id(1) on Linux
The text b5a6330ed1d9, as Debian 2.1 (Slink), Debian 2.0 (Hamm), Debian 1.3 (Bo) shipped it.
print real and effective UIDs and GIDs
Flags it lists
-
--group -
--groups -
--help -
--name -
--real -
--user -
--version -
-G -
-g -
-n -
-r -
-u