicit, but also with single-line scope.  Each
 has at least a body and, in limited circumstances, a head  has at least a body and, in limited circumstances, a head
 .Pq So \&Fo Sc , So \&Eo Sc  .Po
   .Sx \&Fo ,
   .Sx \&Eo
   .Pc
 and/or tail  and/or tail
 .Pq So \&Ec Sc .  .Pq Sx \&Ec .
 .Bd -literal -offset indent  .Bd -literal -offset indent
 \&.Yo \(lB\-arg \(lBparm...\(rB\(rB \(lBhead...\(rB  \&.Yo \(lB\-arg \(lBparm...\(rB\(rB \(lBhead...\(rB
 \(lBbody...\(rB  \(lBbody...\(rB
Line 385  and/or tail
Line 707  and/or tail
 .Pp  .Pp
 .Bl -column "MacroX" "CallableX" "ParsableX" "closed by XXXX" -compact -offset indent  .Bl -column "MacroX" "CallableX" "ParsableX" "closed by XXXX" -compact -offset indent
 .It Em Macro Ta Em Callable Ta Em Parsable Ta Em Scope  .It Em Macro Ta Em Callable Ta Em Parsable Ta Em Scope
 .It \&Ac     Ta    Yes      Ta    Yes      Ta    opened by \&Ao  .It Sx \&Ac  Ta    Yes      Ta    Yes      Ta    opened by Sx \&Ao
 .It \&Ao     Ta    Yes      Ta    Yes      Ta    closed by \&Ac  .It Sx \&Ao  Ta    Yes      Ta    Yes      Ta    closed by Sx \&Ac
 .It \&Bc     Ta    Yes      Ta    Yes      Ta    closed by \&Bo  .It Sx \&Bc  Ta    Yes      Ta    Yes      Ta    closed by Sx \&Bo
 .It \&Bo     Ta    Yes      Ta    Yes      Ta    opened by \&Bc  .It Sx \&Bo  Ta    Yes      Ta    Yes      Ta    opened by Sx \&Bc
 .It \&Brc    Ta    Yes      Ta    Yes      Ta    opened by \&Bro  .It Sx \&Brc Ta    Yes      Ta    Yes      Ta    opened by Sx \&Bro
 .It \&Bro    Ta    Yes      Ta    Yes      Ta    closed by \&Brc  .It Sx \&Bro Ta    Yes      Ta    Yes      Ta    closed by Sx \&Brc
 .It \&Dc     Ta    Yes      Ta    Yes      Ta    opened by \&Do  .It Sx \&Dc  Ta    Yes      Ta    Yes      Ta    opened by Sx \&Do
 .It \&Do     Ta    Yes      Ta    Yes      Ta    closed by \&Dc  .It Sx \&Do  Ta    Yes      Ta    Yes      Ta    closed by Sx \&Dc
 .It \&Ec     Ta    Yes      Ta    Yes      Ta    opened by \&Eo  .It Sx \&Ec  Ta    Yes      Ta    Yes      Ta    opened by Sx \&Eo
 .It \&Eo     Ta    Yes      Ta    Yes      Ta    closed by \&Ec  .It Sx \&Eo  Ta    Yes      Ta    Yes      Ta    closed by Sx \&Ec
 .It \&Fc     Ta    Yes      Ta    Yes      Ta    opened by \&Fo  .It Sx \&Fc  Ta    Yes      Ta    Yes      Ta    opened by Sx \&Fo
 .It \&Fo     Ta    \&No     Ta    \&No     Ta    closed by \&Fc  .It Sx \&Fo  Ta    \&No     Ta    \&No     Ta    closed by Sx \&Fc
 .It \&Oc     Ta    Yes      Ta    Yes      Ta    closed by \&Oo  .It Sx \&Oc  Ta    Yes      Ta    Yes      Ta    closed by Sx \&Oo
 .It \&Oo     Ta    Yes      Ta    Yes      Ta    opened by \&Oc  .It Sx \&Oo  Ta    Yes      Ta    Yes      Ta    opened by Sx \&Oc
 .It \&Pc     Ta    Yes      Ta    Yes      Ta    closed by \&Po  .It Sx \&Pc  Ta    Yes      Ta    Yes      Ta    closed by Sx \&Po
 .It \&Po     Ta    Yes      Ta    Yes      Ta    opened by \&Pc  .It Sx \&Po  Ta    Yes      Ta    Yes      Ta    opened by Sx \&Pc
 .It \&Qc     Ta    Yes      Ta    Yes      Ta    opened by \&Oo  .It Sx \&Qc  Ta    Yes      Ta    Yes      Ta    opened by Sx \&Oo
 .It \&Qo     Ta    Yes      Ta    Yes      Ta    closed by \&Oc  .It Sx \&Qo  Ta    Yes      Ta    Yes      Ta    closed by Sx \&Oc
 .It \&Re     Ta    \&No     Ta    \&No     Ta    opened by \&Rs  .It Sx \&Re  Ta    \&No     Ta    \&No     Ta    opened by Sx \&Rs
 .It \&Rs     Ta    \&No     Ta    \&No     Ta    closed by \&Re  .It Sx \&Rs  Ta    \&No     Ta    \&No     Ta    closed by Sx \&Re
 .It \&Sc     Ta    Yes      Ta    Yes      Ta    opened by \&So  .It Sx \&Sc  Ta    Yes      Ta    Yes      Ta    opened by Sx \&So
 .It \&So     Ta    Yes      Ta    Yes      Ta    closed by \&Sc  .It Sx \&So  Ta    Yes      Ta    Yes      Ta    closed by Sx \&Sc
 .It \&Xc     Ta    Yes      Ta    Yes      Ta    opened by \&Xo  .It Sx \&Xc  Ta    Yes      Ta    Yes      Ta    opened by Sx \&Xo
 .It \&Xo     Ta    Yes      Ta    Yes      Ta    closed by \&Xc  .It Sx \&Xo  Ta    Yes      Ta    Yes      Ta    closed by Sx \&Xc
 .El  .El
 .  .
 .  .
Line 423  or end of line.
Line 745  or end of line.
