w - display information about currently logged-in users
w [ -hlsuw ] [ user ]
The w command displays a summary of the current activity on
the system, including what each user is doing. The heading
line shows the current time, the length of time the system
has been up, the number of users logged into the system, and
the average number of jobs in the run queue over the last 1,
5 and 15 minutes.
The fields displayed are: the user's login name, the name of
the tty the user is on, the time of day the user logged on
(in hours:minutes), the idle time-that is, the number of
minutes since the user last typed anything (in
hours:minutes), the CPU time used by all processes and their
children on that terminal (in minutes:seconds), the CPU time
used by the currently active processes (in minutes:seconds),
and the name and arguments of the current process.
-h Suppress the heading.
-l Produce a long form of output, which is the
-s Produce a short form of output. In the short
form, the tty is abbreviated, the login time and
CPU times are left off, as are the arguments to
-u Produces the heading line which shows the current
time, the length of time the system has been up,
the number of users logged into the system, and
the average number of jobs in the run queue over
the last 1, 5 and 15 minutes.
-w Produces a long form of output, which is also the
same as the default.
user Name of a particular user for whom login informa-
tion is displayed. If specified, output is res-
tricted to that user.
10:54am up 27 day(s), 57 mins, 1 user, load average: 0.28, 0.26, 0.22
User tty login@ idle JCPU PCPU what
ralph console 7:10am 1 10:05 4:31 w
See environ(5) for descriptions of the following environment
variables that affect the execution of w: LC_CTYPE,
LC_MESSAGES and LC_TIME.
/var/adm/utmp user and accounting information
ps(1), who(1), whodo(1M), utmp(4), environ(5)
The notion of the ``current process'' is unclear. The
current algorithm is `the highest numbered process on the
terminal that is not ignoring interrupts, or, if there is
none, the highest numbered process on the terminal'. This
fails, for example, in critical sections of programs like
the shell and editor, or when faulty programs running in the
background fork and fail to ignore interrupts. In cases
where no process can be found, w prints -.
The CPU time is only an estimate, in particular, if someone
leaves a background process running after logging out, the
person currently on that terminal is ``charged'' with the
Background processes are not shown, even though they account
for much of the load on the system.
Sometimes processes, typically those in the background, are
printed with null or garbaged arguments. In these cases,
the name of the command is printed in parentheses.
w does not know about the conventions for detecting back-
ground jobs. It will sometimes find a background job
instead of the right one.
Man(1) output converted with