better error message if mandocd is not found

[mandoc.git] / mandoc.1

diff --git a/mandoc.1 b/mandoc.1
index 482af608e6b59ed0e0184c5262515dce6dad5614..f7490963b4bdb3498202bf4dddac44523709ef34 100644 (file)
--- a/mandoc.1
+++ b/mandoc.1
@@ -1,7 +1,7 @@
-.\"    $Id: mandoc.1,v 1.225 2018/05/03 14:21:46 schwarze Exp $
+.\" $OpenBSD: mandoc.1,v 1.166 2020/02/15 15:28:01 schwarze Exp $

 .\"
 .\"

+.\" Copyright (c) 2012, 2014-2021 Ingo Schwarze <schwarze@openbsd.org>

 .\" Copyright (c) 2009, 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
 .\" Copyright (c) 2009, 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>

-.\" Copyright (c) 2012, 2014-2018 Ingo Schwarze <schwarze@openbsd.org>

 .\"
 .\" Permission to use, copy, modify, and distribute this software for any
 .\" purpose with or without fee is hereby granted, provided that the above
 .\"
 .\" Permission to use, copy, modify, and distribute this software for any
 .\" purpose with or without fee is hereby granted, provided that the above


@@ -15,7 +15,7 @@
 .\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 .\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 .\"
 .\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 .\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 .\"

-.Dd $Mdocdate: May 3 2018 $
+.Dd $Mdocdate: August 14 2021 $

 .Dt MANDOC 1
 .Os
 .Sh NAME
 .Dt MANDOC 1
 .Os
 .Sh NAME


@@ -52,13 +52,13 @@ The options are as follows:
 If the standard output is a terminal device and
 .Fl c
 is not specified, use
 If the standard output is a terminal device and
 .Fl c
 is not specified, use

-.Xr more 1
+.Xr less 1

 to paginate the output, just like
 .Xr man 1
 would.
 .It Fl c
 Copy the formatted manual pages to the standard output without using
 to paginate the output, just like
 .Xr man 1
 would.
 .It Fl c
 Copy the formatted manual pages to the standard output without using

-.Xr more 1
+.Xr less 1

 to paginate them.
 This is the default.
 It can be specified to override
 to paginate them.
 This is the default.
 It can be specified to override


@@ -222,7 +222,8 @@ reads from standard input.
 .Pp
 The options
 .Fl fhklw
 .Pp
 The options
 .Fl fhklw

-are also supported and are documented in man(1).
+are also supported and are documented in
+.Xr man 1 .

 In
 .Fl f
 and
 In
 .Fl f
 and


@@ -256,10 +257,28 @@ where
 is the back-space character number 8.
 Emboldened characters are rendered as
 .Sq c Ns \e[bs] Ns c .
 is the back-space character number 8.
 Emboldened characters are rendered as
 .Sq c Ns \e[bs] Ns c .

+This markup is typically converted to appropriate terminal sequences by
+the pager or
+.Xr ul 1 .
+To remove the markup, pipe the output to
+.Xr col 1
+.Fl b
+instead.

 .Pp
 The special characters documented in
 .Xr mandoc_char 7
 are rendered best-effort in an ASCII equivalent.
 .Pp
 The special characters documented in
 .Xr mandoc_char 7
 are rendered best-effort in an ASCII equivalent.

+In particular, opening and closing
+.Sq single quotes
+are represented as characters number 0x60 and 0x27, respectively,
+which agrees with all ASCII standards from 1965 to the latest
+revision (2012) and which matches the traditional way in which
+.Xr roff 7
+formatters represent single quotes in ASCII output.
+This correct ASCII rendering may look strange with modern
+Unicode-compatible fonts because contrary to ASCII, Unicode uses
+the code point U+0060 for the grave accent only, never for an opening
+quote.

 .Pp
 The following
 .Fl O
 .Pp
 The following
 .Fl O


@@ -282,14 +301,34 @@ Format
 input files in
 .Xr mdoc 7
 output style.
 input files in
 .Xr mdoc 7
 output style.