 .Pp  .Pp
 .Bl -column "MacroX" "CallableX" "ParsableX" -compact -offset indent  .Bl -column "MacroX" "CallableX" "ParsableX" -compact -offset indent
 .It Em Macro Ta Em Callable Ta Em Parsable  .It Em Macro Ta Em Callable Ta Em Parsable
 .It \&Aq     Ta    Yes      Ta    Yes  .It Sx \&Aq  Ta    Yes      Ta    Yes
 .It \&Bq     Ta    Yes      Ta    Yes  .It Sx \&Bq  Ta    Yes      Ta    Yes
 .It \&Brq    Ta    Yes      Ta    Yes  .It Sx \&Brq Ta    Yes      Ta    Yes
 .It \&D1     Ta    \&No     Ta    \&Yes  .It Sx \&D1  Ta    \&No     Ta    \&Yes
 .It \&Dl     Ta    \&No     Ta    Yes  .It Sx \&Dl  Ta    \&No     Ta    Yes
 .It \&Dq     Ta    Yes      Ta    Yes  .It Sx \&Dq  Ta    Yes      Ta    Yes
 .It \&Op     Ta    Yes      Ta    Yes  .It Sx \&Op  Ta    Yes      Ta    Yes
 .It \&Pq     Ta    Yes      Ta    Yes  .It Sx \&Pq  Ta    Yes      Ta    Yes
 .It \&Ql     Ta    Yes      Ta    Yes  .It Sx \&Ql  Ta    Yes      Ta    Yes
 .It \&Qq     Ta    Yes      Ta    Yes  .It Sx \&Qq  Ta    Yes      Ta    Yes
 .It \&Sq     Ta    Yes      Ta    Yes  .It Sx \&Sq  Ta    Yes      Ta    Yes
 .El  .El
 .  .
 .  .
Line 456  then the macro accepts an arbitrary number of argument
Line 778  then the macro accepts an arbitrary number of argument
 .Pp  .Pp
 .Bl -column "MacroX" "CallableX" "ParsableX" "Arguments" -compact -offset indent  .Bl -column "MacroX" "CallableX" "ParsableX" "Arguments" -compact -offset indent
 .It Em Macro Ta Em Callable Ta Em Parsable Ta Em Arguments  .It Em Macro Ta Em Callable Ta Em Parsable Ta Em Arguments
 .It \&%A     Ta    \&No     Ta    \&No     Ta    >0  .It Sx \&%A  Ta    \&No     Ta    \&No     Ta    >0
 .It \&%B     Ta    \&No     Ta    \&No     Ta    >0  .It Sx \&%B  Ta    \&No     Ta    \&No     Ta    >0
 .It \&%C     Ta    \&No     Ta    \&No     Ta    >0  .It Sx \&%C  Ta    \&No     Ta    \&No     Ta    >0
 .It \&%D     Ta    \&No     Ta    \&No     Ta    >0  .It Sx \&%D  Ta    \&No     Ta    \&No     Ta    >0
 .It \&%I     Ta    \&No     Ta    \&No     Ta    >0  .It Sx \&%I  Ta    \&No     Ta    \&No     Ta    >0
 .It \&%J     Ta    \&No     Ta    \&No     Ta    >0  .It Sx \&%J  Ta    \&No     Ta    \&No     Ta    >0
 .It \&%N     Ta    \&No     Ta    \&No     Ta    >0  .It Sx \&%N  Ta    \&No     Ta    \&No     Ta    >0
 .It \&%O     Ta    \&No     Ta    \&No     Ta    >0  .It Sx \&%O  Ta    \&No     Ta    \&No     Ta    >0
 .It \&%P     Ta    \&No     Ta    \&No     Ta    >0  .It Sx \&%P  Ta    \&No     Ta    \&No     Ta    >0
 .It \&%R     Ta    \&No     Ta    \&No     Ta    >0  .It Sx \&%Q  Ta    \&No     Ta    \&No     Ta    >0
 .It \&%T     Ta    \&No     Ta    \&No     Ta    >0  .It Sx \&%R  Ta    \&No     Ta    \&No     Ta    >0
 .It \&%V     Ta    \&No     Ta    \&No     Ta    >0  .It Sx \&%T  Ta    \&No     Ta    \&No     Ta    >0
 .It \&Ad     Ta    Yes      Ta    Yes      Ta    n  .It Sx \&%U  Ta    \&No     Ta    \&No     Ta    >0
 .It \&An     Ta    Yes      Ta    Yes      Ta    n  .It Sx \&%V  Ta    \&No     Ta    \&No     Ta    >0
 .It \&Ap     Ta    Yes      Ta    Yes      Ta    0  .It Sx \&Ad  Ta    Yes      Ta    Yes      Ta    n
 .It \&Ar     Ta    Yes      Ta    Yes      Ta    n  .It Sx \&An  Ta    Yes      Ta    Yes      Ta    n
 .It \&At     Ta    Yes      Ta    Yes      Ta    1  .It Sx \&Ap  Ta    Yes      Ta    Yes      Ta    0
 .It \&Bsx    Ta    Yes      Ta    Yes      Ta    n  .It Sx \&Ar  Ta    Yes      Ta    Yes      Ta    n
 .It \&Bt     Ta    \&No     Ta    \&No     Ta    0  .It Sx \&At  Ta    Yes      Ta    Yes      Ta    1
 .It \&Bx     Ta    Yes      Ta    Yes      Ta    n  .It Sx \&Bsx Ta    Yes      Ta    Yes      Ta    n
 .It \&Cd     Ta    Yes      Ta    Yes      Ta    >0  .It Sx \&Bt  Ta    \&No     Ta    \&No     Ta    0
 .It \&Cm     Ta    Yes      Ta    Yes      Ta    n  .It Sx \&Bx  Ta    Yes      Ta    Yes      Ta    n
 .It \&Db     Ta    \&No     Ta    \&No     Ta    1  .It Sx \&Cd  Ta    Yes      Ta    Yes      Ta    >0
 .It \&Dd     Ta    \&No     Ta    \&No     Ta    >0  .It Sx \&Cm  Ta    Yes      Ta    Yes      Ta    n
 .It \&Dt     Ta    \&No     Ta    \&No     Ta    n  .It Sx \&Db  Ta    \&No     Ta    \&No     Ta    1
 .It \&Dv     Ta    Yes      Ta    Yes      Ta    n  .It Sx \&Dd  Ta    \&No     Ta    \&No     Ta    >0
 .It \&Dx     Ta    Yes      Ta    Yes      Ta    n  .It Sx \&Dt  Ta    \&No     Ta    \&No     Ta    n
 .It \&Em     Ta    Yes      Ta    Yes      Ta    >0  .It Sx \&Dv  Ta    Yes      Ta    Yes      Ta    n
 .It \&En     Ta    \&No     Ta    \&No     Ta    0  .It Sx \&Dx  Ta    Yes      Ta    Yes      Ta    n
