Provided by: groff_1.23.0-2_amd64 bug

Name

       groff_man - compose manual pages with GNU roff

Synopsis

       groff -man [option ...] [file ...]
       groff -m man [option ...] [file ...]

Description

       The  GNU  implementation of the man macro package is part of the groff document formatting
       system.  It is used to produce manual pages (“man pages”) like the one you are reading.

       This document presents the macros thematically; for those needing only a quick  reference,
       the  following  table  lists  them  alphabetically,  with  cross references to appropriate
       subsections below.

       Man page authors and maintainers who  are  not  already  experienced  groff  users  should
       consult   groff_man_style(7),  an  expanded  version  of  this  document,  for  additional
       explanations and advice.  It covers only those concepts required  for  man  page  document
       maintenance, and not the full breadth of the groff typesetting system.

       Macro   Meaning                      Subsection
       ───────────────────────────────────────────────────────────────
       .B      Bold                         Font style macros
       .BI     Bold, italic alternating     Font style macros
       .BR     Bold, roman alternating      Font style macros
       .EE     Example end                  Document structure macros
       .EX     Example begin                Document structure macros
       .I      Italic                       Font style macros
       .IB     Italic, bold alternating     Font style macros
       .IP     Indented paragraph           Paragraphing macros
       .IR     Italic, roman alternating    Font style macros
       .LP     Begin paragraph              Paragraphing macros
       .ME     Mail-to end                  Hyperlink macros
       .MR     Man page cross reference     Hyperlink macros
       .MT     Mail-to start                Hyperlink macros
       .P      Begin paragraph              Paragraphing macros
       .PP     Begin paragraph              Paragraphing macros
       .RB     Roman, bold alternating      Font style macros
       .RE     Relative inset end           Document structure macros
       .RI     Roman, italic alternating    Font style macros
       .RS     Relative inset start         Document structure macros
       .SB     Small bold                   Font style macros
       .SH     Section heading              Document structure macros
       .SM     Small                        Font style macros
       .SS     Subsection heading           Document structure macros
       .SY     Synopsis start               Command synopsis macros
       .TH     Title heading                Document structure macros
       .TP     Tagged paragraph             Paragraphing macros
       .TQ     Supplemental paragraph tag   Paragraphing macros
       .UE     URI end                      Hyperlink macros
       .UR     URI start                    Hyperlink macros
       .YS     Synopsis end                 Command synopsis macros

       We  discuss  other  macros  (.AT,  .DT,  .HP, .OP, .PD, and .UC) in subsection “Deprecated
       features” below.

       Throughout Unix documentation, a manual entry is referred  to  simply  as  a  “man  page”,
       regardless  of  its  length,  without  gendered implication, and irrespective of the macro
       package selected for its composition.

   Macro reference preliminaries
       A tagged paragraph describes each macro.  We present coupled pairs together, as  with  .EX
       and .EE.

       An  empty  macro  argument can be specified with a pair of double-quotes (""), but the man
       package is designed such that this should seldom be necessary.  Most macro arguments  will
       be formatted as text in the output; exceptions are noted.

   Document structure macros
       Document  structure  macros  organize  a man page's content.  All of them break the output
       line.  .TH (title heading) identifies the document as a man page and configures  the  page
       headers  and footers.  Section headings (.SH), one of which is mandatory and many of which
       are conventionally expected, facilitate location of material by the reader and aid the man
       page  writer to discuss all essential aspects of the topic.  Subsection headings (.SS) are
       optional and permit sections that  grow  long  to  develop  in  a  controlled  way.   Many
       technical  discussions  benefit  from  examples; lengthy ones, especially those reflecting
       multiple lines of input to or output from the system, are usefully bracketed  by  .EX  and
       .EE.   When none of the foregoing meets a structural demand, use .RS/.RE to inset a region
       within a (sub)section.

