who - show who is logged on


who [OPTION]... [ FILE | ARG1 ARG2 ]


Print information about users who are currently logged in.
-a, --all same as -b -d --login -p -r -t -T -u
-b, --boot time of last system boot
-d, --dead print dead processes
-H, --heading
 print line of column headings
-l, --login
 print system login processes
 attempt to canonicalize hostnames via DNS
-m only hostname and user associated with stdin
-p, --process
 print active processes spawned by init
-q, --count
 all login names and number of users logged on
-r, --runlevel
 print current runlevel
-s, --short
 print only name, line, and time (default)
-t, --time print last system clock change
-T, -w, --mesg
 add user’s message status as +, - or ?
-u, --users
 list users logged in
 same as -T
 same as -T
--help display this help and exit
 output version information and exit
If FILE is not specified, use /var/run/utmp. /var/log/wtmp as FILE is common. If ARG1 ARG2 given, -m presumed: ‘am i’ or ‘mom likes’ are usual.


Written by Joseph Arceneaux, David MacKenzie, and Michael Stone.


Report who bugs to GNU coreutils home page: <> General help using GNU software: <>


Copyright © 2009 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <>. This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law.


The full documentation for who is maintained as a Texinfo manual. If the info and who programs are properly installed at your site, the command
info coreutils 'who invocation'
should give you access to the complete manual.

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