 .It \&Er     Ta    Yes      Ta    Yes      Ta    >0  .It Sx \&Em  Ta    Yes      Ta    Yes      Ta    >0
 .It \&Es     Ta    \&No     Ta    \&No     Ta    0  .It Sx \&En  Ta    \&No     Ta    \&No     Ta    0
 .It \&Ev     Ta    Yes      Ta    Yes      Ta    n  .It Sx \&Er  Ta    Yes      Ta    Yes      Ta    >0
 .It \&Ex     Ta    \&No     Ta    \&No     Ta    n  .It Sx \&Es  Ta    \&No     Ta    \&No     Ta    0
 .It \&Fa     Ta    Yes      Ta    Yes      Ta    n  .It Sx \&Ev  Ta    Yes      Ta    Yes      Ta    n
 .It \&Fd     Ta    \&No     Ta    \&No     Ta    >0  .It Sx \&Ex  Ta    \&No     Ta    \&No     Ta    n
 .It \&Fl     Ta    Yes      Ta    Yes      Ta    n  .It Sx \&Fa  Ta    Yes      Ta    Yes      Ta    n
 .It \&Fn     Ta    Yes      Ta    Yes      Ta    >0  .It Sx \&Fd  Ta    \&No     Ta    \&No     Ta    >0
 .It \&Fr     Ta    \&No     Ta    \&No     Ta    n  .It Sx \&Fl  Ta    Yes      Ta    Yes      Ta    n
 .It \&Ft     Ta    Yes      Ta    Yes      Ta    n  .It Sx \&Fn  Ta    Yes      Ta    Yes      Ta    >0
 .It \&Fx     Ta    Yes      Ta    Yes      Ta    n  .It Sx \&Fr  Ta    \&No     Ta    \&No     Ta    n
 .It \&Hf     Ta    \&No     Ta    \&No     Ta    n  .It Sx \&Ft  Ta    Yes      Ta    Yes      Ta    n
 .It \&Ic     Ta    Yes      Ta    Yes      Ta    >0  .It Sx \&Fx  Ta    Yes      Ta    Yes      Ta    n
 .It \&In     Ta    \&No     Ta    \&No     Ta    n  .It Sx \&Hf  Ta    \&No     Ta    \&No     Ta    n
 .It \&Lb     Ta    \&No     Ta    \&No     Ta    1  .It Sx \&Ic  Ta    Yes      Ta    Yes      Ta    >0
 .It \&Li     Ta    Yes      Ta    Yes      Ta    n  .It Sx \&In  Ta    \&No     Ta    \&No     Ta    n
 .It \&Lk     Ta    Yes      Ta    Yes      Ta    n  .It Sx \&Lb  Ta    \&No     Ta    \&No     Ta    1
 .It \&Lp     Ta    \&No     Ta    \&No     Ta    0  .It Sx \&Li  Ta    Yes      Ta    Yes      Ta    n
 .It \&Ms     Ta    Yes      Ta    Yes      Ta    >0  .It Sx \&Lk  Ta    Yes      Ta    Yes      Ta    n
 .It \&Mt     Ta    Yes      Ta    Yes      Ta    >0  .It Sx \&Lp  Ta    \&No     Ta    \&No     Ta    0
 .It \&Nm     Ta    Yes      Ta    Yes      Ta    n  .It Sx \&Ms  Ta    Yes      Ta    Yes      Ta    >0
 .It \&No     Ta    Yes      Ta    Yes      Ta    0  .It Sx \&Mt  Ta    Yes      Ta    Yes      Ta    >0
 .It \&Ns     Ta    Yes      Ta    Yes      Ta    0  .It Sx \&Nm  Ta    Yes      Ta    Yes      Ta    n
 .It \&Nx     Ta    Yes      Ta    Yes      Ta    n  .It Sx \&No  Ta    Yes      Ta    Yes      Ta    0
 .It \&Os     Ta    \&No     Ta    \&No     Ta    n  .It Sx \&Ns  Ta    Yes      Ta    Yes      Ta    0
 .It \&Ot     Ta    \&No     Ta    \&No     Ta    n  .It Sx \&Nx  Ta    Yes      Ta    Yes      Ta    n
 .It \&Ox     Ta    Yes      Ta    Yes      Ta    n  .It Sx \&Os  Ta    \&No     Ta    \&No     Ta    n
 .It \&Pa     Ta    Yes      Ta    Yes      Ta    n  .It Sx \&Ot  Ta    \&No     Ta    \&No     Ta    n
 .It \&Pf     Ta    \&No     Ta    Yes      Ta    1  .It Sx \&Ox  Ta    Yes      Ta    Yes      Ta    n
 .It \&Pp     Ta    \&No     Ta    \&No     Ta    0  .It Sx \&Pa  Ta    Yes      Ta    Yes      Ta    n
 .It \&Rv     Ta    \&No     Ta    \&No     Ta    n  .It Sx \&Pf  Ta    \&No     Ta    Yes      Ta    1
 .It \&Sm     Ta    \&No     Ta    \&No     Ta    1  .It Sx \&Pp  Ta    \&No     Ta    \&No     Ta    0
 .It \&St     Ta    \&No     Ta    Yes      Ta    1  .It Sx \&Rv  Ta    \&No     Ta    \&No     Ta    n
 .It \&Sx     Ta    Yes      Ta    Yes      Ta    >0  .It Sx \&Sm  Ta    \&No     Ta    \&No     Ta    1
 .It \&Sy     Ta    Yes      Ta    Yes      Ta    >0  .It Sx \&St  Ta    \&No     Ta    Yes      Ta    1
 .It \&Tn     Ta    Yes      Ta    Yes      Ta    >0  .It Sx \&Sx  Ta    Yes      Ta    Yes      Ta    >0
 .It \&Ud     Ta    \&No     Ta    \&No     Ta    0  .It Sx \&Sy  Ta    Yes      Ta    Yes      Ta    >0
 .It \&Ux     Ta    Yes      Ta    Yes      Ta    n  .It Sx \&Tn  Ta    Yes      Ta    Yes      Ta    >0
 .It \&Va     Ta    Yes      Ta    Yes      Ta    n  .It Sx \&Ud  Ta    \&No     Ta    \&No     Ta    0
 .It \&Vt     Ta    Yes      Ta    Yes      Ta    >0  .It Sx \&Ux  Ta    Yes      Ta    Yes      Ta    n
 .It \&Xr     Ta    Yes      Ta    Yes      Ta    >0, <3  .It Sx \&Va  Ta    Yes      Ta    Yes      Ta    n
 .It \&br     Ta    \&No     Ta    \&No     Ta    0  .It Sx \&Vt  Ta    Yes      Ta    Yes      Ta    >0
 .It \&sp     Ta    \&No     Ta    \&No     Ta    1  .It Sx \&Xr  Ta    Yes      Ta    Yes      Ta    >0, <3
   .It Sx \&br  Ta    \&No     Ta    \&No     Ta    0
   .It Sx \&sp  Ta    \&No     Ta    \&No     Ta    1
 .El  .El
 .  .