       .TH topic section [footer-middle] [footer-inside] [header-middle]
              Determine the contents of the page header and footer.  The subject of the man  page
              is  topic and the section of the manual to which it belongs is section.  See man(1)
              or intro(1) for the manual sectioning applicable to your system.  topic and section
              are  positioned  together  at  the  left  and  right in the header (with section in
              parentheses immediately appended to  topic).   footer-middle  is  centered  in  the
              footer.   The arrangement of the rest of the footer depends on whether double-sided
              layout is enabled with the option -rD1.  When disabled (the default), footer-inside
              is  positioned  at the bottom left.  Otherwise, footer-inside appears at the bottom
              left on recto (odd-numbered) pages,  and  at  the  bottom  right  on  verso  (even-
              numbered)  pages.  The outside footer is the page number, except in the continuous-
              rendering mode enabled by the option -rcR=1, in which case  it  is  the  topic  and
              section, as in the header.  header-middle is centered in the header.  If section is
              an integer between 1 and 9 (inclusive), there is no need to specify  header-middle;
              an.tmac  will  supply text for it.  The macro package may also abbreviate topic and
              footer-inside with ellipses if they would overrun the space available in the header
              and footer, respectively.  For HTML output, headers and footers are suppressed.

              Additionally,  this  macro  breaks  the page, resetting the number to 1 (unless the
              -rC1 option is given).  This feature is intended only for formatting  multiple  man
              documents in sequence.

              A  valid  man  document calls .TH once, early in the file, prior to any other macro
              calls.

       .SH [heading-text]
              Set heading-text as a section heading.  If no argument is given, a  one-line  input
              trap  is  planted;  text on the next line becomes heading-text.  The left margin is
              reset to zero to set the heading text in bold (or the font specified by the  string
              HF),  and, on typesetting devices, slightly larger than the base type size.  If the
              heading font \*[HF] is bold, use of an italic style in heading-text  is  mapped  to
              the bold-italic style if available in the font family.  The inset level is reset to
              1, setting the left margin to the value of the IN register.   Text  after  heading-
              text is set as an ordinary paragraph (.P).

              The  content  of  heading-text  and  ordering  of  sections follows a set of common
              practices, as has much of the layout of material within sections.  For  example,  a
              section called “Name” or “NAME” must exist, must be the first section after the .TH
              call, and must contain only text of the form
                     topic[, another-topic]... \- summary-description
              for a man page to be properly indexed.  See groff_man_style(7) for suggestions  and
              man(7) for the conventions prevailing on your system.

       .SS [subheading-text]
              Set  subheading-text as a subsection heading indented between a section heading and
              an ordinary paragraph (.P).  If no argument is given,  a  one-line  input  trap  is
              planted;  text  on the next line becomes subheading-text.  The left margin is reset
              to the value of the SN register to set the  heading  text  in  bold  (or  the  font
              specified  by the string HF).  If the heading font \*[HF] is bold, use of an italic
              style in subheading-text is mapped to the bold-italic style  if  available  in  the
              font  family.   The inset level is reset to 1, setting the left margin to the value
              of the IN register.  Text after subheading-text is set  as  an  ordinary  paragraph
              (.P).

       .EX
       .EE    Begin  and  end  example.   After  .EX,  filling  is  disabled and a constant-width
              (monospaced) font is selected.   Calling  .EE  enables  filling  and  restores  the
              previous font.

              These  macros  are  extensions  introduced in Ninth Edition Research Unix.  Systems
              running that troff, or those from Documenter's  Workbench,  Heirloom  Doctools,  or
              Plan  9  troff  support  them.  To be certain your page will be portable to systems
              that do  not,  copy  their  definitions  from  the  an-ext.tmac  file  of  a  groff
              installation.

       .RS [inset-amount]
              Start  a  new relative inset level.  The position of the left margin is saved, then
              moved right by inset-amount, if specified, and by the amount  of  the  IN  register
              otherwise.   Calls  to .RS can be nested; each increments by 1 the inset level used
              by .RE.  The level prior to any .RS calls is 1.

       .RE [level]
              End a relative inset.  The left  margin  corresponding  to  inset  level  level  is
              restored.  If no argument is given, the inset level is reduced by 1.

   Paragraphing macros
       An  ordinary  paragraph  (.P)  is set without a first-line indentation at the current left
       margin.  In man pages and other technical  literature,  definition  lists  are  frequently
       encountered;  these  can be set as “tagged paragraphs”, which have one (.TP) or more (.TQ)
       leading tags followed by a paragraph that has an  additional  indentation.   The  indented
       paragraph  (.IP)  macro  is useful to continue the indented content of a narrative started
       with .TP, or to present an itemized or ordered list.  All of these macros break the output
       line.  If another paragraph macro has occurred since the previous .SH or .SS, they (except
       for .TQ) follow the break with a default amount of vertical space, which can be changed by
       the  deprecated  .PD  macro; see subsection “Horizontal and vertical spacing” below.  They
       also reset the type size and font style to defaults (.TQ again excepted);  see  subsection
       “Font style macros” below.

