# xgettext > Extract gettext strings from code files. > More information: <https://www.gnu.org/software/gettext/manual/html_node/xgettext-Invocation.html>. - Scan file and output strings to `messages.po`: `xgettext {{path/to/input_file}}` - Use a different output filename: `xgettext --output {{path/to/output_file}} {{path/to/input_file}}` - Append new strings to an existing file: `xgettext --join-existing --output {{path/to/output_file}} {{path/to/input_file}}` - Don't add a header containing metadata to the output file: `xgettext --omit-header {{path/to/input_file}}`