


ID(1)		    UNIX Programmer's Manual		    ID(1)



NAME
     id - return user identity

SYNOPSIS
     id [_u_s_e_r]
     id -G [-n] [_u_s_e_r]
     id -g [-nr] [_u_s_e_r]
     id -p
     id -u [-nr] [_u_s_e_r]

DESCRIPTION
     The id utility displays the user and group names and numeric
     IDs, of the calling process, to the standard output.  If the
     real and effective IDs are different, both are displayed,
     otherwise only the real ID is displayed.

     If a _u_s_e_r (login name or user ID) is specified, the user and
     group IDs of that user are displayed.  In this case, the
     real and effective IDs are assumed to be the same.

     The options are as follows:

     -G        Display the different group IDs (effective, real
	       and supplementary) as white-space separated
	       numbers, in no particular order.

     -g        Display the effective group ID as a number.

     -n        Display the name of the user or group ID for the
	       -GP, -g and -u options instead of the number.  If
	       any of the ID numbers cannot be mapped into names,
	       the number will be displayed as usual.

     -p        Make the output human-readable.	If the user name
	       returned by getlogin(2) is different from the
	       login name referenced by the user ID, the name
	       returned by getlogin(2) is displayed, preceded by
	       the keyword ``login''.  The user ID as a name is
	       displayed, preceded by the keyword ``uid''.  If
	       the effective user ID is different from the real
	       user ID, the real user ID is displayed as a name,
	       preceded by the keyword ``euid''.  If the effec-
	       tive group ID is different from the real group ID,
	       the real group ID is displayed as a name, preceded
	       by the keyword ``rgid''.  The list of groups to
	       which the user belongs is then displayed as names,
	       preceded by the keyword ``groups''.  Each display
	       is on a separate line.

     -r        Display the real ID for the -g and -u options
	       instead of the effective ID.




Printed 11/26/99	  June 25, 1997                         1






ID(1)		    UNIX Programmer's Manual		    ID(1)



     -u        Display the effective user ID as a number.

     The id utility exits 0 on success, and >0 if an error
     occurs.

SEE ALSO
     who(1)

STANDARDS
     The id function is expected to conform to IEEE Std1003.2
     (``POSIX'').

HISTORY
     The historic groups(1) command is equivalent to ``id -Gn
     [user]''.

     The historic whoami(1) command is equivalent to ``id -un''.

     The id command first appeared in 4.4BSD.




































Printed 11/26/99	  June 25, 1997                         2



