usermod(8) on Linux
The text 7eb4c35e60cc, as Debian 3.1 (Sarge) shipped it.
Modify a user account
Flags it lists
-
-G -
-L -
-U -
-c -
-d -
-e -
-f -
-g -
-l -
-o -
-p -
-s -
-u