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


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: <>

Report any translation bugs to <>


Full documentation <>

or available locally via: info '(coreutils) who invocation'


Copyright © 2022 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.