 .  .
   .Sh REFERENCE
   This section is a canonical reference of all macros, arranged
   alphabetically.  For the scoping of individual macros, see
   .Sx MACRO SYNTAX .
   .
   .Ss \&%A
   Author name of an
   .Sx \&Rs
   block.  Multiple authors should each be accorded their own
   .Sx \%%A
   line.  Author names should be ordered with full or abbreviated
   forename(s) first, then full surname.
   .
   .Ss \&%B
   Book title of an
   .Sx \&Rs
   block.  This macro may also be used in a non-bibliographic context when
   referring to book titles.
   .
   .Ss \&%C
   Publication city or location of an
   .Sx \&Rs
   block.
   .Pp
   .Em Remarks :
   this macro is not implemented in
   .Xr groff 1 .
   .
   .Ss \&%D
   Publication date of an
   .Sx \&Rs
   block.  This should follow the reduced or canonical form syntax
   described in
   .Sx Dates .
   .
   .Ss \&%I
   Publisher or issuer name of an
   .Sx \&Rs
   block.
   .
   .Ss \&%J
   Journal name of an
   .Sx \&Rs
   block.
   .
   .Ss \&%N
   Issue number (usually for journals) of an
   .Sx \&Rs
   block.
   .
   .Ss \&%O
   Optional information of an
   .Sx \&Rs
   block.
   .
   .Ss \&%P
   Book or journal page number of an
   .Sx \&Rs
   block.
   .
   .Ss \&%Q
   Institutional author (school, government, etc.) of an
   .Sx \&Rs
   block.  Multiple institutional authors should each be accorded their own
   .Sx \&%Q
   line.
   .
   .Ss \&%R
   Technical report name of an
   .Sx \&Rs
   block.
   .
   .Ss \&%T
   Article title of an
   .Sx \&Rs
   block.  This macro may also be used in a non-bibliographical context
   when referring to article titles.
   .
   .Ss \&%U
   URI of reference document.
   .
   .Ss \&%V
   Volume number of an
   .Sx \&Rs
   block.
   .
   .Ss \&Ac
   Closes an
   .Sx \&Ao
   block.  Does not have any tail arguments.
   .
   .Ss \&Ad
   Address construct: usually in the context of an computational address in
   memory, not a physical (post) address.
   .Pp
   Examples:
   .Bd -literal -offset indent
   \&.Ad [0,$]
   \&.Ad 0x00000000
   .Ed
   .
   .Ss \&An
   Author name.  This macro may alternatively accepts the following
   arguments, although these may not be specified along with a parameter:
   .Bl -tag -width 12n -offset indent
   .It Fl split
   Renders a line break before each author listing.
   .It Fl nosplit
   The opposite of
   .Fl split .
   .El
   .Pp
   In the AUTHORS section, the default is not to split the first author
   listing, but all subsequent author listings, whether or not they're
   interspersed by other macros or text, are split.  Thus, specifying
   .Fl split
   will cause the first listing also to be split.  If not in the AUTHORS
   section, the default is not to split.
   .Pp
   Examples:
   .Bd -literal -offset indent
   \&.An -nosplit
   \&.An J. E. Hopcraft ,
   \&.An J. D. Ullman .
   .Ed
   .Pp
   .Em Remarks :
   the effects of
   .Fl split
   or
   .Fl nosplit
   are re-set when entering the AUTHORS section, so if one specifies
   .Sx \&An Fl nosplit
   in the general document body, it must be re-specified in the AUTHORS
   section.
   .
   .Ss \&Ao
   Begins a block enclosed by angled brackets.  Does not have any head
   arguments.
   .Pp
   Examples:
   .Bd -literal -offset indent
   \&.Fl -key= Ns Ao Ar val Ac
   .Ed
   .Pp
   See also
   .Sx \&Aq .
   .
   .Ss \&Ap
   Inserts an apostrophe without any surrounding white-space.  This is
   generally used as a grammatic device when referring to the verb form of
   a function:
   .Bd -literal -offset indent
   \&.Fn execve Ap d
   .Ed
   .
   .Ss \&Aq
   Encloses its arguments in angled brackets.
   .Pp
   Examples:
   .Bd -literal -offset indent
   \&.Fl -key= Ns Aq Ar val
   .Ed
   .Pp
   .Em Remarks :
   this macro is often abused for rendering URIs, which should instead use
   .Sx \&Lk
   or
   .Sx \&Mt ,
   or to note pre-processor
   .Dq Li #include
   statements, which should use
   .Sx \&In .
   .Pp
   See also
   .Sx \&Ao .
   .
   .Ss \&Ar
   Command arguments.  If an argument is not provided, the string
   .Dq file ...
   is used as a default.
   .Pp
   Examples:
   .Bd -literal -offset indent
   \&.Fl o Ns Ar file1
   \&.Ar
   \&.Ar arg1 , arg2 .
   .Ed
   .
   .Ss \&At
   Formats an AT&T version.  Accepts at most one parameter:
   .Bl -tag -width 12n -offset indent
   .It Cm v[1-7] | 32v
   A version of
   .At .
   .It Cm V[.[1-4]]?
   A system version of
   .At .
   .El
   .Pp
   Note that these parameters do not begin with a hyphen.
   .Pp
   Examples:
   .Bd -literal -offset indent
   \&.At
   \&.At V.1
   .Ed
   .Pp
   See also
   .Sx \&Bsx ,
   .Sx \&Bx ,
   .Sx \&Dx ,
   .Sx \&Fx ,
   .Sx \&Nx ,
   .Sx \&Ox ,
   and
   .Sx \&Ux .
   .
   .Ss \&Bc
   Closes a
   .Sx \&Bo
   block.  Does not have any tail arguments.
   .
   .Ss \&Bd
   Begins a display block.  A display is collection of macros or text which
   may be collectively offset or justified in a manner different from that
   of the enclosing context.  By default, the block is preceded by a
   vertical space.
   .Pp
   Each display is associated with a type, which must be one of the
   following arguments:
   .Bl -tag -width 12n -offset indent
   .It Fl ragged
   Only left-justify the block.
   .It Fl unfilled
   Do not justify the block at all.
   .It Fl filled
   Left- and right-justify the block.
   .It Fl literal
   Alias for
   .Fl unfilled .
