This directory of Linux commands is from Linux in a Nutshell, 5th Edition.
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groff
groff [options] [files] troff [options] [files]
Frontend to the groff document-formatting system, which normally runs troff along with a postprocessor appropriate for the selected output device. Options without arguments can be grouped after a single dash (-). A filename of - denotes standard input.
Options
Generate an ASCII approximation of the typeset output.
Print a backtrace.
Enable compatibility mode.
Define the character c or string name to be the string s.
Preprocess with eqn, the equation formatter.
Don't print any error messages.
Use fam as the default font family.
Search dir for subdirectories with DESC and font files before searching the default directory
/usr/lib/groff/font .
Print a help message.
Read standard input after all files have been processed.
Send the output to a print spooler (as specified by the print command in the device description file).
Pass arg to the spooler. Each argument should be passed with a separate -L option.
Read the macro file tmac.name.
Search directory dir for macro files before searching the default directory
/usr/lib/groff/tmac .
Set the first page number to num.
Don't allow newlines with eqn delimiters; equivalent to eqn's -N option.
Output only pages specified in list, a comma-separated list of page ranges.
Preprocess with pic.
Pass arg to the postprocessor. Each argument should be passed with a separate -P option.
Set the number register c or name to n. c is a single character, and n is any troff numeric expression.
Preprocess with refer.
Preprocess with soelim.
Use safer mode (that is, pass the -S option to pic and use the -msafer macros with troff).
Preprocess with tbl.
Prepare output for device dev; the default is ps.
Make programs run by groff print out their version number.
Print the pipeline on stdout instead of executing it.
Enable warning name. You can specify multiple -w options. See the troff manpage for a list of warnings.
Disable warning name. You can specify multiple -W options. See the troff manpage for a list of warnings.
Suppress troff output (except error messages).
Do not postprocess troff output. Normally groff automatically runs the appropriate postprocessor.
Devices
Typewriter-like device.
T
E X dvi format.
Typewriter-like devices using the ISO Latin-1 character set.
PostScript.
75-dpi X11 previewer.
100-dpi X11 previewer.
HP LaserJet4-compatible (or other PCL5-compatible) printer.
Environment variables
If set to be X, groff will run Xtroff instead of troff.
Colon-separated list of directories in which to search for the devname directory.
Colon-separated list of directories in which to search for the macro files.
If set, temporary files will be created in this directory; otherwise, they will be created in TMPDIR (if set) or /tmp (if TMPDIR is not set).
Default device.
Search path for commands that groff executes.
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