W(1)W(1)NAMEw - who is on and what they are doing
SYNOPSISw [ -h ] [ -s ] [ user ]
DESCRIPTION
W prints a summary of the current activity on the system, including
what each user is doing. The heading line shows the current time of
day, how long the system has been up, the number of users logged into
the system, and the load averages. The load average numbers give the
number of jobs in the run queue averaged over 1, 5 and 15 minutes.
The fields output are: the users login name, the name of the tty the
user is on, the time of day the user logged on, the number of minutes
since the user last typed anything, the CPU time used by all processes
and their children on that terminal, the CPU time used by the currently
active processes, the name and arguments of the current process.
The -h flag suppresses the heading. The -s flag asks for 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 commands. -l gives
the long output, which is the default.
If a user name is included, the output will be restricted to that user.
FILES
/etc/utmp
/dev/kmem
/dev/drum
SEE ALSOwho(1), finger(1), ps(1)AUTHOR
Mark Horton
BUGS
The notion of the ``current process'' is muddy. 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 time.
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 new conventions for detection of background
jobs. It will sometimes find a background job instead of the right
one.
4th Berkeley Distribution April 29, 1985 W(1)