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ID(1) FreeBSD General Commands Manual ID(1)
NAME
id - return user identity
SYNOPSIS
id [user]
id -A
id -G [-n] [user]
id -M
id -P [user]
id -c
id -g [-nr] [user]
id -p [user]
id -u [-nr] [user]
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 user (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:
-A Display the process audit user ID and other process audit
properties, which requires privilege.
-G Display the different group IDs (effective, real and
supplementary) as white-space separated numbers, in no particular
order.
-M Display the MAC label of the current process.
-P Display the id as a password file entry.
-a Ignored for compatibility with other id implementations.
-c Display current login class.
-g Display the effective group ID as a number.
-n Display the name of the user or group ID for the -G, -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 effective 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,
EXIT STATUS
The id utility exits 0 on success, and >0 if an error occurs.
EXAMPLES
Show information for the user `bob' as a password file entry:
$ id -P bob
bob:*:0:0::0:0:Robert:/bob:/usr/local/bin/bash
Same output as groups(1) for the root user:
$ id -Gn root
wheel operator
Show human readable information about `alice':
$ id -p alice
uid alice
groups alice webcamd vboxusers
Assuming the user `bob' executed "su -l" to simulate a root login,
compare the result of the following commands:
# id -un
root
# who am i
bob pts/5 Dec 4 19:51
SEE ALSO
groups(1), who(1)
STANDARDS
The id function is expected to conform to IEEE Std 1003.2 ("POSIX.2").
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 appeared in 4.4BSD.
FreeBSD 14.0-RELEASE-p11 March 5, 2011 FreeBSD 14.0-RELEASE-p11