id(1)id(1)Nameid - print user and group ID and names
Syntaxid [ -gnru ]
The command writes a message on the standard output giving the user and
group ID and the corresponding names of the invoking process. If the
effective and real IDs do not match, both are printed.
If multiple groups are supported by the underlying system, the supple‐
mentary group affiliations of the invoking process are also written.
When no options are specified, the standard format of output produced
by is uid=%d(%s) gid=%d(%s), <real user id>, <user-name>, <real group
Options-g Outputs only the group ID. The default format is %d\n. This may
be modified by the -n option. The default group ID is the effec‐
tive group ID; this may be modified by the -r option.
-n Outputs the name in the format %s\n instead of the numeric ID
when the -u or -g options are used.
-r Outputs the real ID instead of the effective ID when the -u or
-g options are used. There is no option to produce a list of
supplementary group IDs alone.
-u Outputs only the user ID. The default output format is %d0fP.
This may be modified with the -n option. The default user ID is
the effective user ID; this may be modified by the -r option.
See Alsologname(1), getuid(2)id(1)