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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 | <html><head><title>Users and Groups</title><link rel="stylesheet" type="text/css" href="help:/common/kde-default.css"><link rel="stylesheet" type="text/css" href="help:/common/kde-docs.css"><link rel="stylesheet" type="text/css" href="help:/common/kde-localised.css"><link rel="stylesheet" type="text/css" href="help:/common/kubuntu.css"><meta name="generator" content="DocBook XSL Stylesheets V1.76.1"><link rel="home" href="index.html" title="The Basics of Kubuntu"><link rel="up" href="index.html" title="The Basics of Kubuntu"><link rel="prev" href="filesystem.html" title="File System"><link rel="next" href="permissions.html" title="Permissions"><link rel="copyright" href="legal.html" title="Credits and License"><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><meta name="GENERATOR" content="KDE XSL Stylesheet V1.14 using libxslt"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div id="content"><div id="header"><div id="header_content"><div id="header_left"><div id="header_right"><img src="help:/common/top-kde.jpg" width="36" height="34"> Users and Groups</div></div></div></div><div class="navCenter"><table class="navigation"><tr><td class="prevCell"><a accesskey="p" href="filesystem.html">Prev</a></td><td class="upCell"> </td><td class="nextCell"><a accesskey="n" href="permissions.html">Next</a></td></tr></table></div><div id="contentBody"><div class="sect1"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="users-and-groups"></a>Users and Groups</h2></div></div></div><p>
Since Linux is a true multi-user system, the principles of both
<span class="emphasis"><em>users</em></span> and <span class="emphasis"><em>groups</em></span> are important to the
internal operation of the system, and also to the day-to-day use of the system.
The way Linux handles users and groups makes it one of the most secure
operating systems.
</p><div class="sect2"><div class="titlepage"><div><div><h3 class="title"><a name="users"></a>Users</h3></div></div></div><p>
There are two different types of users:
</p><div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem"><p>
<span class="strong"><strong>Physical Users</strong></span> are people who use the system
physically. They have user IDs which are usually unique, as well as group IDs.
</p></li><li class="listitem"><p>
<span class="strong"><strong>Logical Users</strong></span> are not tied to a person, but
instead are tied to a system function that are used by applications to perform
specific tasks. Daemons, mail, and news are examples of logical users.
</p></li></ul></div></div><div class="sect2"><div class="titlepage"><div><div><h3 class="title"><a name="groups"></a>Groups</h3></div></div></div><p>
Groups are logical expressions of organization. They tie users together and
provide group-based, rather than user-based, permissions. Common groups
include <span class="emphasis"><em>admin</em></span>,
<span class="emphasis"><em>audio</em></span>, and <span class="emphasis"><em>mail</em></span>.
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