W(1)                                                          Linux User's Manual                                                         W(1)

NAME

       w - Show who is logged on and what they are doing.

SYNOPSIS

       w [-husfVo] [user]

DESCRIPTION

       w  displays  information  about the users currently on the machine, and their processes.  The header shows, in this order,  the current
       time, how long the system has been running, how many users are currently logged on, and the system load averages for the past 1, 5, and
       15 minutes.

       The  following  entries  are displayed for each user: login name, the tty name, the remote host, login time, idle time, JCPU, PCPU, and
       the command line of their current process.

       The JCPU time is the time used by all processes attached to the tty.  It does not  include  past  background  jobs,  but  does  include
       currently running background jobs.

       The PCPU time is the time used by the current process, named in the "what" field.

COMMAND-LINE OPTIONS

       -h   Don't print the header.

       -u   Ignores  the  username while figuring out the current process and cpu times.  To demonstrate this, do a "su" and do a "w" and a "w
            -u".

       -s   Use the short format.  Don't print the login time, JCPU or PCPU times.

       -f   Toggle printing the from (remote hostname) field.  The default as released is for the from field to not be printed, although  your
            system administrator or distribution maintainer may have compiled a version in which the from field is shown by default.

       -V   Display version information.

       -o   Old style output. Prints blank space for idle times less than one minute.

       user Show information about the specified user only.

ENVIRONMENT

       PROCPS_USERLEN
              Override the default width of the username column. Defaults to 8.

       PROCPS_FROMLEN
              Override the default width of the from column. Defaults to 16.

FILES

       /var/run/utmp
              information about who is currently logged on

       /proc  process information

NOTES

       The  output  for  Idle,  JCPU  and  PCPU  times  vaires  depending on if you use the -o (old style) option or not. These formats can be
       confusing if you switch between the old style and standard.  In the following paragraphs days are DD, hours HH, minutes MM, seconds  SS
       and 100ths of seconds CC.

       The standard format is DDdays, HH:MMm, MM:SS or SS.CC if the times are greater than 2 days, 1hour, or 1 minute respectively.

       For  the  -o option, the output will be either  DDdays, HH:MM, MM:SSm or blank if the times are greater than 2 days, 1 hour or 1 minute
       respectively.

SEE ALSO

       free(1), ps(1), top(1), uptime(1), utmp(5), who(1)

AUTHORS

       w was re-written almost entirely by Charles Blake, based on the version by Larry Greenfield <greenfie@gauss.rutgers.edu> and Michael K.
       Johnson <johnsonm@redhat.com>.

       Please send bug reports to <albert@users.sf.net>

                                                                5 October 2009                                                            W(1)
 

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