who: Show who is logged on

SYNOPSIS

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
--lookup: 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
--message: same as -T
--writable: same as -T
--help: display this help and exit
--version: 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/>

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'