       .P
       .LP
       .PP    Begin  a  new  paragraph; these macros are synonymous.  The indentation is reset to
              the default value; the left margin, as affected by .RS and .RE, is not.

       .TP [indentation]
              Set a paragraph with a leading tag, and the remainder of the paragraph indented.  A
              one-line  input trap is planted; text on the next line, which can be formatted with
              a macro, becomes the tag, which is placed at the current left margin.  The tag  can
              be  extended  with  the  \c  escape  sequence.   Subsequent  text  is  indented  by
              indentation, if specified, and by the amount of the IN register otherwise.  If  the
              tag is not as wide as the indentation, the paragraph starts on the same line as the
              tag,  at  the  applicable  indentation,  and  continues  on  the  following  lines.
              Otherwise,  the  descriptive part of the paragraph begins on the line following the
              tag.

       .TQ    Set an additional tag for a paragraph tagged with .TP.  An input trap is planted as
              with .TP.

              This  macro  is  a  GNU  extension  not defined on systems running AT&T, Plan 9, or
              Solaris troff; see an-ext.tmac in section “Files” below.

       .IP [tag] [indentation]
              Set an indented paragraph with an optional tag.  The tag and indentation arguments,
              if  present,  are  handled as with .TP, with the exception that the tag argument to
              .IP cannot include a macro call.

   Command synopsis macros
       .SY and .YS aid  you  to  construct  a  command  synopsis  that  has  the  classical  Unix
       appearance.  They break the output line.

       These  macros  are  GNU extensions not defined on systems running AT&T, Plan 9, or Solaris
       troff; see an-ext.tmac in section “Files” below.

       .SY command
              Begin synopsis.  A new paragraph begins at the left margin unless .SY  has  already
              been  called  without a corresponding .YS, in which case only a break is performed.
              Adjustment and automatic hyphenation are disabled.  command is set in bold.   If  a
              break  is required, lines after the first are indented by the width of command plus
              a space.

       .YS    End synopsis.  Indentation, adjustment,  and  hyphenation  are  restored  to  their
              previous states.

   Hyperlink macros
       Man  page  cross references are best presented with .MR.  Text may be hyperlinked to email
       addresses with .MT/.ME or other URIs with .UR/.UE.  Hyperlinked text is supported on  HTML
       and  terminal  output  devices;  terminals  and  pager programs must support ECMA-48 OSC 8
       escape sequences (see grotty(1)).  When device support is unavailable or disabled with the
       U  register  (see  section  “Options”  below), .MT and .UR URIs are rendered between angle
       brackets after the linked text.

       .MT, .ME, .UR, and .UE are GNU extensions not defined on systems running AT&T, Plan 9,  or
       Solaris  troff;  see an-ext.tmac in section “Files” below.  Plan 9 from User Space's troff
       implements .MR.

       The arguments to .MR, .MT, and .UR should be  prepared  for  typesetting  since  they  can
       appear  in  the  output.   Use  special character escape sequences to encode Unicode basic
       Latin characters where necessary, particularly the hyphen-minus.  The formatter removes \:
       escape sequences from hyperlinks when supplying device control commands to output drivers.

       .MR topic manual-section [trailing-text]
              (since  groff  1.23) Set a man page cross reference as “topic(manual-section)”.  If
              trailing-text  (typically  punctuation)  is  specified,  it  follows  the   closing
              parenthesis  without  intervening  space.   Hyphenation is disabled while the cross
              reference is set.  topic is set in the font specified by the MF string.  The  cross
              reference hyperlinks to a URI of the form “man:topic(manual-section)”.

       .MT address
       .ME [trailing-text]
              Identify address as an RFC 6068 addr-spec for a “mailto:” URI with the text between
              the two macro calls as the link text.  An argument to .ME is placed after the  link
              text  without  intervening  space.   address  may  not  be  visible in the rendered
              document if hyperlinks are enabled and supported by the output driver.  If they are
              not, address is set in angle brackets after the link text and before trailing-text.
              If hyperlinking is enabled but there is no link  text,  address  is  formatted  and
              hyperlinked without angle brackets.

