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.
same as -b -d –login -p -r -t -T -u
time of last system boot
print dead processes
print line of column headings
–ips print ips instead of hostnames. with –lookup, canonicalizes
based on stored IP, if available, rather than stored hostname
print system login processes
attempt to canonicalize hostnames via DNS
-m only hostname and user associated with stdin
print active processes spawned by init
all login names and number of users logged on
print current runlevel
print only name, line, and time (default)
print last system clock change
-T, -w, –mesg
add user’s message status as +, – or ?
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)