> Linux Man Page: "who"


Search with Google


The Linux Documentation Project maintains an archive of snaphots of the (English language) core Linux manual pages that are maintained by Michael Kerrisk. Corrections and additions are welcome, but review the "Help Wanted" list, first.

Man pages belonging to programs are usually distributed together with those programs. Therefore, the core Linux man-pages mainly contains the pages for system calls and library routines, special devices, and file formats. However, it also contains documentation for a few programs, in cases where the authors or maintainers of the program do not distribute man pages themselves.

This page is part of release 3.11 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at


man page(1) manual page Table of Contents


who - show who is logged on


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


-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

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.

Reporting Bugs

Report bugs to <>.


Copyright © 2007 Free Software Foundation, Inc. This is free software. You may redistribute copies of it under the terms of the GNU General Public License <>. There is NO WARRANTY, to the extent permitted by law.

See Also

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 who

should give you access to the complete manual.

Table of Contents

use open software!