       .UR uri
       .UE [trailing-text]
              Identify uri as an RFC 3986 URI hyperlink with the text between the two macro calls
              as the link text.  An argument to  .UE  is  placed  after  the  link  text  without
              intervening  space.   uri may not be visible in the rendered document if hyperlinks
              are enabled and supported by the output driver.  If they are not,  uri  is  set  in
              angle  brackets  after  the link text and before trailing-text.  If hyperlinking is
              enabled but there is no link text, uri is formatted and hyperlinked  without  angle
              brackets.

       The  hyperlinking  of .TP paragraph tags with .UR/.UE and .MT/.ME is not yet supported; if
       attempted, the hyperlink will be typeset at the beginning of the indented  paragraph  even
       on hyperlink-supporting devices.

   Font style macros
       The  man  macro  package  is limited in its font styling options, offering only bold (.B),
       italic (.I), and roman.  Italic text  is  usually  set  underscored  instead  on  terminal
       devices.   The  .SM  and  .SB macros set text in roman or bold, respectively, at a smaller
       type size; these differ visually from regular-sized roman or bold text only on typesetting
       devices.  It is often necessary to set text in different styles without intervening space.
       The macros .BI, .BR, .IB, .IR, .RB, and .RI,  where  “B”,  “I”,  and  “R”  indicate  bold,
       italic, and roman, respectively, set their odd- and even-numbered arguments in alternating
       styles, with no space separating them.

       The default type size and family for typesetting devices is 10-point Times, except on  the
       X75-12 and X100-12 devices where the type size is 12 points.  The default style is roman.

       .B [text]
              Set  text in bold.  If no argument is given, a one-line input trap is planted; text
              on the next line, which can be further formatted with a macro, is set in bold.

       .I [text]
              Set text in an italic or oblique face.  If no argument is given, a  one-line  input
              trap  is  planted;  text  on  the  next line, which can be further formatted with a
              macro, is set in an italic or oblique face.

       .SM [text]
              Set text one point smaller than the default type size on typesetting  devices.   If
              no  argument  is  given,  a  one-line input trap is planted; text on the next line,
              which can be further formatted with a macro, is set smaller.

       .SB [text]
              Set text in bold and (on typesetting devices) one point smaller  than  the  default
              type  size.  If no argument is given, a one-line input trap is planted; text on the
              next line, which can be further formatted with a macro, is set smaller and in bold.
              This macro is an extension introduced in SunOS 4.0.

       Unlike  the  above font style macros, the font style alternation macros below set no input
       traps; they must be given arguments to have effect.  Italic  corrections  are  applied  as
       appropriate.

       .BI bold-text italic-text ...
              Set each argument in bold and italics, alternately.

       .BR bold-text roman-text ...
              Set each argument in bold and roman, alternately.

       .IB italic-text bold-text ...
              Set each argument in italics and bold, alternately.

       .IR italic-text roman-text ...
              Set each argument in italics and roman, alternately.

       .RB roman-text bold-text ...
              Set each argument in roman and bold, alternately.

       .RI roman-text italic-text ...
              Set each argument in roman and italics, alternately.

   Horizontal and vertical spacing
       The  indentation argument accepted by .IP, .TP, and the deprecated .HP is a number plus an
       optional scaling unit, as is .RS's inset-amount.  If no scaling unit  is  given,  the  man
       package  assumes  “n”.   An indentation specified in a call to .IP, .TP, or the deprecated
       .HP persists until (1) another of these macros is called with an indentation argument,  or
       (2) .SH, .SS, or .P or its synonyms is called; these clear the indentation entirely.

       The  left  margin used by ordinary paragraphs set with .P (and its synonyms) not within an
       .RS/.RE relative inset is 7.2n for typesetting devices and 7n for  terminal  devices  (but
       see  the  -rIN  option).  Headers, footers (both set with .TH), and section headings (.SH)
       are set at the page offset (see groff(7)) and subsection headings (.SS) indented  from  it
       by 3n (but see the -rSN option).

       Several  macros  insert vertical space: .SH, .SS, .TP, .P (and its synonyms), .IP, and the
       deprecated .HP.  The default inter-section  and  inter-paragraph  spacing  is  is  1v  for
       terminal  devices  and 0.4v for typesetting devices.  (The deprecated macro .PD can change
       this vertical spacing, but its use is discouraged.)  Between .EX and .EE calls, the inter-
       paragraph spacing is 1v regardless of output device.

   Registers
       Registers  are  described  in  section  “Options”  below.  They can be set not only on the
       command line but in the site man.local file as well; see section “Files” below.

