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TROFF(1) TROFF(1)

NAME
troff - the troff processor of the groff text formatting system

SYNOPSIS
troff [ -abcivzCERU ] [ -dcs ] [ -ffam ] [ -Fdir ] [ -Idir ] [ -mname ] [ -Mdir ] [ -nnum ]
[ -olist ] [ -rcn ] [ -Tname ] [ -wname ] [ -Wname ] [ files... ]

It is possible to have whitespace between a command line option and its parameter.

DESCRIPTION
This manual page describes the GNU version of troff. It is part of the groff document formatting
system. It is functionally compatible with UNIX troff, but has many extensions, see groff_diff(7).
Usually it should be invoked using the groff(1) command which will also run preprocessors and post-processors postprocessors
processors in the appropriate order and with the appropriate options.

OPTIONS
-a Generate an ASCII approximation of the typeset output.

-b Print a backtrace with each warning or error message. This backtrace should help track
down the cause of the error. The line numbers given in the backtrace may not always be
correct, for troff's idea of line numbers gets confused by as or am requests.

-c Disable color output (always disabled in compatibility mode).

-C Enable compatibility mode.

-dcs
-dname=s Define c or name to be a string s; c must be a one letter name.

-E Inhibit all error messages of troff. Note that this doesn't affect messages output to
standard error by macro packages using the tm or tm1 requests.

-ffam Use fam as the default font family.

-Fdir Search in directory (or directory path) dir for subdirectories devname (name is the name of
the device) and there for the DESC file and font files. dir is scanned before all other
font directories.

-i Read the standard input after all the named input files have been processed.

-Idir This option may be used to specify a directory to search for files (both those on the com-mand command
mand line and those named in .psbb requests). The current directory is always searched
first. This option may be specified more than once; the directories will be searched in
the order specified. No directory search is performed for files specified using an abso-lute absolute
lute path.

-mname Read in the file name.tmac. If it isn't found, try tmac.name instead. It will be first
searched for in directories given with the -M command line option, then in directories
given in the GROFF_TMAC_PATH environment variable, then in the current directory (only if
in unsafe mode), the home directory, /usr/lib/groff/site-tmac, /usr/share/groff/site-tmac,
and /usr/share/groff/1.19.2/tmac.

-Mdir Search directory (or directory path) dir for macro files. This is scanned before all other
macro directories.

-nnum Number the first page num.

-olist Output only pages in list, which is a comma-separated list of page ranges; n means print
page n, m-n means print every page between m and n, -n means print every page up to n, n-means nmeans
means print every page from n. troff will exit after printing the last page in the list.

-rcn
-rname=n Set number register c or name to n; c must be a one character name; n can be any troff
numeric expression.

-R Don't load troffrc and troffrc-end.

-Tname Prepare output for device name, rather than the default ps; see groff(1) for a more
detailed description.

-U Unsafe mode. This will enable the following requests: open, opena, pso, sy, and pi. For
security reasons, these potentially dangerous requests are disabled otherwise. It will
also add the current directory to the macro search path.

-v Print the version number.

-wname Enable warning name. Available warnings are described in the section WARNINGS below. For
example, to enable all warnings, use -w all. Multiple -w options are allowed.

-Wname Inhibit warning name. Multiple -W options are allowed.

-z Suppress formatted output.

WARNINGS
The warnings that can be given by troff are divided into the following categories. The name associ-ated associated
ated with each warning is used by the -w and -W options; the number is used by the warn request, and
by the .warn register; it is always a power of 2 to allow bitwise composition.

break 4 In fill mode, lines which could not be broken so that their length was less than
the line length. This is enabled by default.

char 1 Non-existent characters. This is enabled by default.

color 524288 Color related warnings.

delim 8 Missing or mismatched closing delimiters.

di 256 Use of di or da without an argument when there is no current diversion.

el 16 Use of the el request with no matching ie request.

escape 32768 Unrecognized escape sequences. When an unrecognized escape sequence is encoun-tered, encountered,
tered, the escape character is ignored.