   .It Fl centered
   Centre-justify each line.
   .El
   .Pp
   The type must be provided first.  Secondary arguments are as follows:
   .Bl -tag -width 12n -offset indent
   .It Fl offset Ar width
   Offset by the value of
   .Ar width ,
   which is interpreted as one of the following, specified in order:
   .Bl -item
   .It
   As one of the pre-defined strings
   .Ar indent ,
   the width of standard indentation;
   .Ar indent-two ,
   twice
   .Ar indent ;
   .Ar left ,
   which has no effect ;
   .Ar right ,
   which justifies to the right margin; and
   .Ar center ,
   which aligns around an imagined centre axis.
   .It
   As a precalculated width for a named macro.  The most popular is the
   imaginary macro
   .Ar \&Ds ,
   which resolves to
   .Ar 6n .
   .It
   As a scaling unit following the syntax described in
   .Sx Scaling Widths .
   .It
   As the calculated string length of the opaque string.
   .El
   .Pp
   If unset, it will revert to the value of
   .Ar 8n
   as described in
   .Sx Scaling Widths .
   .It Fl compact
   Do not assert a vertical space before the block.
   .It Fl file Ar file
   Prepend the file
   .Ar file
   before any text or macros within the block.
   .El
   .Pp
   Examples:
   .Bd -literal -offset indent
   \&.Bd \-unfilled \-offset two-indent \-compact
      Hello       world.
   \&.Ed
   .Ed
   .Pp
   See also
   .Sx \&D1
   and
   .Sx \&Dl .
   .
   .Ss \&Bf
   .Ss \&Bk
   .Ss \&Bl
   .
   .Ss \&Bo
   Begins a block enclosed by square brackets.  Does not have any head
   arguments.
   .Pp
   Examples:
   .Bd -literal -offset indent
   \&.Bo 1 ,
   \&.Dv BUFSIZ Bc
   .Ed
   .Pp
   See also
   .Sx \&Bq .
   .
   .Ss \&Bq
   Encloses its arguments in square brackets.
   .Pp
   Examples:
   .Bd -literal -offset indent
   \&.Bq 1 , Dv BUFSIZ
   .Ed
   .Pp
   .Em Remarks :
   this macro is sometimes abused to emulate optional arguments for
   commands; the correct macros to use for this purpose are
   .Sx \&Op ,
   .Sx \&Oo ,
   and
   .Sx \&Oc .
   .Pp
   See also
   .Sx \&Bo .
   .
   .Ss \&Brc
   Closes a
   .Sx \&Bro
   block.  Does not have any tail arguments.
   .
   .Ss \&Bro
   Begins a block enclosed by curly braces.  Does not have any head
   arguments.
   .Pp
   Examples:
   .Bd -literal -offset indent
   \&.Bro 1 , ... ,
   \&.Va n Brc
   .Ed
   .Pp
   See also
   .Sx \&Brq .
   .
   .Ss \&Brq
   Encloses its arguments in curly braces.
   .Pp
   Examples:
   .Bd -literal -offset indent
   \&.Brq 1 , ... , Va n
   .Ed
   .Pp
   See also
   .Sx \&Bro .
   .
   .Ss \&Bsx
   Format the BSD/OS version provided as an argument, or a default value if
   no argument is provided.
   .Pp
   Examples:
   .Bd -literal -offset indent
   \&.Bsx 1.0
   \&.Bsx
   .Ed
   .Pp
   See also
   .Sx \&At ,
   .Sx \&Bx ,
   .Sx \&Dx ,
   .Sx \&Fx ,
   .Sx \&Nx ,
   .Sx \&Ox ,
   and
   .Sx \&Ux .
   .
   .Ss \&Bt
   Prints
   .Dq is currently in beta test.
   .
   .Ss \&Bx
   Format the BSD version provided as an argument, or a default value if no
   argument is provided.
   .Pp
   Examples:
   .Bd -literal -offset indent
   \&.Bx 4.4
   \&.Bx
   .Ed
   .Pp
   See also
   .Sx \&At ,
   .Sx \&Bsx ,
   .Sx \&Dx ,
   .Sx \&Fx ,
   .Sx \&Nx ,
   .Sx \&Ox ,
   and
   .Sx \&Ux .
   .
   .Ss \&Cd
   Configuration declaration (suggested for use only in section four
   manuals).  This denotes strings accepted by
   .Xr config 8 .
   .Pp
   Examples:
   .Bd -literal -offset indent
   \&.Cd device le0 at scode?
   .Ed
   .Pp
   .Em Remarks :
   this macro is commonly abused by using quoted literals to retain
   white-space and align consecutive
   .Sx \&Cd
   declarations.  This practise is discouraged.
   .
   .Ss \&Cm
   Command modifiers.  Useful when specifying configuration options or
   keys.
   .Pp
   Examples:
   .Bd -literal -offset indent
   \&.Cm ControlPath
   \&.Cm ControlMaster
   .Ed
   .Pp
   See also
   .Sx \&Fl .
   .
   .Ss \&D1
   One-line indented display.  This is formatted by the default rules and
   is useful for simple indented statements.  It is followed by a newline.
   .Pp
   Examples:
   .Bd -literal -offset indent
   \&.D1 Fl abcdefgh
   .Ed
   .Pp
   See also
   .Sx \&Bd
   and
   .Sx \&Dl .
   .
   .Ss \&Db
   .Ss \&Dc
   Closes a
   .Sx \&Do
   block.  Does not have any tail arguments.
   .
   .Ss \&Dd
   Document date.  This is the mandatory first macro of any
   .Nm
   manual.  Its calling syntax is as follows:
   .Pp
   .D1 \. Ns Sx \&Dd Cm date
   .Pp
   The
   .Cm date
   field may be either
   .Ar $\&Mdocdate$ ,
   which signifies the current manual revision date dictated by
   .Xr cvs 1 ,
   or instead a valid canonical date as specified by
   .Sx Dates .
   If a date does not conform, the current date is used instead.
   .Pp
   Examples:
   .Bd -literal -offset indent
   \&.Dd $\&Mdocdate$
   \&.Dd $\&Mdocdate: July 21 2007$
   \&.Dd July 21, 2007
   .Ed
   .Pp
   See also
   .Sx \&Dt
   and
   .Sx \&Os .
   .
   .Ss \&Dl
   One-line intended display.  This is formatted as literal text and is
   useful for commands and invocations.  It is followed by a newline.
   .Pp
   Examples:
   .Bd -literal -offset indent
   \&.Dl % mandoc mdoc.7 | less
   .Ed
   .Pp
   See also
   .Sx \&Bd
   and
   .Sx \&D1 .