   Strings
       The following strings are defined for use in man pages.  None of these is necessary  in  a
       contemporary  man page; see groff_man_style(7).  Others are supported for configuration of
       rendering parameters; see section “Options” below.

       \*R    interpolates a special character escape sequence for the “registered  sign”  glyph,
              \(rg, if available, and “(Reg.)” otherwise.

       \*S    interpolates an escape sequence setting the type size to the document default.

       \*(lq
       \*(rq  interpolate  special character escape sequences for left and right double-quotation
              marks, \(lq and \(rq, respectively.

       \*(Tm  interpolates a special character escape sequence for the “trade mark  sign”  glyph,
              \(tm, if available, and “(TM)” otherwise.

   Hooks
       Two  macros, both GNU extensions, are called internally by the groff man package to format
       page headers and footers and can be redefined by the administrator in a  site's  man.local
       file  (see  section  “Files”  below).  The presentation of .TH above describes the default
       headers and footers.  Because these macros are hooks for groff man  internals,  man  pages
       have no reason to call them.  Such hook definitions will likely consist of “.sp” and “.tl”
       requests.  They must also increase the page  length  with  “.pl”  requests  in  continuous
       rendering  mode;  .PT  furthermore has the responsibility of emitting a PDF bookmark after
       writing the first page header in a document.   Consult  the  existing  implementations  in
       an.tmac when drafting replacements.

       .BT    Set the page footer text (“bottom trap”).

       .PT    Set the page header text (“page trap”).

       To  remove  a page header or footer entirely, define the appropriate macro as empty rather
       than deleting it.

   Deprecated features
       Use of the following in man pages for public distribution is discouraged.

       .AT [system [release]]
              Alter the footer for use with legacy AT&T man pages, overriding any  definition  of
              the footer-inside argument to .TH.  This macro exists only to render man pages from
              historical systems.

              system can be any of the following.

                     3      7th edition (default)

                     4      System III

                     5      System V

              The optional release argument  specifies  the  release  number,  as  in  “System  V
              Release 3”.

       .DT    Reset tab stops to the default (every 0.5i).

              Use  of  this  presentation-oriented  macro is deprecated.  It translates poorly to
              HTML, under which exact space control and tabulation  are  not  readily  available.
              Thus,  information  or distinctions that you use tab stops to express are likely to
              be lost.  If you feel tempted to change the tab stops such that calling this  macro
              later  is desirable to restore them, you should probably be composing a table using
              tbl(1) instead.

       .HP [indentation]
              Set up a paragraph with a hanging left indentation.  The indentation  argument,  if
              present, is handled as with .TP.

              Use  of  this  presentation-oriented  macro  is  deprecated.  A hanging indentation
              cannot be expressed naturally under HTML, and non-roff-based man page  interpreters
              may treat .HP as an ordinary paragraph.  Thus, information or distinctions you mean
              to express with indentation may be lost.

       .OP option-name [option-argument]
              Indicate an optional command parameter called option-name, which is  set  in  bold.
              If   the   option   takes  an  argument,  specify  option-argument  using  a  noun,
              abbreviation, or hyphenated noun phrase.  If present, option-argument  is  preceded
              by a space and set in italics.  Square brackets in roman surround both arguments.

              Use  of  this  quasi-semantic  macro,  an  extension  originating  in  Documenter's
              Workbench troff, is deprecated.  It cannot easily be used to annotate options  that
              take optional arguments or options whose arguments have internal structure (such as
              a mixture of literal  and  variable  components).   One  could  work  around  these
              limitations  with font selection escape sequences, but it is preferable to use font
              style alternation macros, which afford greater flexibility.

       .PD [vertical-space]
              Define the vertical  space  between  paragraphs  or  (sub)sections.   The  optional
              argument  vertical-space  specifies  the  amount;  the default scaling unit is “v”.
              Without an argument, the spacing is reset to  its  default  value;  see  subsection
              “Horizontal and vertical spacing” above.

              Use  of  this  presentation-oriented  macro is deprecated.  It translates poorly to
              HTML,  under  which  exact  control  of  inter-paragraph  spacing  is  not  readily
              available.   Thus,  information  or  distinctions  that  you use .PD to express are
              likely to be lost.

       .UC [version]
              Alter the footer for use with legacy BSD man pages, overriding  any  definition  of
              the footer-inside argument to .TH.  This macro exists only to render man pages from
              historical systems.

              version can be any of the following.

