grog(1) — Linux manual page

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grog(1)                  General Commands Manual                 grog(1)

Name         top

       grog - “groff guess”—infer a document's groff command

Synopsis         top

       grog [--run] [--warnings] [--ligatures] [groff-option ...] [--]
            [file ...]

       grog -h
       grog --help

       grog -v
       grog --version

Description         top

       grog reads the input (file names or standard input) and guesses
       which groff(1) options are needed to render the input with the
       groff program.  If no operands are given, or if file is “-”, grog
       reads the standard input stream.  The corresponding groff command
       is normally written to the standard output stream.  With the
       option --run, the generated command is written to the standard
       error stream and then executed.

Options         top

       -h and --help display a usage message, whereas -v and --version
       display version information; all exit afterward.

              forces inclusion of the arguments -P-y -PU in the
              generated groff command.

       --run  writes the inferred command to the standard error stream
              and then executes it.

              issues more warnings to the standard error stream.

       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
       such an option and its argument when it is specified to grog;
       this is not the case for groff itself.  Except for -m, these
       options are passed through; that is, they are included unchanged
       in the output command without affecting the work of grog.

Details         top

       grog reads all file operands in their entirety, pattern-matching
       strings that are statistically likely to be characteristic of
       roff(7) documents.  It tries to guess which of the following
       groff options are required to correctly render the input: -e, -g,
       -G, -j, -p, -R, -s, -t (preprocessors); and -man, -mdoc,
       -mdoc-old, -me, -mm, -mom, and -ms (macro packages).  The
       inferred groff command including those options and any file
       parameters is written to the standard output stream.

       It is possible to specify arbitrary groff options on the command
       line.  These are included in the inferred command without change,
       except for the -m options.  Choices of groff options include -C
       to enable compatibility mode and -T to specify an output device
       other than the default.

       groff may issue diagnostic messages when an inappropriate -m
       option, or multiple conflicting ones, are specified.
       Consequently, it is best to specify no -m options to grog unless
       it cannot correctly infer any -m arguments at all.  grog will
       only accept -m arguments and exit successfully if it can infer no
       groff -m argument from the input or if the inferred and specified
       -m arguments agree.

       If multiple -m options are inferred by grog, it emits a
       diagnostic and terminates with an error exit status.  The
       inferred command is written with the wrong options nevertheless.

       A roff document can also be written without recourse to any macro
       package.  In such cases, grog will infer a groff command without
       an -m option.

Examples         top

       at the command line results in
              groff -T ps -me
       because grog recognizes that the file is written using
       macros from the me package.  The command
              groff -T ps -t -e -p -ms
       on the other hand.  Besides discerning the ms macro package, grog
       recognizes that the file 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 in the command
       a diagnostic message is sent to the standard error stream because
       some macro packages cannot be combined.  Nevertheless the
       corresponding output with the wrong options is written to
       standard output:
              groff -T ps -t -e -p -ms
       and grog terminates with an error exit status.

       The command
              grog -ksS -Tdvi grnexmpl.g
       contains several groff options that are passed through without
       interference from grog.  These are the option cluster -ksS and
       the typesetter option -T with argument dvi.  The output is
              groff -k -s -S -T dvi grnexmpl.g
       so no additional option was added by grog.  As no -m option was
       inferred by grog, this file does not use a macro package.

Authors         top

       grog was originally written by James Clark.  The current Perl
       implementation was written by Bernd Warken ⟨groff-bernd⟩ with contributions from Ralph Corderoy.

See also         top


COLOPHON         top

       This page is part of the groff (GNU troff) project.  Information
       about the project can be found at 
       ⟨⟩.  If you have a bug report
       for this manual page, see ⟨⟩.
       This page was obtained from the project's upstream Git repository
       ⟨⟩ on 2021-04-01.  (At
       that time, the date of the most recent commit that was found in
       the repository was 2021-03-29.)  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

groff 1.23.0.rc1.259-531129-dir1t3yMarch 2021                      grog(1)

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