   .
   .Ss \&Do
   Begins a block enclosed by double quotes.  Does not have any head
   arguments.
   .Pp
   Examples:
   .Bd -literal -offset indent
   \&.D1 Do April is the cruellest month Dc \e(em T.S. Eliot
   .Ed
   .Pp
   See also
   .Sx \&Dq .
   .
   .Ss \&Dq
   Encloses its arguments in double quotes.
   .Pp
   Examples:
   .Bd -literal -offset indent
   \&.Dq April is the cruellest month
   \e(em T.S. Eliot
   .Ed
   .Pp
   See also
   .Sx \&Do .
   .
   .Ss \&Dt
   Document title.  This is the mandatory second macro of any
   .Nm
   file.  Its calling syntax is as follows:
   .Pp
   .D1 \. Ns Sx \&Dt Cm title section Op Cm volume | arch
   .Pp
   Its arguments are as follows:
   .Bl -tag -width Ds -offset Ds
   .It Cm title
   The document's title (name).  This should be capitalised and is
   required.
   .It Cm section
   The manual section.  This may be one of
   .Ar 1
   .Pq utilities ,
   .Ar 2
   .Pq system calls ,
   .Ar 3
   .Pq libraries ,
   .Ar 3p
   .Pq Perl libraries ,
   .Ar 4
   .Pq devices ,
   .Ar 5
   .Pq file formats ,
   .Ar 6
   .Pq games ,
   .Ar 7
   .Pq miscellaneous ,
   .Ar 8
   .Pq system utilities ,
   .Ar 9
   .Pq kernel functions ,
   .Ar X11
   .Pq X Window System ,
   .Ar X11R6
   .Pq X Window System ,
   .Ar unass
   .Pq unassociated ,
   .Ar local
   .Pq local system ,
   .Ar draft
   .Pq draft manual ,
   or
   .Ar paper
   .Pq paper .
   It is also required and should correspond to the manual's filename
   suffix.
   .It Cm volume
   This overrides the volume inferred from
   .Ar section .
   This field is optional, and if specified, must be one of
   .Ar USD
   .Pq users' supplementary documents ,
   .Ar PS1
   .Pq programmers' supplementary documents ,
   .Ar AMD
   .Pq administrators' supplementary documents ,
   .Ar SMM
   .Pq system managers' manuals ,
   .Ar URM
   .Pq users' reference manuals ,
   .Ar PRM
   .Pq programmers' reference manuals ,
   .Ar KM
   .Pq kernel manuals ,
   .Ar IND
   .Pq master index ,
   .Ar MMI
   .Pq master index ,
   .Ar LOCAL
   .Pq local manuals ,
   .Ar LOC
   .Pq local manuals ,
   or
   .Ar CON
   .Pq contributed manuals .
   .It Cm arch
   This specifies a specific relevant architecture.  If
   .Cm volume
   is not provided, it may be used in its place, else it may be used
   subsequent that.  It, too, is optional.  It must be one of
   .Ar alpha ,
   .Ar amd64 ,
   .Ar amiga ,
   .Ar arc ,
   .Ar arm ,
   .Ar armish ,
   .Ar aviion ,
   .Ar hp300 ,
   .Ar hppa ,
   .Ar hppa64 ,
   .Ar i386 ,
   .Ar landisk ,
   .Ar luna88k ,
   .Ar mac68k ,
   .Ar macppc ,
   .Ar mvme68k ,
   .Ar mvme88k ,
   .Ar mvmeppc ,
   .Ar pmax ,
   .Ar sgi ,
   .Ar socppc ,
   .Ar sparc ,
   .Ar sparc64 ,
   .Ar sun3 ,
   .Ar vax ,
   or
   .Ar zaurus .
   .El
   .Pp
   Examples:
   .Bd -literal -offset indent
   \&.Dt FOO 1
   \&.Dt FOO 4 KM
   \&.Dt FOO 9 i386
   \&.Dt FOO 9 KM i386
   .Ed
   .Pp
   See also
   .Sx \&Dd
   and
   .Sx \&Os .
   .
   .Ss \&Dv
   Defined variables such as preprocessor constants.
   .Pp
   Examples:
   .Bd -literal -offset indent
   \&.Dv BUFSIZ
   \&.Dv STDOUT_FILENO
   .Ed
   .Pp
   See also
   .Sx \&Er .
   .
   .Ss \&Dx
   Format the DragonFly BSD version provided as an argument, or a default
   value if no argument is provided.
   .Pp
   Examples:
   .Bd -literal -offset indent
   \&.Dx 2.4.1
   \&.Dx
   .Ed
   .Pp
   See also
   .Sx \&At ,
   .Sx \&Bsx ,
   .Sx \&Bx ,
   .Sx \&Fx ,
   .Sx \&Nx ,
   .Sx \&Ox ,
   and
   .Sx \&Ux .
   .
   .Ss \&Ec
   .Ss \&Ed
   .Ss \&Ef
   .Ss \&Ek
   .Ss \&El
   .Ss \&Em
   Denotes text that should be emphasised.  Note that this is a
   presentation term and should not be used for stylistically decorating
   technical terms.
   .Pp
   Examples:
   .Bd -literal -offset indent
   \&.Ed Warnings!
   \&.Ed Remarks :
   .Ed
   .
   .Ss \&En
   .Ss \&Eo
   .Ss \&Er
   Error constants (suggested for use only in section two manuals).
   .Pp
   Examples:
   .Bd -literal -offset indent
   \&.Er EPERM
   \&.Er ENOENT
   .Ed
   .Pp
   See also
   .Sx \&Dv .
   .
   .Ss \&Es
   .
   .Ss \&Ev
   Environmental variables such as those specified in
   .Xr environ 7 .
   .Pp
   Examples:
   .Bd -literal -offset indent
   \&.Ev DISPLAY
   \&.Ev PATH
   .Ed
   .
   .Ss \&Ex
   Inserts text regarding a utility's exit values.  This macro must have
   first the
   .Fl std
   argument specified, then an optional
   .Ar utility .
   If
   .Ar utility
   is not provided, the document's name as stipulated in
   .Sx \&Nm
   is provided.
   .Ss \&Fa
   .Ss \&Fc
   .Ss \&Fd
   .Ss \&Fl
   Command-line flag.  Used when listing arguments to command-line
   utilities.  Prints a fixed-width hyphen
   .Sq \-
   before each delimited argument.  If no arguments are provided, a hyphen
   is still printed.
