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NAME | SYNOPSIS | DESCRIPTION | OPTIONS | DETAILS | EXAMPLES | AUTHORS | SEE ALSO | COLOPHON |
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GROG(1) General Commands Manual GROG(1)
grog - guess options for a following groff command
grog [-C] [-T device] [--run] [--warnings] [--ligatures] [‐
groff-option no arg] [groff-option with arg ...] [--] [filespec
...]
grog -h | --help
grog -v | --version
grog reads the input (file names or standard input) and guesses which
of the groff(1) options are needed to perform the input with the
groff program. A suitable device is now always written as -Tdevice
including the groff default as -T ps.
The corresponding groff command is usually displayed in standard
output. With the option --run, the generated line is output into
standard error and the generated groff command is run on the standard
output. groffer(1) relies on a perfectly running groff(1).
The option -v or --version prints information on the version number.
Also -h or --help prints usage information. Both of these options
automatically end the grog program. Other options are thenignored,
and no groff command line is generated. The following 3 options are
the only grog options,
-C this option means enabling the groff compatibility mode, which
is also transfered to the generated groff command line.
--ligatures
this option forces to include the arguments -P-y -PU within
the generated groff command line.
--run with this option, the command line is output at standard error
and then run on the computer.
--warnings
with this option, some more warnings are output to standard
error.
All other specified short options (words starting with one minus
character -) are interpreted as groff options or option clusters with
or without argument. No space is allowed between options and their
argument. Except from the -marg options, all options will be passed
on, i.e. they are included unchanged in the command for the output
without effecting the work of grog.
A filespec argument can either be the name of an existing file or a
single minus - to mean standard input. If no filespec is specified
standard input is read automatically.
grog reads all filespec parameters as a whole. It tries to guess
which of the following groff options are required for running the
input under groff: -e, -g, -G, -j, -p, -R, -s, -t (preprocessors);
and -man, -mdoc, -mdoc-old, -me, -mm, -mom, and -ms (macro packages).
The guessed groff command including those options and the found
filespec parameters is put on the standard output.
It is possible to specify arbitrary groff options on the command
line. These are passed on the output without change, except for the
-marg options.
The groff program has trouble when the wrong -marg option or several
of these options are specified. In these cases, grog will print an
error message and exit with an error code. It is better to specify
no -marg option. Because such an option is only accepted and passed
when grog does not find any of these options or the same option is
found.
If several different -marg options are found by grog an error message
is produced and the program is terminated with an error code. But
the output is written with the wrong options nevertheless.
Remember that it is not necessary to determine a macro package. A
roff file can also be written in the groff language without any macro
package. grog will produce an output without an -marg option.
As groff also works with pure text files without any roff requests,
grog cannot be used to identify a file to be a roff file.
The groffer(1) program heavily depends on a working grog.
Calling
grog meintro.me
results in
groff -me meintro.me
So grog recognized that the file meintro.me is written with the -me
macro package.
On the other hand,
grog pic.ms
outputs
groff -p -t -e -ms pic.ms
Besides determining the macro package -ms, grog recognized that the
file pic.ms additionally needs -pte, the combination of -p for pic,
-t for tbl, and -e for eqn.
If both of the former example files are combined by the command
grog meintro.me pic.ms
an error message is sent to standard error because groff cannot work
with two different macro packages:
grog: error: there are several macro packages: -me -ms
Additionally the corresponding output with the wrong options is
printed to standard output:
groff -pte -me -ms meintro.me pic.ms
But the program is terminated with an error code. The call of
grog -ksS -Tdvi grnexmpl.g
contains several groff options that are just passed on the output
without any interface to grog. These are the option cluster -ksS
consisting of -k, -s, and -S; and the option -T with argument dvi.
The output is
groff -k -s -S -Tdvi grnexmpl.g
so no additional option was added by grog. As no option -marg was
found by grog this file does not use a macro package.
grog was originally written by James Clark. The current Perl
implementation was written by Bernd Warken ⟨groff-bernd.warken-72@
web.de⟩ with contributions from Ralph Corderoy, and is maintained by
Werner Lemberg ⟨wl@gnu.org⟩.
groff(1), groffer(1)
This page is part of the groff (GNU troff) project. Information
about the project can be found at
⟨http://www.gnu.org/software/groff/⟩. If you have a bug report for
this manual page, see ⟨http://www.gnu.org/software/groff/⟩. This
page was obtained from the project's upstream Git repository
⟨https://git.savannah.gnu.org/git/groff.git⟩ on 2018-02-02. (At that
time, the date of the most recent commit that was found in the repos‐
itory was 2018-02-02.) If you discover any rendering problems in
this HTML version of the page, or you believe there is a better or
more up-to-date source for the page, or you have corrections or
improvements to the information in this COLOPHON (which is not part
of the original manual page), send a mail to man-pages@man7.org
Groff Version 1.22.3 24 November 2017 GROG(1)
Pages that refer to this page: gperl(1), gpinyin(1), groff(1), groffer(1), roff(7)
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