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---
layout: page
category_title: Intermediate commands
category-page: intermediate
tags: who user list log
author: Marco Farace
title: Who/WhoamI
---
<p>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. </p>
<h3> Flags </h3>
<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. This is the
POSIX way of saying who am i.</li>
<li>-q: ``Quick mode'': List only the names and the number of users cur-
rently 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.</li>
<li>file: By default, who gathers information from the file /var/run/utmpx.
An alternative file may be specified.</li>
</ul>