who - show who is logged on

       Written by Joseph Arceneaux, David MacKenzie, and Michael Stone.

       Copyright  ©  2024  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.

       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.

       who - show who is logged on

       GNU coreutils online help: <https://www.gnu.org/software/coreutils/>
       Report any translation bugs to <https://translationproject.org/team/>

       Full documentation <https://www.gnu.org/software/coreutils/who>
       or available locally via: info '(coreutils) who invocation'

GNU coreutils 9.5                                  April 2025                                             WHO(1)

who [OPTION]... [ FILE|ARG1ARG2 ]