-Specifically, this suppresses the two additional blank lines near the
-top and the bottom of each page, and it implies
+This prints the operating system name rather than the page title
+on the right side of the footer line, and it implies

 .Fl O Cm indent Ns =5 .
 One useful application is for checking that
 .Fl T Cm man
 output formats in the same way as the
 .Xr mdoc 7
 source it was generated from.
 .Fl O Cm indent Ns =5 .
 One useful application is for checking that
 .Fl T Cm man
 output formats in the same way as the
 .Xr mdoc 7
 source it was generated from.

+.It Cm tag Ns Op = Ns Ar term
+If the formatted manual page is opened in a pager,
+go to the definition of the
+.Ar term
+rather than showing the manual page from the beginning.
+If no
+.Ar term
+is specified, reuse the first command line argument that is not a
+.Ar section
+number.
+If that argument is in
+.Xr apropos 1
+.Ar key Ns = Ns Ar val
+format, only the
+.Ar val
+is used rather than the argument as a whole.
+This is useful for commands like
+.Ql man -akO tag Ic=ulimit
+to search for a keyword and jump right to its definition
+in the matching manual pages.

 .It Cm width Ns = Ns Ar width
 The output width is set to
 .Ar width
 .It Cm width Ns = Ns Ar width
 The output width is set to
 .Ar width


@@ -308,9 +347,9 @@ Equations rendered from
 .Xr eqn 7
 blocks use MathML.
 .Pp
 .Xr eqn 7
 blocks use MathML.
 .Pp

-The
-.Pa mandoc.css
-file documents style-sheet classes available for customising output.
+The file
+.Pa /usr/share/misc/mandoc.css
+documents style-sheet classes available for customising output.

 If a style-sheet is not specified with
 .Fl O Cm style ,
 .Fl T Cm html
 If a style-sheet is not specified with
 .Fl O Cm style ,
 .Fl T Cm html


@@ -345,7 +384,7 @@ Instances of
 are replaced with the include filename.
 The default is not to present a
 hyperlink.
 are replaced with the include filename.
 The default is not to present a
 hyperlink.

-.It Cm man Ns = Ns Ar fmt
+.It Cm man Ns = Ns Ar fmt Ns Op ; Ns Ar fmt

 The string
 .Ar fmt ,
 for example,
 The string
 .Ar fmt ,
 for example,


@@ -361,12 +400,43 @@ are replaced with the linked manual's name and section, respectively.
 If no section is included, section 1 is assumed.
 The default is not to
 present a hyperlink.
 If no section is included, section 1 is assumed.
 The default is not to
 present a hyperlink.

+If two formats are given and a file
+.Ar %N.%S
+exists in the current directory, the first format is used;
+otherwise, the second format is used.

 .It Cm style Ns = Ns Ar style.css
 The file
 .Ar style.css
 is used for an external style-sheet.
 This must be a valid absolute or
 relative URI.
 .It Cm style Ns = Ns Ar style.css
 The file
 .Ar style.css
 is used for an external style-sheet.
 This must be a valid absolute or
 relative URI.

+.It Cm tag Ns Op = Ns Ar term
+Same syntax and semantics as for
+.Sx ASCII Output .
+This is implemented by passing a
+.Ic file://
+URI ending in a fragment identifier to the pager
+rather than passing merely a file name.
+When using this argument, use a pager supporting such URIs, for example
+.Bd -literal -offset 3n
+MANPAGER='lynx -force_html' man -T html -O tag=MANPAGER man
+MANPAGER='w3m -T text/html' man -T html -O tag=toc mandoc
+.Ed
+.Pp
+Consequently, for HTML output, this argument does not work with
+.Xr more 1
+or
+.Xr less 1 .
+For example,
+.Ql MANPAGER=less man -T html -O tag=toc mandoc
+does not work because
+.Xr less 1
+does not support
+.Ic file://
+URIs.
+.It Cm toc
+If an input file contains at least two non-standard sections,
+print a table of contents near the beginning of the output.

