When invoked without arguments, locale summarizes the current locale environment for each locale category defined by the LC_* environment variables.
-a, --all-locales
Write names of available locales.
-m, --charmaps
Write names of available charmaps.
Write names of selected categories.
-k, --keyword-name
Write names and values of selected keywords.
Character classification and case conversion.
LC_COLLATE
Collation order.
LC_TIME
Date and time formats.
LC_NUMERIC
Non-monetary numeric formats.
LC_MONETARY
Monetary formats.
LC_MESSAGES
This manpage is written by Joel Klecker <espy@debian.org> for the Debian GNU/Linux system.