msgcat - combines several message catalogs
msgcat [OPTION] [INPUTFILE]...
Concatenates and merges the specified PO files. 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 cumulated, except that if --use-first is specified, they will
  be taken 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 0 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
  - -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
- -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
  - -h, --help
- display this help and exit
- -V, --version
- output version information and exit
Report bugs to <bug-gnu-gettext@gnu.org>.
Copyright © 2001-2006 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 msgcat is maintained as a Texinfo manual. If
  the info and msgcat programs are properly installed at your
  site, the command
  
  - info msgcat
should give you access to the complete manual.