 .El
 .Ss Locale Output
 By default,
 .El
 .Ss Locale Output
 By default,


@@ -397,13 +467,15 @@ This is useful for distributing manual sources to legacy systems
 lacking
 .Xr mdoc 7
 formatters.
 lacking
 .Xr mdoc 7
 formatters.

+Embedded
+.Xr eqn 7
+and
+.Xr tbl 7
+code is not supported.

 .Pp
 If the input format of a file is
 .Xr man 7 ,
 .Pp
 If the input format of a file is
 .Xr man 7 ,

-the input is copied to the output, expanding any
-.Xr roff 7
-.Ic so
-requests.
+the input is copied to the output.

 The parser is also run, and as usual, the
 .Fl W
 level controls which
 The parser is also run, and as usual, the
 .Fl W
 level controls which


@@ -582,7 +654,7 @@ It never affects the interpretation of input files.
 Any non-empty value of the environment variable
 .Ev MANPAGER
 is used instead of the standard pagination program,
 Any non-empty value of the environment variable
 .Ev MANPAGER
 is used instead of the standard pagination program,

-.Xr more 1 ;
+.Xr less 1 ;

 see
 .Xr man 1
 for details.
 see
 .Xr man 1
 for details.


@@ -596,8 +668,7 @@ Specifies the pagination program to use when
 .Ev MANPAGER
 is not defined.
 If neither PAGER nor MANPAGER is defined,
 .Ev MANPAGER
 is not defined.
 If neither PAGER nor MANPAGER is defined,

-.Xr more 1
-.Fl s
+.Xr less 1

 is used.
 Only used if
 .Fl a
 is used.
 Only used if
 .Fl a


@@ -652,7 +723,7 @@ No input files have been read.
 .It 6
 An operating system error occurred, for example exhaustion
 of memory, file descriptors, or process table entries.
 .It 6
 An operating system error occurred, for example exhaustion
 of memory, file descriptors, or process table entries.

-Such errors cause
+Such errors may cause

 .Nm
 to exit at once, possibly in the middle of parsing or formatting a file.
 .El
 .Nm
 to exit at once, possibly in the middle of parsing or formatting a file.
 .El


@@ -667,10 +738,10 @@ To page manuals to the terminal:
 .Dl $ mandoc -l mandoc.1 man.1 apropos.1 makewhatis.8
 .Pp
 To produce HTML manuals with
 .Dl $ mandoc -l mandoc.1 man.1 apropos.1 makewhatis.8
 .Pp
 To produce HTML manuals with

-.Pa mandoc.css
+.Pa /usr/share/misc/mandoc.css

 as the style-sheet:
 .Pp
 as the style-sheet:
 .Pp

-.Dl $ mandoc \-T html -O style=mandoc.css mdoc.7 \*(Gt mdoc.7.html
+.Dl $ mandoc \-T html -O style=/usr/share/misc/mandoc.css mdoc.7 > mdoc.7.html

 .Pp
 To check over a large set of manuals:
 .Pp
 .Pp
 To check over a large set of manuals:
 .Pp


@@ -678,7 +749,7 @@ To check over a large set of manuals:
 .Pp
 To produce a series of PostScript manuals for A4 paper:
 .Pp
 .Pp
 To produce a series of PostScript manuals for A4 paper:
 .Pp

-.Dl $ mandoc \-T ps \-O paper=a4 mdoc.7 man.7 \*(Gt manuals.ps
+.Dl $ mandoc \-T ps \-O paper=a4 mdoc.7 man.7 > manuals.ps

 .Pp
 Convert a modern
 .Xr mdoc 7
 .Pp
 Convert a modern
 .Xr mdoc 7


@@ -688,20 +759,36 @@ format, for use on systems lacking an
 .Xr mdoc 7
 parser:
 .Pp
 .Xr mdoc 7
 parser:
 .Pp