font 131072 Non-existent fonts. This is enabled by default.

ig 262144 Invalid escapes in text ignored with the ig request. These are conditions that
are errors when they do not occur in ignored text.

input 16384 Invalid input characters.

mac 512 Use of undefined strings, macros and diversions. When an undefined string, macro
or diversion is used, that string is automatically defined as empty. So, in most
cases, at most one warning will be given for each name.

missing 8192 Requests that are missing non-optional arguments.

number 2 Invalid numeric expressions. This is enabled by default.

range 64 Out of range arguments.

reg 1024 Use of undefined number registers. When an undefined number register is used,
that register is automatically defined to have a value of 0. So, in most cases,
at most one warning will be given for use of a particular name.

right-brace 4096 Use of \} where a number was expected.

scale 32 Meaningless scaling indicators.

space 65536 Missing space between a request or macro and its argument. This warning will be
given when an undefined name longer than two characters is encountered, and the
first two characters of the name make a defined name. The request or macro will
not be invoked. When this warning is given, no macro is automatically defined.
This is enabled by default. This warning will never occur in compatibility mode.

syntax 128 Dubious syntax in numeric expressions.

tab 2048 Inappropriate use of a tab character. Either use of a tab character where a num-ber number
ber was expected, or use of tab character in an unquoted macro argument.

There are also names that can be used to refer to groups of warnings:

all All warnings except di, mac, and reg. It is intended that this covers all warnings that are
useful with traditional macro packages.

w All warnings.

ENVIRONMENT
GROFF_TMAC_PATH
A colon separated list of directories in which to search for macro files. troff will scan
directories given in the -M option before these, and in standard directories (current direc-tory directory
tory if in unsafe mode, home directory, /usr/lib/groff/site-tmac, /usr/share/groff/site-tmac,
/usr/share/groff/1.19.2/tmac) after these.

GROFF_TYPESETTER
Default device.

GROFF_FONT_PATH
A colon separated list of directories in which to search for the devname directory. troff
will scan directories given in the -F option before these, and in standard directories
(/usr/share/groff/site-font, /usr/share/groff/1.19.2/font, /usr/lib/font) after these.

FILES
/usr/share/groff/1.19.2/tmac/troffrc Initialization file (called before any other macro pack-age). package).
age).

/usr/share/groff/1.19.2/tmac/troffrc-end Initialization file (called after any other macro pack-age). package).
age).

/usr/share/groff/1.19.2/tmac/name.tmac
/usr/share/groff/1.19.2/tmac/tmac.name Macro files

/usr/share/groff/1.19.2/font/devname/DESC Device description file for device name.

/usr/share/groff/1.19.2/font/devname/F Font file for font F of device name.

Note that troffrc and troffrc-end are neither searched in the current nor in the home directory by
default for security reasons (even if the -U option is given). Use the -M command line option or the
GROFF_TMAC_PATH environment variable to add these directories to the search path if necessary.

This document is distributed under the terms of the FDL (GNU Free Documentation License) version 1.1
or later. You should have received a copy of the FDL on your system, it is also available on-line at
the GNU copyleft site <http://www.gnu.org/copyleft/fdl.html>. This document was written by James
Clark, with modifications from

Werner Lemberg <wl@gnu.org> and

Bernd Warken <bwarken@mayn.de>

This document is part of groff, the GNU roff distribution.

SEE ALSO
groff(1)
The main program of the groff system, a wrapper around troff.

groff(7)
A description of the groff language, including a short but complete reference of all prede-fined predefined
fined requests, registers, and escapes of plain groff. From the command line, this is called
by

man 7 groff

groff_diff(7)
The differences of the groff language and the classical troff language. Currently, this is
the most actual document of the groff system.

roff(7)
An overview over groff and other roff systems, including pointers to further related documen-tation. documentation.
tation.

The groff info file, cf. info(1), presents all groff documentation within a single document.

Groff Version 1.19.2 13 October 2003 TROFF(1)

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