id — print user identity
id
[OPTION
...] [USERNAME
]
Print information for USERNAME, or the current user.
−a
ignore, for compatibility with other versions
−Z
, −−context
print only the security context of the current user
−g
, −−group
print only the effective group ID
−G
, −−groups
print all group IDs
−n
, −−name
print a name instead of a number, for −ugG
−r
, −−real
print the real ID instead of the effective ID, with
−ugG
−u
, −−user
print only the effective user ID
−−help
display this help and exit
−−version
output version information and exit
Without any OPTION, print some useful set of identified information.