WHO(1) General Commands Manual WHO(1)

# [NAME](#NAME)

who - Print information about users who are currently logged in.

# [SYNOPSIS](#SYNOPSIS)

**who** \[OPTION]... \[ FILE | ARG1 ARG2 ]

# [DESCRIPTION](#DESCRIPTION)

Print information about users who are currently logged in.

# [OPTIONS](#OPTIONS)

[**-a**, **--all**](#a)

same as -b -d --login -p -r -t -T -u

[**-b**, **--boot**](#b)

time of last system boot

[**-d**, **--dead**](#d)

print dead processes

[**-H**, **--heading**](#H)

print line of column headings

[**-l**, **--login**](#l)

print system login processes

[**--lookup**](#lookup)

attempt to canonicalize hostnames via DNS

[**-m**](#m)

only hostname and user associated with stdin

[**-p**, **--process**](#p)

print active processes spawned by init

[**-q**, **--count**](#q)

all login names and number of users logged on

[**-r**, **--runlevel**](#r)

print current runlevel

[**-s**, **--short**](#s)

print only name, line, and time (default)

[**-t**, **--time**](#t)

print last system clock change

[**-u**, **--users**](#u)

list users logged in

[**-T**, **--mesg**](#T)

add user's message status as +, - or ?

[**-h**, **--help**](#h)

Print help

[**-V**, **--version**](#V)

Print version

\[*FILE*]

# [VERSION](#VERSION)

v(uutils coreutils) 0.12.0

2026-10-29

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Document: who(1) from uutils 0.12.0-r5 (Chainguard OS)
Source: https://github.com/uutils/coreutils