who Man page

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

–ips 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

-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


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


GNU coreutils online help:
Report who translation bugs to


Copyright © 2016 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.


Full documentation at:
or available locally via: info ‘(coreutils) who invocation’

GNU coreutils 8.25 February 2016 WHO(1)