                     3      3rd Berkeley Distribution (default)

                     4      4th Berkeley Distribution

                     5      4.2 Berkeley Distribution

                     6      4.3 Berkeley Distribution

                     7      4.4 Berkeley Distribution

   History
       M. Douglas McIlroy ⟨m.douglas.mcilroy@dartmouth.edu⟩ designed, implemented, and documented
       the  AT&T  man macros for Unix Version 7 (1979) and employed them to edit the first volume
       of its Programmer's Manual, a compilation of all man pages supplied by the  system.   That
       man  supported  the  macros listed in this page not described as extensions, except .P and
       the deprecated .AT and .UC.  The only strings defined were R  and  S;  no  registers  were
       documented.

       .UC  appeared  in  3BSD  (1980).   Unix  System  III  (1980) introduced .P and exposed the
       registers IN and LL, which had been internal to Seventh Edition Unix  man.   PWB/UNIX  2.0
       (1980)  added  the  Tm  string.   4BSD  (1980)  added lq and rq strings.  SunOS 2.0 (1985)
       recognized C, D, P, and X registers.  4.3BSD (1986)  added  .AT  and  .P.   Ninth  Edition
       Research Unix (1986) introduced .EX and .EE.  SunOS 4.0 (1988) added .SB.

       The  foregoing  features  were  what  James  Clark implemented in early versions of groff.
       Later, groff 1.20 (2009) originated .SY/.YS, .TQ, .MT/.ME, and .UR/.UE.  Plan 9 from  User
       Space's troff introduced .MR in 2020.

Options

       The  following  groff options set registers (with -r) and strings (with -d) recognized and
       used by the man  macro  package.   To  ensure  rendering  consistent  with  output  device
       capabilities and reader preferences, man pages should never manipulate them.

       -dAD=adjustment-mode
              Set  line  adjustment  to adjustment-mode, which is typically “b” for adjustment to
              both margins (the default), or “l” for left alignment (ragged right  margin).   Any
              valid  argument to groff's “.ad” request may be used.  See groff(7) for less-common
              choices.

       -rcR=1 Enable continuous rendering.  Output is not paginated;  instead,  one  (potentially
              very  long)  page  is produced.  This is the default for terminal and HTML devices.
              Use -rcR=0 to disable it on  terminal  devices;  on  HTML  devices,  it  cannot  be
              disabled.

       -rC1   Number  output  pages  consecutively,  in strictly increasing sequence, rather than
              resetting the page number to 1 (or the value of  register  P)  with  each  new  man
              document.

       -rCS=1 Set   section   headings   (the   argument(s)  to  .SH)  in  full  capitals.   This
              transformation is off by default because it discards case distinction information.

       -rCT=1 Set the man page topic (the first argument to .TH) in full capitals in headers  and
              footers.    This  transformation  is  off  by  default  because  it  discards  case
              distinction information.

       -rD1   Enable double-sided layout, formatting footers for even and odd pages  differently;
              see the description of .TH in subsection “Document structure macros” above.

       -rFT=footer-distance
              Set  distance  of the footer relative to the bottom of the page to footer-distance;
              this amount is always negative.  At one half-inch above  this  location,  the  page
              text  is  broken  before  writing  the  footer.  Ignored if continuous rendering is
              enabled.  The default is -0.5i.

       -dHF=heading-font
              Set the font used for section and subsection headings; the  default  is  “B”  (bold
              style  of  the default family).  Any valid argument to groff's “.ft” request may be
              used.  See groff(7).

       -rHY=0 Disable automatic hyphenation.  Normally, it is enabled (1).  The hyphenation  mode
              is determined by the groff locale; see section “Localization“ of groff(7).

       -rIN=standard-indentation
              Set  the  amount  of indentation used for ordinary paragraphs (.P and its synonyms)
              and the default indentation amount used by .IP, .RS, .TP, and the  deprecated  .HP.
              See  subsection  “Horizontal  and  vertical  spacing”  above  for the default.  For
              terminal devices, standard-indentation should always be an integer multiple of unit
              “n” to get consistent indentation.

       -rLL=line-length
              Set  line  length; the default is 78n for terminal devices and 6.5i for typesetting
              devices.

       -rLT=title-length
              Set the line length for titles.  By default, it is set to the line length (see -rLL
              above).

       -dMF=man-page-topic-font
              Set  the  font  used for man page topics named in .TH and .MR calls; the default is
              “I” (italic style of the default family).  Any  valid  argument  to  groff's  “.ft”
              request  may be used.  If the MF string ends in “I”, it is assumed to be an oblique
              typeface, and italic corrections are applied before and after man page topics.