   .Pp
   Examples:
   .Bd -literal -offset indent
   \&.Fl a b c
   \&.Fl
   \&.Op Fl o Ns Ar file
   .Ed
   .Pp
   See also
   .Sx \&Cm .
   .
   .Ss \&Fn
   .Ss \&Fo
   .Ss \&Fr
   .Ss \&Ft
   .Ss \&Fx
   Format the FreeBSD version provided as an argument, or a default value
   if no argument is provided.
   .Pp
   Examples:
   .Bd -literal -offset indent
   \&.Fx 7.1
   \&.Fx
   .Ed
   .Pp
   See also
   .Sx \&At ,
   .Sx \&Bsx ,
   .Sx \&Bx ,
   .Sx \&Dx ,
   .Sx \&Nx ,
   .Sx \&Ox ,
   and
   .Sx \&Ux .
   .
   .Ss \&Hf
   .Ss \&Ic
   .Ss \&In
   .Ss \&It
   .Ss \&Lb
   .Ss \&Li
   .Ss \&Lk
   Format a hyperlink.  The calling syntax is as follows:
   .Pp
   .D1 \. Ns Sx \&Lk Cm uri Op Cm name
   .Pp
   Examples:
   .Bd -literal -offset indent
   \&.Lk http://bsd.lv "The BSD.lv Project"
   \&.Lk http://bsd.lv
   .Ed
   .Pp
   See also
   .Sx \&Mt .
   .
   .Ss \&Lp
   .Ss \&Ms
   .Ss \&Mt
   .Ss \&Nd
   .Ss \&Nm
   .Ss \&No
   .Ss \&Ns
   .Ss \&Nx
   Format the NetBSD version provided as an argument, or a default value if
   no argument is provided.
   .Pp
   Examples:
   .Bd -literal -offset indent
   \&.Nx 5.01
   \&.Nx
   .Ed
   .Pp
   See also
   .Sx \&At ,
   .Sx \&Bsx ,
   .Sx \&Bx ,
   .Sx \&Dx ,
   .Sx \&Fx ,
   .Sx \&Ox ,
   and
   .Sx \&Ux .
   .
   .Ss \&Oc
   .Ss \&Oo
   .Ss \&Op
   .Ss \&Os
   Document operating system version.  This is the mandatory third macro of
   any
   .Nm
   file.  Its calling syntax is as follows:
   .Pp
   .D1 \. Ns Sx \&Os Op Cm system
   .Pp
   The optional
   .Cm system
   parameter specifies the relevant operating system or environment.  Left
   unspecified, it defaults to the local operating system version.  This is
   the suggested form.
   .Pp
   Examples:
   .Bd -literal -offset indent
   \&.Os
   \&.Os KTH/CSC/TCS
   \&.Os BSD 4.3
   .Ed
   .Pp
   See also
   .Sx \&Dd
   and
   .Sx \&Dt .
   .
   .Ss \&Ot
   Unknown usage.
   .Pp
   .Em Remarks :
   this macro has been deprecated.
   .
   .Ss \&Ox
   Format the OpenBSD version provided as an argument, or a default value
   if no argument is provided.
   .Pp
   Examples:
   .Bd -literal -offset indent
   \&.Ox 4.5
   \&.Ox
   .Ed
   .Pp
   See also
   .Sx \&At ,
   .Sx \&Bsx ,
   .Sx \&Bx ,
   .Sx \&Dx ,
   .Sx \&Fx ,
   .Sx \&Nx ,
   and
   .Sx \&Ux .
   .
   .Ss \&Pa
   .Ss \&Pc
   .Ss \&Pf
   .Ss \&Po
   .Ss \&Pp
   .Ss \&Pq
   .Ss \&Qc
   .Ss \&Ql
   .Ss \&Qo
   .Ss \&Qq
   .
   .Ss \&Re
   Closes a
   .Sx \&Rs
   block.  Does not have any tail arguments.
   .
   .Ss \&Rs
   Begins a bibliographic
   .Pq Dq reference
   block.  Does not have any head arguments.  The block macro may only
   contain
   .Sx \&%A ,
   .Sx \&%B ,
   .Sx \&%C ,
   .Sx \&%D ,
   .Sx \&%I ,
   .Sx \&%J ,
   .Sx \&%N ,
   .Sx \&%O ,
   .Sx \&%P ,
   .Sx \&%Q ,
   .Sx \&%R ,
   .Sx \&%T ,
   and
   .Sx \&%V
   child macros (at least one must be specified).
   .Pp
   Examples:
   .Bd -literal -offset indent
   \&.Rs
   \&.%A J. E. Hopcroft
   \&.%A J. D. Ullman
   \&.%B Introduction to Automata Theory, Languages, and Computation
   \&.%I Addison-Wesley
   \&.%C Reading, Massachusettes
   \&.%D 1979
   \&.Re
   .Ed
   .Pp
   If an
   .Sx \&Rs
   block is used within a SEE ALSO section, a vertical space is asserted
   before the rendered output, else the block continues on the current
   line.
   .
   .Ss \&Rv
   .Ss \&Sc
   .Ss \&Sh
   .Ss \&Sm
   .Ss \&So
   .Ss \&Sq
   .Ss \&Ss
   .Ss \&St
   .Ss \&Sx
   .Ss \&Sy
   .Ss \&Tn
   .Ss \&Ud
   .Ss \&Ux
   Format the UNIX name.  Accepts no argument.
   .Pp
   Examples:
   .Bd -literal -offset indent
   \&.Ux
   .Ed
   .Pp
   See also
   .Sx \&At ,
   .Sx \&Bsx ,
   .Sx \&Bx ,
   .Sx \&Dx ,
   .Sx \&Fx ,
   .Sx \&Nx ,
   and
   .Sx \&Ox .
   .
   .Ss \&Va
   .Ss \&Vt
   .Ss \&Xc
   .Ss \&Xo
   .Ss \&Xr
   .Ss \&br
   .Ss \&sp
   .
   .
 .Sh COMPATIBILITY  .Sh COMPATIBILITY
 This section documents compatibility with other roff implementations, at  This section documents compatibility with other roff implementations, at
 this time limited to  this time limited to
Line 545  file re-write
Line 1846  file re-write
 .Pp  .Pp
 .Bl -dash -compact  .Bl -dash -compact
 .It  .It
 The  Historic
 .Sq \-split  .Xr groff 1
 or  does not print a dash for empty
 .Sq \-nosplit  .Sx \&Fl
 argument to  arguments.  This behaviour has been discontinued.
 .Sq \&An  
 applies to the whole document, not just to the current section as it  
 does in groff.  
