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@example
msggrep [@var{option}] [@var{inputfile}]
@end example
The @code{msggrep} program extracts all messages of a translation catalog
that match a given pattern or belong to some given source files.
@subsection Input file location
@table @samp
@item @var{inputfile}
Input PO file.
@item -D @var{directory}
@itemx --directory=@var{directory}
Add @var{directory} to the list of directories. Source files are
searched relative to this list of directories. The resulting @file{.po}
file will be written relative to the current directory, though.
@end table
If no @var{inputfile} is given or if it is @samp{-}, standard input is read.
@subsection Output file location
@table @samp
@item -o @var{file}
@itemx --output-file=@var{file}
Write output to specified file.
@end table
The results are written to standard output if no output file is specified
or if it is @samp{-}.
@subsection Message selection
@example
[-N @var{sourcefile}]... [-M @var{domainname}]... [-K @var{msgid-pattern}] [-T @var{msgstr-pattern}]
@end example
A message is selected if
@itemize @bullet
@item it comes from one of the specified source files,
@item or if it comes from one of the specified domains,
@item or if @samp{-K} is given and its key (msgid or msgid_plural) matches
@var{msgid-pattern},
@item or if @samp{-T} is given and its translation (msgstr) matches
@var{msgstr-pattern}.
@end itemize
When more than one selection criterion is specified, the set of selected
messages is the union of the selected messages of each criterion.
@var{msgid-pattern} or @var{msgstr-pattern} syntax:
@example
[-E | -F] [-e @var{pattern} | -f @var{file}]...
@end example
@var{pattern}s are basic regular expressions by default, or extended regular
expressions if -E is given, or fixed strings if -F is given.
@table @samp
@item -N @var{sourcefile}
@itemx --location=@var{sourcefile}
Select messages extracted from @var{sourcefile}.
@item -M @var{domainname}
@itemx --domain=@var{domainname}
Select messages belonging to domain @var{domainname}.
@item -K
@itemx --msgid
Start of patterns for the msgid.
@item -T
@itemx --msgstr
Start of patterns for the msgstr.
@item -E
@itemx --extended-regexp
Specify that @var{pattern} is an extended regular expression.
@item -F
@itemx --fixed-strings
Specify that @var{pattern} is a set of newline-separated strings.
@item -e @var{pattern}
@itemx --regexp=@var{pattern}
Use @var{pattern} as a regular expression.
@item -f @var{file}
@itemx --file=@var{file}
Obtain @var{pattern} from @var{file}.
@item -i
@itemx --ignore-case
Ignore case distinctions.
@end table
@subsection Output details
@c --no-escape and --escape omitted on purpose. They are not useful.
@table @samp
@item --force-po
Always write an output file even if it contains no message.
@item --indent
Write the .po file using indented style.
@item --no-location
Do not write @samp{#: @var{filename}:@var{line}} lines.
@item --add-location
Generate @samp{#: @var{filename}:@var{line}} lines (default).
@item --strict
Write out a strict Uniforum conforming PO file. Note that this
Uniforum format should be avoided because it doesn't support the
GNU extensions.
@item -w @var{number}
@itemx --width=@var{number}
Set the output page width. Long strings in the output files will be
split across multiple lines in order to ensure that each line's width
(= number of screen columns) is less or equal to the given @var{number}.
@item --sort-output
Generate sorted output. Note that using this option makes it much harder
for the translator to understand each message's context.
@item --sort-by-file
Sort output by file location.
@end table
@subsection Informative output
@table @samp
@item -h
@itemx --help
Display this help and exit.
@item -V
@itemx --version
Output version information and exit.
@end table
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