-.Dl $ mandoc \-T man foo.mdoc \*(Gt foo.man
+.Dl $ mandoc \-T man foo.mdoc > foo.man

 .Sh DIAGNOSTICS
 Messages displayed by
 .Nm
 follow this format:
 .Bd -ragged -offset indent
 .Nm :
 .Sh DIAGNOSTICS
 Messages displayed by
 .Nm
 follow this format:
 .Bd -ragged -offset indent
 .Nm :

-.Ar file : Ns Ar line : Ns Ar column : level : message : macro args
+.Ar file : Ns Ar line : Ns Ar column : level : message : macro arguments

 .Pq Ar os
 .Ed
 .Pp
 .Pq Ar os
 .Ed
 .Pp

-Line and column numbers start at 1.
+The first three fields identify the
+.Ar file
+name,
+.Ar line
+number, and
+.Ar column
+number of the input file where the message was triggered.
+The line and column numbers start at 1.

 Both are omitted for messages referring to an input file as a whole.
 Both are omitted for messages referring to an input file as a whole.

-Macro names and arguments are omitted where meaningless.
+All
+.Ar level
+and
+.Ar message
+strings are explained below.
+The name of the
+.Ar macro
+triggering the message and its
+.Ar arguments
+are omitted where meaningless.

 The
 .Ar os
 operating system specifier is omitted for messages that are relevant
 The
 .Ar os
 operating system specifier is omitted for messages that are relevant


@@ -716,6 +803,13 @@ fields.
 .Pp
 Message levels have the following meanings:
 .Bl -tag -width "warning"
 .Pp
 Message levels have the following meanings:
 .Bl -tag -width "warning"

+.It Cm syserr
+An operating system error occurred.
+There isn't necessarily anything wrong with the input files.
+Output may all the same be missing or incomplete.
+.It Cm badarg
+Invalid command line arguments were specified.
+No input files have been read and no output is produced.

 .It Cm unsupp
 An input file uses unsupported low-level
 .Xr roff 7
 .It Cm unsupp
 An input file uses unsupported low-level
 .Xr roff 7


@@ -764,8 +858,7 @@ Messages of the
 .Cm error ,
 and
 .Cm unsupp
 .Cm error ,
 and
 .Cm unsupp

-levels except those about non-existent or unreadable input files
-are hidden unless their level, or a lower level, is requested using a
+levels are hidden unless their level, or a lower level, is requested using a

 .Fl W
 option or
 .Fl T Cm lint
 .Fl W
 option or
 .Fl T Cm lint


@@ -829,14 +922,6 @@ generated by CVS
 or
 .Ic NetBSD
 keyword substitution as conventionally used in these operating systems.
 or
 .Ic NetBSD
 keyword substitution as conventionally used in these operating systems.

-.It Sy "referenced manual not found"
-.Pq mdoc
-An
-.Ic \&Xr
-macro references a manual page that is not found in the base system.
-The path to look for base system manuals is configurable at compile
-time and defaults to
-.Pa /usr/share/man : /usr/X11R6/man .

 .El
 .Ss Style suggestions
 .Bl -ohang
 .El
 .Ss Style suggestions
 .Bl -ohang


@@ -853,6 +938,16 @@ Consider using the conventional
 date format
 .Dq "Month dd, yyyy"
 instead.
 date format
 .Dq "Month dd, yyyy"
 instead.

+.It Sy "normalizing date format to" : No ...
+.Pq mdoc , man
+The
+.Ic \&Dd
+or
+.Ic \&TH
+macro provides an abbreviated month name or a day number with a
+leading zero.
+In the formatted output, the month name is written out in full
+and the leading zero is omitted.

 .It Sy "lower case character in document title"
 .Pq mdoc , man
 The title is still used as given in the
 .It Sy "lower case character in document title"
 .Pq mdoc , man
 The title is still used as given in the


@@ -913,6 +1008,35 @@ list contains two consecutive
 entries describing the same
 .Ic \&Er
 number.
 entries describing the same
 .Ic \&Er
 number.