 .It  .It
   .Xr groff 1
   behaves strangely (even between versions) when specifying
   .Sq \ef
   escapes within line-macro scopes.  These aberrations have been
   normalised.
   .It
   Negative scaling units are now truncated to zero instead of creating
   interesting conditions, such as with
   .Sx \&sp
   .Cm \-1i .
   Furthermore, the
   .Sq f
   scaling unit, while accepted, is rendered as the default unit.
   .It
 In quoted literals, groff allowed pair-wise double-quotes to produce a  In quoted literals, groff allowed pair-wise double-quotes to produce a
 standalone double-quote in formatted output.  This idiosyncratic  standalone double-quote in formatted output.  This idiosyncratic
 behaviour is no longer applicable.  behaviour is no longer applicable.
 .It  .It
   Display types
   .Sx \&Bd
   .Fl center
   and
   .Fl right
   are aliases for
   .Fl left .
 The  The
 .Sq \&sp  .Fl file Ar file
 macro does not accept negative numbers.  argument is ignored.  Since text is not right-justified,
   .Fl ragged
   and
   .Fl filled
   are aliases, as are
   .Fl literal
   and
   .Fl unfilled .
 .It  .It
 Blocks of whitespace are stripped from both macro and free-form text  Blocks of whitespace are stripped from both macro and free-form text
 lines (except when in literal mode), while groff would retain whitespace  lines (except when in literal mode), while groff would retain whitespace
Line 576  made historic groff
Line 1902  made historic groff
 .Qq go orbital  .Qq go orbital
 but is a proper delimiter in this implementation.  but is a proper delimiter in this implementation.
 .It  .It
 .Sq \&It \-nested  .Sx \&It
   .Fl nested
 is assumed for all lists (it wasn't in historic groff): any list may be  is assumed for all lists (it wasn't in historic groff): any list may be
 nested and  nested and
 .Sq \-enum  .Fl enum
 lists will restart the sequence only for the sub-list.  lists will restart the sequence only for the sub-list.
 .It  .It
 .Sq \&It \-column  
 syntax where column widths may be preceded by other arguments (instead  
 of proceeded) is not supported.  
 .It  
 The  
 .Sq \&At  
 macro only accepts a single parameter.  
 .It  
 Some manuals use  Some manuals use
 .Sq \&Li  .Sx \&Li
 incorrectly by following it with a reserved character and expecting the  incorrectly by following it with a reserved character and expecting the
 delimiter to render.  This is not supported.  delimiter to render.  This is not supported.
 .It  .It
 In groff, the  In groff, the
 .Sq \&Fo  .Sx \&Fo
 macro only produces the first parameter.  This is no longer the case.  macro only produces the first parameter.  This is no longer the case.
 .El  .El
 .  .
Line 611  The
Line 1930  The
 .Nm  .Nm
 reference was written by  reference was written by
 .An Kristaps Dzonsons Aq kristaps@kth.se .  .An Kristaps Dzonsons Aq kristaps@kth.se .
 .  .\"
 .  .\" XXX: this really isn't the place for these caveats.
 .Sh CAVEATS  .\" .
 There are many ambiguous parts of mdoc.  .\" .
 .  .\" .Sh CAVEATS
 .Pp  .\" There are many ambiguous parts of mdoc.
 .Bl -dash -compact  .\" .
 .It  .\" .Pp
 .Sq \&Fa  .\" .Bl -dash -compact
 should be  .\" .It
 .Sq \&Va  .\" .Sq \&Fa
 as function arguments are variables.  .\" should be
 .It  .\" .Sq \&Va
 .Sq \&Ft  .\" as function arguments are variables.
 should be  .\" .It
 .Sq \&Vt  .\" .Sq \&Ft
 as function return types are still types.  Furthermore, the  .\" should be
 .Sq \&Ft  .\" .Sq \&Vt
 should be removed and  .\" as function return types are still types.  Furthermore, the
 .Sq \&Fo ,  .\" .Sq \&Ft
 which ostensibly follows it, should follow the same convention as  .\" should be removed and
 .Sq \&Va .  .\" .Sq \&Fo ,
 .It  .\" which ostensibly follows it, should follow the same convention as
 .Sq \&Va  .\" .Sq \&Va .
 should formalise that only one or two arguments are acceptable: a  .\" .It
 variable name and optional, preceding type.  .\" .Sq \&Va
 .It  .\" should formalise that only one or two arguments are acceptable: a
 .Sq \&Fd  .\" variable name and optional, preceding type.
 is ambiguous.  It's commonly used to indicate an include file in the  .\" .It
 synopsis section.  .\" .Sq \&Fd
 .Sq \&In  .\" is ambiguous.  It's commonly used to indicate an include file in the
 should be used, instead.  .\" synopsis section.
 .It  .\" .Sq \&In
 Only the  .\" should be used, instead.
 .Sq \-literal  .\" .It
 argument to  .\" Only the
 .Sq \&Bd  .\" .Sq \-literal
 makes sense.  The remaining ones should be removed.  .\" argument to
 .It  .\" .Sq \&Bd
 The  .\" makes sense.  The remaining ones should be removed.
 .Sq \&Xo  .\" .It
 and  .\" The
 .Sq \&Xc  .\" .Sq \&Xo
 macros should be deprecated.  .\" and
 .It  .\" .Sq \&Xc
 The  .\" macros should be deprecated.
 .Sq \&Dt  .\" .It
 macro lacks clarity.  It should be absolutely clear which title will  .\" The
 render when formatting the manual page.  .\" .Sq \&Dt
 .It  .\" macro lacks clarity.  It should be absolutely clear which title will
 A  .\" render when formatting the manual page.
 .Sq \&Lx  .\" .It
 should be provided for Linux (\(`a la  .\" A
 .Sq \&Ox ,  .\" .Sq \&Lx
 .Sq \&Nx  .\" should be provided for Linux (\(`a la
 etc.).  .\" .Sq \&Ox ,
 .It  .\" .Sq \&Nx
 There's no way to refer to references in  .\" etc.).
 .Sq \&Rs/Re  .\" .It
 blocks.  .\" There's no way to refer to references in
 .It  .\" .Sq \&Rs/Re
 The \-split and \-nosplit dictates via  .\" blocks.
 .Sq \&An  .\" .It
 are re-set when entering and leaving the AUTHORS section.  .\" The \-split and \-nosplit dictates via
 .El  .\" .Sq \&An
 .  .\" are re-set when entering and leaving the AUTHORS section.
   .\" .El
   .\" .
Legend:
Removed from v.1.59  
changed lines
  Added in v.1.79
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