

          id options
               This command provides a means of getting, setting and
               converting user, group and process ids.  The id command
               has the following options:

               id user [name]

               id userid [uid]
                    Set the real and effective user ID to name or uid,
                    if the name (or uid) is valid and permissions
                    allow it.  If the name (or uid) is not specified,
                    the current name (or uid) is returned.

               id convert userid uid

               id convert user name
                    Convert a user ID number to a user name, or vice
                    versa.

               id group [name]

               id groupid [gid]
                    Set the real and effective group ID to name or
                    gid, if the name (or gid) is valid and permissions
                    allow it.  If the group name (or gid) is not
                    specified, the current group name (or gid) is
                    returned.

               id convert groupid gid

               id convert group name
                    Convert a group ID number to a group name, or vice
                    versa.

               id effective user

               id effective userid
                    Return the effective user name, or effective user
                    ID number, respectively.

               id effective group

               id effective groupid
                    Return the effective group name, or effective
                    group ID number, respectively.

               id process
                    Return the process ID of the current process.

               id process parent
                    Return the process ID of the parent of the current
                    process.

               id process group
                    Return the process group ID of the current
                    process.

               id process group set
                    Set the process group ID of the current process to
                    its process ID.
