# 2.11BSD#431 - /usr/man/cat1/w.0

    W(1)		    UNIX Programmer's Manual		     W(1)

    NAME
         w, uptime	- who is on and what they are doing; system time
         up

    SYNOPSIS
         w [ -hswu ] [ user ]
         uptime

    DESCRIPTION
         W prints a summary of the current activity on the system,
         including what each user is doing.

         The uptime invocation prints only the header line.

         The heading line shows the current time of day, how long the
         system has been up, the number of users logged into the sys-
         tem, 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 abbre-
         viated, the login time and cpu times are left off, as are
         the arguments to commands.

         The -w and -u flags force the w and uptime actions respec-
         tively, regardless of the name the program is invoked as.

         If a user name is included, the output will be restricted to
         that user.

    FILES
         /var/run/utmp	 for login names
         /dev/swap		 secondary storage

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

    Printed 11/26/99						1

    W(1)		    UNIX Programmer's Manual		     W(1)

         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 pro-
         cess can be found, w prints ``-''.)

         The CPU time is only an estimate, in particular, if someone
         leaves a background processs 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.

    Printed 11/26/99						2

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