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
Written by Joseph Arceneaux, David MacKenzie, and Michael Stone.
Report who bugs to email@example.com
GNU coreutils home page: <http://www.gnu.org/software/coreutils/>
General help using GNU software: <http://www.gnu.org/gethelp/>
Report who translation bugs to <http://translationproject.org/team/>
Copyright (C) 2013 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.
The full documentation for who is maintained as a Texinfo manual. If
the info and who programs are properly installed at your site, the com-
info coreutils 'who invocation'
should give you access to the complete manual.
GNU coreutils 8.21 March 2016 WHO(1)
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