WHO(1) User Commands WHO(1)


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


print ips instead of hostnames. with –lookup, canonicalizes based on stored IP, if available, rather than stored hostname

-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


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.


GNU coreutils online help: http://www.gnu.org/software/coreutils/
Report who translation bugs to http://translationproject.org/team/


Copyright © 2017 Free Software Foundation, Inc. License GPLv3+:
GNU GPL version 3 or later http://gnu.org/licenses/gpl.html;.
This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law.


Full documentation at: http://www.gnu.org/software/coreutils/who; or available locally via: info ‘(coreutils) who invocation’