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(sh-utils.info)id invocation

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`id': Print real and effective uid and gid
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   `id' prints information about the given user, or the process running
it if no user is specified.  Synopsis:

     id [OPTION]... [USERNAME]

   By default, it prints the real user id, real group id, effective
user id if different from the real user id, effective group id if
different from the real group id, and supplemental group ids.

   Each of these numeric values is preceded by an identifying string and
followed by the corresponding user or group name in parentheses.

   The options cause `id' to print only part of the above information.
Also see Note: Common options.

`-g'
`--group'
     Print only the group id.

`-G'
`--groups'
     Print only the supplementary groups.

`-n'
`--name'
     Print the user or group name instead of the ID number.  Requires
     `-u', `-g', or `-G'.

`-r'
`--real'
     Print the real, instead of effective, user or group id.  Requires
     `-u', `-g', or `-G'.

`-u'
`--user'
     Print only the user id.