| -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 |
NAME
who - show who is logged on
SYNOPSIS
who [OPTION]... [ FILE | ARG1 ARG2]
DESCRIPTION
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.
AUTHOR
Written by Joseph Arceneaux, David MacKenzie, and Michael Stone.
REPORTING BUGS
GNU coreutils online help: <https://www.gnu.org/software/coreutils/> Report any translation bugs to <https://translationproject.org/team/>
SEE ALSO
Full documentation <https://www.gnu.org/software/coreutils/who> or available locally via: info '(coreutils) who invocation'
Packaged by Debian (9.7-3) Copyright © 2025 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.