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W(1)                      BSD General Commands Manual                     W(1)

NAME
     w -- display who is logged in and what they are doing

SYNOPSIS
     w [-hin] [user ...]

DESCRIPTION
     The w utility prints a summary of the current activity on the system, including what each user is
     doing.  The first line displays the current time of day, how long the system has been running, the num-ber number
     ber 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 user's login name, the name of the terminal the user is on, the host from
     which the user is logged in, the time the user logged on, the time since the user last typed anything,
     and the name and arguments of the current process.

     The options are as follows:

     -h      Suppress the heading.

     -i      Output is sorted by idle time.

     If one or more user names are specified, the output is restricted to those users.

COMPATIBILITY
     The -M, -d, -f, -l, -n, -s, and -w flags are no longer supported.

SEE ALSO
     finger(1), ps(1), uptime(1), who(1)

HISTORY
     The w command appeared in 3.0BSD.

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.

     The w utility does not know about the new conventions for detection of background jobs.  It will some-times sometimes
     times find a background job instead of the right one.

     Long hostnames and IPv6 addresses may be truncated; however, the who(1) utility will display full host-names. hostnames.
     names.

BSD                              June 6, 1993                              BSD