6.1.4 Output file location in update mode

The result is written back to def.po.

`--backup=control'

Make a backup of def.po

`--suffix=suffix'

Override the usual backup suffix.

The version control method may be selected via the --backup option or through the VERSION_CONTROL environment variable. Here are the values:

`none'

`off'

Never make backups (even if --backup is given).

`numbered'

`t'

Make numbered backups.

`existing'

`nil'

Make numbered backups if numbered backups for this file already exist, otherwise make simple backups.

`simple'

`never'

Always make simple backups.

The backup suffix is `~', unless set with --suffix or the SIMPLE_BACKUP_SUFFIX environment variable.