The xgettext utility is used to automate the creation of portable message files (.po). A .po file contains copies of "C" strings
that are found in ANSI C source code in filename or the standard input if `-' is specified on the command line. The .po file can
be used as input to the msgfmt(1) utility, which produces a binary form of the message file
that can be used by application during run-time.
xgettext writes msgid strings from gettext(3C) calls in filename to the default output file messages.po. The default output file name can be changed by -d
option. msgid strings in dgettext() calls are written to the output file domainname.po where domainname
is the first parameter to the dgettext() call.
By default, xgettext creates a .po file in the current working directory, and each entry is in the same order that the strings are extracted from filenames. When the -p option is specified, the .po file is created in the pathname directory. An existing .po
file is overwritten.
Duplicate msgids are written to the .po file as comment lines. When the -s option is specified, the .po is sorted
by the msgid string, and all duplicated msgids are removed. All msgstr directives in the .po file are
empty unless the -m option is used.
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