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       grog - guess options for groff command


       [groff-option ...] [filespec ...]  -h | --help -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.  The corresponding groff command is output.


       The  only  grog  options recognized are -C (which is also passed on) to
       enable compatibility mode; -v and --version print  information  on  the
       version  number;  and  -h  and  --help  print  usage  information.  -v,
       --version, -h, and --help stop the program directly without printing  a
       groff command to standard output.

       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, -man, -me, -mm, -mom, -ms, -mdoc, -mdoc-old, -p, -R, -g, -G,
       -s,  and -t.  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

       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.

       The  grog  source  contains  two files written in different programming
       languages: is the Perl version, while is a shell script
       using  BR awk (1).  During the run of make(1), it is determined whether
       the system contains a suitable version of perl(1).  If so,  is
       transformed into grog; otherwise is used instead.


       ·      Calling


              results in

                     groff -me

              So  grog recognized that the file is written with the
              -me macro package.

       ·      On the other hand,



                     groff -pte -ms

              Besides determining the macro package -ms, grog recognized  that
              the  file additionally needs -pte, the combination of -p
              for pic, -t for tbl, and -e for eqn.

       ·      If both files are combined by the command


              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

              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 -ksS -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 can also handle files using the chem language.  The example

                     grog chAh_brackets.chem


                     chem chAh_brackets.chem | groff -pe

              So  chem  is run first and groff is appended.  The option -p for
              pic is implied automatically by chem.   Additionally,  the  file
              uses eqn with -e.


       groff(1),  troff(1), tbl(1), pic(1), eqn(1), refer(1), grn(1), grap(1),
       soelim(1),   groff_me(7),   groff_ms(7),   groff_mm(7),   groff_mom(7),
       groff_man(7), groffer(1)


       Copyright  (C)  1989-2000,  2001,  2002,  2003,  2006,  2007, 2009 Free
       Software Foundation, Inc.   Written  by  James  Clark.   Maintained  by
       Werner Lemberg Rewritten and put under GPL by Bernd Warken.

       This  file  is  part  of  grog, which is part of groff, a free software
       project.  You can redistribute it and/or modify it under the  terms  of
       the  GNU General Public License (GPL) as published by the Free Software
       Foundation, either version 2, or (at your option) any later version.

       You should have received a copy of the GNU General Public License along
       with  groff,  see the files COPYING and LICENSE in the top directory of
       the groff source package.  Or read the man page gpl(1).  You  can  also
       write  to  the  Free Software Foundation, 51 Franklin St - Fifth Floor,
       Boston, MA 02110-1301, USA.