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---
layout: page
category-page: intermediate
category-title: Intermediate commands
author: Marco Farace
title: who
---
The <code>who</code> command displays a list of all logged in users/display info
about current user
The who utility displays a list of all users currently logged on, showing
for each user the login name, tty name, the date and time of login, and
hostname if not local.<br>
<h3>Flags</h3>
Here are just some of the most useful options for this command:
<ul>
<li>-b: Display time of last system boot.</li>
<li> -d: Print dead processes.</li>
<li>-H: Write column headings above the regular output.</li>
<li>-m: Only print information about the current terminal.</li>
<li>-q: <i>Quick mode</i>: List only the names and the number of users currently logged on.
When this option is used, all other options are
ignored.
</li>
<li>-s: List only the name, line and time fields. This is the default.</li>
<li>-T: Print a character after the user name indicating the state of the
terminal line: "+" if the terminal is writable; "-" if it is not;
and "?" if a bad line is encountered.
</li>
<li>-u: Print the idle time for each user, and the associated process ID.</li>
<li>am I: Returns the invoker's real user name. You can also use <code>whoami</code></li>
<li>file: By default, who gathers information from the file /var/run/utmpx.
An alternative file may be specified.
</li>
</ul>