id(1)id(1)NAMEid - Displays the user's system identity
id-G [-n] [user]
id-g [-nr] [user]
id-u [-nr] [user]
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Displays all groups ids (real, effective, and supplementary) only, as
unsigned decimal numbers. Displays only the effective group id as an
unsigned decimal number. Displays user and group names as strings
rather than as numbers. Displays only the real ID. Displays only the
effective user ID as an unsigned decimal number. [Tru64 UNIX] Dis‐
plays user and all group IDs and names if the environment variable
CMD_ENV is set to the string svr4.
The user for whom information is to be written.
If this parameter is omitted, the user and group names associ‐
ated with the invoking process are used.
The id command writes to standard output a message containing the user
and group IDs and corresponding names of the invoking process. If
effective names and IDs do not match the real ones, the id command
If user is specified and the invoking process has sufficient privi‐
leges, the IDs and names in the message are for user rather than for
the invoking process. Effective IDs are assumed identical to real IDs.
Your real user and group ids are specified in the /etc/passwd file and
are your user and group ids on login. You can change your active group
with the newgrp shell command (see newgrp(1)) if additional groups are
specified for you in the /etc/group file. Such groups are called sup‐
A process can also have an effective user or group id set when a set-
user- or set-group-identifier program is executed. See setuid(2), set‐
[Tru64 UNIX] When the environment variable CMD_ENV is set to the
string svr4, the command syntax and output is compatible with the SVID
standard. In particular, the id command with no options displays the
user's name and id and the real and effective group names and ids. The
-a option adds any supplementary group names and ids to the display.
The following exit values are returned: Successful completion. An
To display your user and group IDs, enter: id
Information is displayed similar to: uid=200(thomas)
In the case where a user belongs to a supplementary group,
information is displayed similar to: uid=200(thomas)
However, if the environment variable CMD_ENV is set to the
string svr4, the command id with no options does not display any
supplementary groups and results in a display similar to:
uid=200(thomas) gid=1(staff) To display supplementary groups
with CMD_ENV set to svr4, use the command id-a. The display is
then similar to: uid=200(thomas) gid=1(staff)
The following environment variables affect the execution of id: [Tru64
UNIX] When this environment variable CMD_ENV is set to the string
svr4, the command syntax and output is compatible with the SVID stan‐
dard. The -a option is only available in this condition. Provides a
default value for the internationalization variables that are unset or
null. If LANG is unset or null, the corresponding value from the
default locale is used. If any of the internationalization variables
contain an invalid setting, the utility behaves as if none of the vari‐
ables had been defined. If set to a non-empty string value, overrides
the values of all the other internationalization variables. Determines
the locale for the interpretation of sequences of bytes of text data as
characters (for example, single-byte as opposed to multibyte characters
in arguments). Determines the locale for the format and contents of
diagnostic messages written to standard error. Determines the location
of message catalogues for the processing of LC_MESSAGES.
Group names declared on the system. Password file.
Commands: groups(1), logname(1), newgrp(1), who(1)
Functions: getgid(2), getuid(2), setgid(2), setuid(2)
Files: group(4), passwd(4)