msguniq

In case you did something to your PO files, that makes them contain duplicate messages, you can use msguniq to unify those duplicates.

NAME
       msguniq - unify duplicate translations in message catalog

SYNOPSIS
       msguniq [OPTION] [INPUTFILE]

DESCRIPTION
       Unifies	duplicate translations in a translation catalog.  Finds dupli-
       cate translations of the same message ID.  Such duplicates are  invalid
       input  for other programs like msgfmt, msgmerge or msgcat.  By default,
       duplicates are merged together.	When using the --repeated option, only
       duplicates  are output, and all other messages are discarded.  Comments
       and extracted comments will be cumulated, except that if --use-first is
       specified,  they	 will be taken from the first translation.  File posi-
       tions will be cumulated.	 When using the	 --unique  option,  duplicates
       are discarded.

       Mandatory  arguments  to	 long  options are mandatory for short options
       too.

   Input file location:
       INPUTFILE
	      input PO file

       -D, --directory=DIRECTORY
	      add DIRECTORY to list for input files search

       If no input file is given or if it is -, standard input is read.

   Output file location:
       -o, --output-file=FILE
	      write output to specified file

       The results are written to standard output if no output file is	speci-
       fied or if it is -.

   Message selection:
       -d, --repeated
	      print only duplicates

       -u, --unique
	      print only unique messages, discard duplicates

   Output details:
       -t, --to-code=NAME
	      encoding for output

       --use-first
	      use  first  available  translation for each message, don't merge
	      several translations

       -e, --no-escape
	      do not use C escapes in output (default)

       -E, --escape
	      use C escapes in output, no extended chars

       --force-po
	      write PO file even if empty

       -i, --indent
	      write the .po file using indented style

       --no-location
	      do not write '#: filename:line' lines

       -n, --add-location
	      generate '#: filename:line' lines (default)

       --strict
	      write out strict Uniforum conforming .po file

       -w, --width=NUMBER
	      set output page width

       --no-wrap
	      do not break long message lines, longer  than  the  output  page
	      width, into several lines

       -s, --sort-output
	      generate sorted output

       -F, --sort-by-file
	      sort output by file location

   Informative output:
       -h, --help
	      display this help and exit

       -V, --version
	      output version information and exit

AUTHOR
       Written by Bruno Haible.

REPORTING BUGS
       Report bugs to <bug-gnu-gettext@gnu.org>.

COPYRIGHT
       Copyright (C) 2001-2002 Free Software Foundation, Inc.
       This is free software; see the source for copying conditions.  There is
       NO warranty; not even for MERCHANTABILITY or FITNESS FOR	 A  PARTICULAR
       PURPOSE.

SEE ALSO
       The  full  documentation for msguniq is maintained as a Texinfo manual.
       If the info and msguniq programs are properly installed at  your	 site,
       the command

	      info msguniq

       should give you access to the complete manual.