WHO
Section: User Commands (1)
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BSD mandoc
NAME
who
- display who is logged in
SYNOPSIS
who
[am I
]
[file
]
DESCRIPTION
The utility
who
displays
a list of all users currently logged on, showing for each user
the login name,
tty name, the date and time of login, and hostname if not local.
Available options:
- am I
-
Returns the invoker's real user name.
- file
-
By default,
who
gathers information from the file
/var/run/utmp
An alternate
file
may be specified which is usually
/var/run/wtmp
(or
/var/run/wtmp.[0-6]
depending on site policy as
wtmp
can grow quite large and daily versions may or may not
kept around after compression by
ac(8)).
The
wtmp
file contains a record of every login, logout,
crash, shutdown and date change
since
wtmp
was last truncated or
created.
If
/var/log/wtmp
is being used as the file, the user name may be empty
or one of the special characters '|', '}' and '~'. Logouts produce
an output line without any user name. For more information on the
special characters, see
utmp(5).
FILES
- /var/run/utmp
-
- /var/log/wtmp
-
- /var/log/wtmp.[0-6]
-
SEE ALSO
last(1),
users(1),
getuid(2),
utmp(5)
HISTORY
A
who
command appeared in
AT&T System
v6 .
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- FILES
-
- SEE ALSO
-
- HISTORY
-
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Time: 06:31:25 GMT, May 19, 2025