+.It Sy "referenced manual not found"
+.Pq mdoc
+An
+.Ic \&Xr
+macro references a manual page that was not found.
+When running with
+.Fl W Cm base ,
+the search is restricted to the base system, by default to
+.Pa /usr/share/man : Ns Pa /usr/X11R6/man .
+This path can be configured at compile time using the
+.Dv MANPATH_BASE
+preprocessor macro.
+When running with
+.Fl W Cm style ,
+the search is done along the full search path as described in the
+.Xr man 1
+manual page, respecting the
+.Fl m
+and
+.Fl M
+command line options, the
+.Ev MANPATH
+environment variable, the
+.Xr man.conf 5
+file and falling back to the default of
+.Pa /usr/share/man : Ns Pa /usr/X11R6/man : Ns Pa /usr/local/man ,
+also configurable at compile time using the
+.Dv MANPATH_DEFAULT
+preprocessor macro.

 .It Sy "trailing delimiter"
 .Pq mdoc
 The last argument of an
 .It Sy "trailing delimiter"
 .Pq mdoc
 The last argument of an


@@ -942,6 +1066,9 @@ An
 request occurs even though the document already switched to no-fill mode
 and did not switch back to fill mode yet.
 It has no effect.
 request occurs even though the document already switched to no-fill mode
 and did not switch back to fill mode yet.
 It has no effect.

+.It Sy "input text line longer than 80 bytes"
+Consider breaking the input text line
+at one of the blank characters before column 80.

 .It Sy "verbatim \(dq--\(dq, maybe consider using \e(em"
 .Pq mdoc
 Even though the ASCII output device renders an em-dash as
 .It Sy "verbatim \(dq--\(dq, maybe consider using \e(em"
 .Pq mdoc
 Even though the ASCII output device renders an em-dash as


@@ -995,7 +1122,21 @@ macro lacks the mandatory section argument.
 The section number in a
 .Ic \&Dt
 line is invalid, but still used.
 The section number in a
 .Ic \&Dt
 line is invalid, but still used.

-.It Sy "missing date, using today's date"
+.It Sy "filename/section mismatch"
+.Pq mdoc , man
+The name of the input file being processed is known and its file
+name extension starts with a non-zero digit, but the
+.Ic \&Dt
+or
+.Ic \&TH
+macro contains a
+.Ar section
+argument that starts with a different non-zero digit.
+The
+.Ar section
+argument is used as provided anyway.
+Consider checking whether the file name or the argument need a correction.
+.It Sy "missing date, using \(dq\(dq"

 .Pq mdoc, man
 The document was parsed as
 .Xr mdoc 7
 .Pq mdoc, man
 The document was parsed as
 .Xr mdoc 7


@@ -1596,6 +1737,12 @@ or
 .Cm off .
 The invalid argument is moved out of the macro, which leaves the macro
 empty, causing it to toggle the spacing mode.
 .Cm off .
 The invalid argument is moved out of the macro, which leaves the macro
 empty, causing it to toggle the spacing mode.

+.It Sy "argument contains two font escapes"
+.Pq roff
+The second argument of a
+.Ic char
+request contains more than one font escape sequence.
+A wrong font may remain active after using the character.

 .It Sy "unknown font, skipping request"
 .Pq man , tbl
 A
 .It Sy "unknown font, skipping request"
 .Pq man , tbl
 A


@@ -1622,9 +1769,12 @@ The meaning of blank input lines is only well-defined in non-fill mode:
 In fill mode, line breaks of text input lines are not supposed to be
 significant.
 However, for compatibility with groff, blank lines in fill mode
 In fill mode, line breaks of text input lines are not supposed to be
 significant.
 However, for compatibility with groff, blank lines in fill mode

-are replaced with
+are formatted like

 .Ic \&sp
 requests.
 .Ic \&sp
 requests.

+To request a paragraph break, use
+.Ic \&Pp
+instead of a blank line.

