msgcomm - match two message catalogs
msgcomm [OPTION] [INPUTFILE]...
Find messages which are common to two or more of the specified PO files. By
  using the --more-than option, greater commonality may be requested
  before messages are printed. Conversely, the --less-than option may be
  used to specify less commonality before messages are printed (i.e.
  --less-than=2 will only print the unique messages).
  Translations, comments and extract comments will be preserved, but only from
  the first PO file to define them. File positions from all PO files will be
  cumulated.
Mandatory arguments to long options are mandatory for short
    options too.
  - INPUTFILE ...
- input files
- -f, --files-from=FILE
- get list of input files from FILE
- -D, --directory=DIRECTORY
- add DIRECTORY to list for input files search
If input file is -, standard input is read.
  - -o, --output-file=FILE
- write output to specified file
The results are written to standard output if no output file is
    specified or if it is -.
  - -<, --less-than=NUMBER
- print messages with less than this many definitions, defaults to infinite
      if not set
- ->, --more-than=NUMBER
- print messages with more than this many definitions, defaults to 1 if not
      set
- -u, --unique
- shorthand for --less-than=2, requests that only unique
      messages be printed
  - -P, --properties-input
- input files are in Java .properties syntax
- --stringtable-input
- input files are in NeXTstep/GNUstep .strings syntax
  - -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
- -p, --properties-output
- write out a Java .properties file
- --stringtable-output
- write out a NeXTstep/GNUstep .strings 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
- --omit-header
- don't write header with `msgid ""' entry
  - -h, --help
- display this help and exit
- -V, --version
- output version information and exit
Report bugs to <bug-gnu-gettext@gnu.org>.
Copyright © 1995-1998, 2000-2006 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.
The full documentation for msgcomm is maintained as a Texinfo manual. If
  the info and msgcomm programs are properly installed at your
  site, the command
  
  - info msgcomm
should give you access to the complete manual.