id(1M)
NAME
id - return user identity
SYNOPSIS
/usr/bin/id [-p] [user]
/usr/bin/id -a [-p] [user]
/usr/xpg4/bin/id [-p] [user]
/usr/xpg4/bin/id -G [-n] [user]
/usr/xpg4/bin/id -g [-nr] [user]
/usr/xpg4/bin/id -u [-nr] [user]
DESCRIPTION
If no user operand is provided, the id utility writes the
user and group IDs and the corresponding user and group
names of the invoking process to standard output. If the
effective and real IDs do not match, both are written. If
multiple groups are supported by the underlying system,
/usr/xpg4/bin/id also writes the supplementary group affili-
ations of the invoking process.
If a user operand is provided and the process has the
appropriate privileges, the user and group IDs of the
selected user are written. In this case, effective IDs are
assumed to be identical to real IDs. If the selected user
has more than one allowable group membership listed in the
group database, /usr/xpg4/bin/id writes them in the same
manner as the supplementary groups described in the preced-
ing paragraph.
Formats
The following formats are used when the LC_MESSAGES locale
category specifies the "C" locale. In other locales, the
strings uid, gid, euid, egid, and groups may be replaced
with more appropriate strings corresponding to the locale.
"uid=%u(%s) gid=%u(%s)\n" <real user ID>, <user-name>,
<real group ID>, <group-name>
If the effective and real user IDs do not match, the follow-
ing are inserted immediately before the \n character in the
previous format:
" euid=%u(%s)"
with the following arguments added at the end of the argu-
ment list:
<effective user ID>, <effective user-name>
If the effective and real group IDs do not match, the fol-
lowing is inserted directly before the \n character in the
format string (and after any addition resulting from the
effective and real user IDs not matching):
" egid=%u(%s)"
with the following arguments added at the end of the argu-
ment list:
<effectivegroup-ID>, <effectivegroupname>
If the process has supplementary group affiliations or the
selected user is allowed to belong to multiple groups, the
first is added directly before the NEWLINE character in the
format string:
" groups=%u(%s)"
with the following arguments added at the end of the argu-
ment list:
<supplementary group ID>, <supplementary group name>
and the necessary number of the following added after that
for any remaining supplementary group IDs:
",%u(%s)"
and the necessary number of the following arguments added at
the end of the argument list:
<supplementary group ID>, <supplementary group name>
If any of the user ID, group ID, effective user ID, effec-
tive group ID or supplementary/multiple group IDs cannot be
mapped by the system into printable user or group names, the
corresponding (%s) and name argument is omitted from the
corresponding format string.
When any of the options are specified, the output format is
as described under OPTIONS.
OPTIONS
The following option is supported by both /usr/bin/id and
/usr/xpg4/bin/id. For /usr/xpg4/bin/id, -p is invalid if
specified with any of the -G, -g, or -u options.
-p Reports additionally the current project member-
ship of the invoking process. The project is
reported using the format:
"projid=%u(%s)"
which is inserted prior to the 0haracter of the
default format described in the Formats section.
The arguments
<project ID>,<project name>
are appended to the end of the argument list. If
the project ID cannot be mapped by the system
into a printable project name, the corresponding
(%s) and name argument is omitted from the
corresponding format string.
/usr/bin/id
The following option is supported for /usr/bin/id only:
-a Reports user name, user ID and all the groups to
which the user belongs.
/usr/xpg4/bin/id
The following options are supported for /usr/xpg4/bin/id
only:
-G Outputs all different group IDs (effective, real and
supplementary) only, using the format "%u\n". If there
is more than one distinct group affiliation, output
each such affiliation, using the format " %u", before
the NEWLINE character is output.
-g Outputs only the effective group ID, using the format
"%u\n".
-n Outputs the name in the format "%s" instead of the
numeric ID using the format "%u".
-r Outputs the real ID instead of the effective ID.
-u Outputs only the effective user ID, using the format
"%u\n".
OPERANDS
The following operand is supported:
user The user (login) name for which information is to be
written.
ENVIRONMENT VARIABLES
See environ(5) for descriptions of the following environment
variables that affect the execution of id: LANG, LC_ALL,
LC_CTYPE, LC_MESSAGES, and NLSPATH.
EXIT STATUS
The following exit values are returned:
0 Successful completion.
>0 An error occurred.
ATTRIBUTES
See attributes(5) for descriptions of the following attri-
butes:
/usr/bin/id
____________________________________________________________
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
|_____________________________|_____________________________|
| Availability | SUNWcsu, SUNWcar |
|_____________________________|_____________________________|
/usr/xpg4/bin/id
____________________________________________________________
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
|_____________________________|_____________________________|
| Availability | SUNWxcu4 |
|_____________________________|_____________________________|
| Interface Stability | Standard |
|_____________________________|_____________________________|
SEE ALSO
fold(1), logname(1), who(1), getgid(2), getgroups(2), get-
projid(2), getuid(2), attributes(5), environ(5), stan-
dards(5)
NOTES
Output produced by the -G option and by the default case
could potentially produce very long lines on systems that
support large numbers of supplementary groups.
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