id(1) on Linux
The text 707a1a80afb2, as Debian 8 (Jessie) shipped it.
print real and effective user and group IDs
Flags it lists
-
--context -
--group -
--groups -
--help -
--name -
--real -
--user -
--version -
--zero -
-G -
-Z -
-a -
-g -
-n -
-r -
-u -
-z