Man1 - who.1

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

–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: https://www.gnu.org/software/coreutils/
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Copyright © 2021 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later https://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 https://www.gnu.org/software/coreutils/who
or available locally via: info ’(coreutils) who invocation’