       -rPn   Start enumeration of pages at n.  The default is 1.

       -rStype-size
              Use type-size for the document's body text; acceptable values are  10,  11,  or  12
              points.  See subsection “Font style macros” above for the default.

       -rSN=subsection-indentation
              Set  indentation  of subsection headings to subsection-indentation.  See subsection
              “Horizontal and vertical spacing” above for the default.

       -rU1   Enable generation of URI hyperlinks in  the  grohtml  and  grotty  output  drivers.
              grohtml  enables  them  by  default; grotty does not, pending more widespread pager
              support for OSC 8 escape sequences.  Use -rU0 to disable hyperlinks; this will make
              the  arguments  to  MT  and UR calls visible in the document text produced by link-
              capable drivers.

       -rXp   Number successors of page p as pa, pb, pc, and so forth.  The register tracking the
              suffixed page letter uses format “a” (see the “.af” request in groff(7)).

Files

       /usr/share/groff/1.23.0/tmac/an.tmac
              Most  man  macros  are  defined  in  this  file.   It  also  loads  extensions from
              an-ext.tmac (see below).

       /usr/share/groff/1.23.0/tmac/andoc.tmac
              This brief groff program detects whether the man or mdoc  macro  package  is  being
              used by a document and loads the correct macro definitions, taking advantage of the
              fact that pages using them must call .TH or .Dd,  respectively,  before  any  other
              macros.   A  man  program or user typing, for example, “groff -mandoc page.1”, need
              not know which package the file page.1 uses.  Multiple man pages, in either format,
              can be handled; andoc reloads each macro package as necessary.

       /usr/share/groff/1.23.0/tmac/an-ext.tmac
              Except  for  .SB, definitions of macros described above as extensions are contained
              in this file; in some cases, they are simpler versions of definitions appearing  in
              an.tmac,  and  are  ignored  if the formatter is GNU troff.  They are written to be
              compatible with AT&T troff and permissively licensed—not copylefted.  To reduce the
              risk  of  name space collisions, string and register names begin only with “m.  We
              encourage man page authors who are  concerned  about  portability  to  legacy  Unix
              systems  to  copy  these  definitions  into  their  pages, and maintainers of troff
              implementations or work-alike systems that format man pages to re-use them.

              The definitions for these macros are read after a page  calls  .TH,  so  they  will
              replace  any  macros  of the same names preceding it in your file.  If you use your
              own implementations of these macros, they must be defined after .TH  is  called  to
              have  any  effect.  Furthermore, it is wise to define such page-local macros (if at
              all)  after  the  “Name”  section  to  accommodate  timid   makewhatis   or   mandb
              implementations that may give up their scan for indexing material early.

       /usr/share/groff/1.23.0/tmac/man.tmac
              This is a wrapper that loads an.tmac.

       /usr/share/groff/1.23.0/tmac/mandoc.tmac
              This is a wrapper that loads andoc.tmac.

       /usr/share/groff/site-tmac/man.local
              Put site-local changes and customizations into this file.

Authors

       The  initial  GNU  implementation  of  the  man  macro package was written by James Clark.
       Later, Werner Lemberg ⟨wl@gnu.org⟩ supplied the S,  LT,  and  cR  registers,  the  last  a
       4.3BSD-Reno  mdoc(7)  feature.   Larry Kollar ⟨kollar@alltel.net⟩ added the FT, HY, and SN
       registers; the HF string; and the PT  and  BT  macros.   G.  Branden  Robinson  ⟨g.branden
       .robinson@gmail.com⟩  implemented  the AD and MF strings; CS, CT, and U registers; and the
       MR macro.  Except for .SB, the extension macros were written by Lemberg, Eric  S.  Raymond
       ⟨esr@thyrsus.com⟩, and Robinson.

       This document was originally written for the Debian GNU/Linux system by Susan G. Kleinmann
       ⟨sgk@debian.org⟩.  It was corrected and updated by Lemberg and  Robinson.   The  extension
       macros were documented by Raymond and Robinson.

See also

       tbl(1),  eqn(1), and refer(1) are preprocessors used with man pages.  man(1) describes the
       man page librarian on your system.  groff_mdoc(7) details the groff version  of  the  BSD-
       originated alternative macro package for man pages.

       groff_man_style(7), groff(7), groff_char(7), man(7)