 .It Sy "tab in filled text"
 .Pq mdoc , man
 The meaning of tab characters is only well-defined in non-fill mode:
 .It Sy "tab in filled text"
 .Pq mdoc , man
 The meaning of tab characters is only well-defined in non-fill mode:


@@ -1641,7 +1791,8 @@ Start it on a new input line to help formatters produce correct spacing.
 .It Sy "invalid escape sequence"
 .Pq roff
 An escape sequence has an invalid opening argument delimiter, lacks the
 .It Sy "invalid escape sequence"
 .Pq roff
 An escape sequence has an invalid opening argument delimiter, lacks the

-closing argument delimiter, or the argument has too few characters.
+closing argument delimiter, the argument is of an invalid form, or it is
+a character escape sequence with an invalid name.

 If the argument is incomplete,
 .Ic \e*
 and
 If the argument is incomplete,
 .Ic \e*
 and


@@ -1654,6 +1805,12 @@ and
 .Ic \ew
 to the length of the incomplete argument.
 All other invalid escape sequences are ignored.
 .Ic \ew
 to the length of the incomplete argument.
 All other invalid escape sequences are ignored.

+.It Sy "undefined escape, printing literally"
+.Pq roff
+In an escape sequence, the first character
+right after the leading backslash is invalid.
+That character is printed literally,
+which is equivalent to ignoring the backslash.

 .It Sy "undefined string, using \(dq\(dq"
 .Pq roff
 If a string is used without being defined before,
 .It Sy "undefined string, using \(dq\(dq"
 .Pq roff
 If a string is used without being defined before,


@@ -1717,6 +1874,10 @@ The invalid character is discarded.
 A table layout specification contains an opening parenthesis,
 but no matching closing parenthesis.
 The rest of the input line, starting from the parenthesis, has no effect.
 A table layout specification contains an opening parenthesis,
 but no matching closing parenthesis.
 The rest of the input line, starting from the parenthesis, has no effect.

+.It Sy "ignoring excessive spacing in tbl layout"
+.Pq tbl
+A spacing modifier in a table layout is unreasonably large.
+The default spacing of 3n is used instead.

 .It Sy "tbl without any data cells"
 .Pq tbl
 A table does not contain any data cells.
 .It Sy "tbl without any data cells"
 .Pq tbl
 A table does not contain any data cells.


@@ -1797,6 +1958,13 @@ or
 macro.
 It may be mistyped or unsupported.
 The request or macro is discarded including its arguments.
 macro.
 It may be mistyped or unsupported.
 The request or macro is discarded including its arguments.

+.It Sy "skipping request outside macro"
+.Pq roff
+A
+.Ic shift
+or
+.Ic return
+request occurs outside any macro definition and has no effect.

 .It Sy "skipping insecure request"
 .Pq roff
 An input file attempted to run a shell command
 .It Sy "skipping insecure request"
 .Pq roff
 An input file attempted to run a shell command


@@ -1906,6 +2074,14 @@ When parsing for a request or a user-defined macro name to be called,
 only the escape sequence is discarded.
 The characters preceding it are used as the request or macro name,
 the characters following it are used as the arguments to the request or macro.
 only the escape sequence is discarded.
 The characters preceding it are used as the request or macro name,
 the characters following it are used as the arguments to the request or macro.

+.It Sy "using macro argument outside macro"
+.Pq roff
+The escape sequence \e$ occurs outside any macro definition
+and expands to the empty string.
+.It Sy "argument number is not numeric"
+.Pq roff
+The argument of the escape sequence \e$ is not a digit;
+the escape sequence expands to the empty string.

 .It Sy "NOT IMPLEMENTED: Bd -file"
 .Pq mdoc
 For security reasons, the
 .It Sy "NOT IMPLEMENTED: Bd -file"
 .Pq mdoc
 For security reasons, the


@@ -1934,6 +2110,13 @@ macro fails to specify the list type.
 The argument of a
 .Ic \&ce
 request is not a number.
 The argument of a
 .Ic \&ce
 request is not a number.

