id(1)                                                                 id(1)

NAME
     id - print user and group IDs and names

SYNOPSIS
     id [option ...] [username]

DESCRIPTION
     id writes the following on the standard output for the invoking pro-
     cess:

     -  the user ID (UID)

     -  the login name

     -  the group ID (GID)

     -  the group name.

     If the effective and real IDs/names are not identical, both are
     printed.

   Interaction with su

     id reports information on the current login name. Thus, if you enter
     id after using the su command to switch login names (i.e. become
     another user), id will print information on your new name.

     The who and who am i commands, by contrast, always return information
     on the name under which you originally logged in.

OPTIONS
     The options -G, -g, and -u cannot be combined.

     No option specified
          In addition to the ID and login name of the user, id reports all
          the groups to which the invoking process belongs and all the
          groups to which the invoking user belongs.

          This is equivalent to the old option -a, which will continue to
          be supported.

     -G   id outputs all group numbers.

     -g   id outputs only the effective group numbers.

     -n   The corresponding names are output instead of numbers.

     -r   The real ID is output instead of the effective ID. -r cannot be
          combined with -G.

     -u   id outputs only the effective user numbers.




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id(1)                                                                 id(1)

     --   If username begins with a dash (-), the end of the command-line
          options must be marked with --.

     username
          id outputs information on the specified user.

EXAMPLES
     To check your current user ID, group ID, and their corresponding
     names, you enter:

          $ id

     id might then report the following:

          uid=115(phil)            gid=1(other)

LOCALE
     The LCMESSAGES environment variable governs the language in which
     message texts are displayed. If LCMESSAGES is undefined or is defined
     as the null string, it defaults to the value of LANG. If LANG is like-
     wise undefined or null, the system acts as if it were not internation-
     alized.

     The LCALL environment variable governs the entire locale. LCALL
     takes precedence over all the other environment variables which affect
     internationalization.

FILES
     /etc/passwd
          Password file containing login names and, among other things, the
          associated user and group IDs.

     /etc/group
          Group file containing group names and the associated group IDs
          and login names.

SEE ALSO
     logname(1), newgrp(1), su(1), who(1), getuid(2).
















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