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W(1)                        General Commands Manual                       W(1)

       w - who is logged in, and what are they doing

       w [ -hls ] [ user ]

       w  displays  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 displayed are: the users 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),  the  name  and
       arguments of the current process.

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

       -h     Suppress the heading.

       -l     Produce a long form of output, which is the default.

       -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 commands.

              example% w
              7:36am  up 6 days, 16:45,  1 users,  load average: 0.20, 0.23, 0.18
              User tty  login@    idle JCPU PCPU what
              ralph     console   7:10am       1 10:05     4:31 w

       The  environment  variables  LC_CTYPE, LANG, and LC_default control the
       character classification throughout w.  On entry to w,  these  environ-
       ment  variables are checked in the following order: LC_CTYPE, LANG, and
       LC_default.  When a valid value is found, remaining  environment  vari-
       ables  for  character  classification  are ignored.  For example, a new
       setting for LANG does not override the current valid character  classi-
       fication  rules  of  LC_CTYPE.   When  none of the values is valid, the
       shell character classification defaults to the POSIX.1 "C" locale.


       ps(1), who(1), utmp(5V)

       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 back-
       ground  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  com-
       mand is printed in parentheses.

       w  does  not  know  about  the new conventions for detecting background
       jobs.  It will sometimes find a background job  instead  of  the  right

                               9 September 1987                           W(1)