-c, --check
perform all the checks implied by --check-format, --check-header, --check-domain
--check-format
check language dependent format strings
--check-header
verify presence and contents of the header entry
--check-domain
check for conflicts between domain directives and the --output-file option
-C, --check-compatibility
check that GNU msgfmt behaves like X/Open msgfmt
--check-accelerators[=CHAR]
check presence of keyboard accelerators for menu items
-f, --use-fuzzy
use fuzzy entries in output