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
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
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
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.
Copyright © 2017 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.
Full documentation at: http://www.gnu.org/software/coreutils/who; or available locally via: info ‘(coreutils) who invocation’