+.It Sy "argument is not a character"
+.Pq roff
+The first argument of a
+.Ic char
+request is neither a single ASCII character
+nor a single character escape sequence.
+The request is ignored including all its arguments.

 .It Sy "missing manual name, using \(dq\(dq"
 .Pq mdoc
 The first call to
 .It Sy "missing manual name, using \(dq\(dq"
 .Pq mdoc
 The first call to


@@ -1968,6 +2151,13 @@ or
 .Ic \&gsize
 statement has a non-numeric or negative argument or no argument at all.
 The invalid request or statement is ignored.
 .Ic \&gsize
 statement has a non-numeric or negative argument or no argument at all.
 The invalid request or statement is ignored.

+.It Sy "excessive shift"
+.Pq roff
+The argument of a
+.Ic shift
+request is larger than the number of arguments of the macro that is
+currently being executed.
+All macro arguments are deleted and \en(.$ is set to zero.

 .It Sy "NOT IMPLEMENTED: .so with absolute path or \(dq..\(dq"
 .Pq roff
 For security reasons,
 .It Sy "NOT IMPLEMENTED: .so with absolute path or \(dq..\(dq"
 .Pq roff
 For security reasons,


@@ -2090,6 +2280,13 @@ implementations but not by
 .Nm
 was found in an input file.
 It is replaced by a question mark.
 .Nm
 was found in an input file.
 It is replaced by a question mark.

+.It Sy "unsupported escape sequence"
+.Pq roff
+An input file contains an escape sequence supported by GNU troff
+or Heirloom troff but not by
+.Nm ,
+and it is likely that this will cause information loss
+or considerable misformatting.

 .It Sy "unsupported roff request"
 .Pq roff
 An input file contains a
 .It Sy "unsupported roff request"
 .Pq roff
 An input file contains a


@@ -2117,6 +2314,71 @@ or
 macro or of an undefined macro.
 The macro is ignored, and its arguments are handled
 as if they were a text line.
 macro or of an undefined macro.
 The macro is ignored, and its arguments are handled
 as if they were a text line.

+.It Sy "skipping tbl in -Tman mode"
+.Pq mdoc , tbl
+An input file contains the
+.Ic \&TS
+macro.
+This message is only generated in
+.Fl T Cm man
+output mode, where
+.Xr tbl 7
+input is not supported.
+.It Sy "skipping eqn in -Tman mode"
+.Pq mdoc , eqn
+An input file contains the
+.Ic \&EQ
+macro.
+This message is only generated in
+.Fl T Cm man
+output mode, where
+.Xr eqn 7
+input is not supported.
+.El
+.Ss Bad command line arguments
+.Bl -ohang
+.It Sy "bad command line argument"
+The argument following one of the
+.Fl IKMmOTW
+command line options is invalid, or a
+.Ar file
+given as a command line argument cannot be opened.
+.It Sy "duplicate command line argument"
+The
+.Fl I
+command line option was specified twice.
+.It Sy "option has a superfluous value"
+An argument to the
+.Fl O
+option has a value but does not accept one.
+.It Sy "missing option value"
+An argument to the
+.Fl O
+option has no argument but requires one.
+.It Sy "bad option value"
+An argument to the
+.Fl O
+.Cm indent
+or
+.Cm width
+option has an invalid value.
+.It Sy "duplicate option value"
+The same
+.Fl O
+option is specified more than once.
+.It Sy "no such tag"
+The
+.Fl O Cm tag
+option was specified but the tag was not found in any of the displayed
+manual pages.
+.It Sy "\-Tmarkdown unsupported for man(7) input"
+.Pq man
+The
+.Fl T Cm markdown
+option was specified but an input file uses the
+.Xr man 7
+language.
+No output is produced for that input file.

 .El
 .Sh SEE ALSO
 .Xr apropos 1 ,
 .El
 .Sh SEE ALSO
 .Xr apropos 1 ,