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+<head>
+<meta name="generator" content="HTML Tidy, see www.w3.org" />
+<title>Process Control</title>
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+<link rel="HOME" title="Slackware Linux Essentials" href="index.html" />
+<link rel="PREVIOUS" title="Aliasing files with ln" href="file-commands-link.html" />
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+alink="#0000FF">
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+<table summary="Header navigation table" width="100%" border="0" cellpadding="0"
+cellspacing="0">
+<tr>
+<th colspan="3" align="center">Slackware Linux Essentials</th>
+</tr>
+
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+accesskey="P">Prev</a></td>
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+</table>
+
+<hr align="LEFT" width="100%" />
+</div>
+
+<div class="CHAPTER">
+<h1><a id="PROCESS-CONTROL" name="PROCESS-CONTROL"></a>Chapter 11 Process Control</h1>
+
+<div class="TOC">
+<dl>
+<dt><b>Table of Contents</b></dt>
+
+<dt>11.1 <a
+href="process-control.html#PROCESS-CONTROL-BACKGROUNDING">Backgrounding</a></dt>
+
+<dt>11.2 <a href="process-control-foregrounding.html">Foregrounding</a></dt>
+
+<dt>11.3 <a href="process-control-ps.html"><tt class="COMMAND">ps</tt></a></dt>
+
+<dt>11.4 <a href="process-control-kill.html"><tt class="COMMAND">kill</tt></a></dt>
+
+<dt>11.5 <a href="process-control-top.html"><tt class="COMMAND">top</tt></a></dt>
+</dl>
+</div>
+
+<p>Every program that is running is called a process. These processes range from things
+like the X Window System to system programs (daemons) that are started when the computer
+boots. Every process runs as a particular user. Processes that are started at boot time
+usually run as <tt class="USERNAME">root</tt> or <tt class="USERNAME">nobody</tt>.
+Processes that you start will run as you. Processes started as other users will run as
+those users.</p>
+
+<p>You have control over all the processes that you start. Additionally, <tt
+class="USERNAME">root</tt> has control over all processes on the system, including those
+started by other users. Processes can be controlled and monitored through several
+programs, as well as some shell commands.</p>
+
+<div class="SECT1">
+<h1 class="SECT1"><a id="PROCESS-CONTROL-BACKGROUNDING"
+name="PROCESS-CONTROL-BACKGROUNDING">11.1 Backgrounding</a></h1>
+
+<p>Programs started from the command line start up in the foreground. This allows you to
+see all the output of the program and interact with it. However, there are several
+occasions when you'd like the program to run without taking up your terminal. This is
+called running the program in the background, and there are a few ways to do it.</p>
+
+<p>The first way to background a process is by adding an ampersand to the command line
+when you start the program. For example, assume you wanted to use the command line mp3
+player <tt class="COMMAND">amp</tt> to play a directory full of mp3s, but you needed to
+do something else on the same terminal. The following command line would start up amp in
+the background:</p>
+
+<table border="0" bgcolor="#E0E0E0" width="100%">
+<tr>
+<td>
+<pre class="SCREEN">
+<samp class="PROMPT">%</samp> <kbd class="USERINPUT">amp *.mp3 &#38;</kbd>
+</pre>
+</td>
+</tr>
+</table>
+
+<p>The program will run as normal, and you are returned to a prompt.</p>
+
+<p>The other way to background a process is to do so while it is running. First, start up
+a program. While it is running, hit <b class="KEYCAP">Control</b>+<b
+class="KEYCAP">z</b>. This suspends the process. A suspended process is basically paused.
+It momentarily stops running, but can be started up again at any time. Once you have
+suspended a process, you are returned to a prompt. You can background the process by
+typing:</p>
+
+<table border="0" bgcolor="#E0E0E0" width="100%">
+<tr>
+<td>
+<pre class="SCREEN">
+<samp class="PROMPT">%</samp> <kbd class="USERINPUT">bg</kbd>
+</pre>
+</td>
+</tr>
+</table>
+
+<p>Now the suspended process is running in the background.</p>
+</div>
+</div>
+
+<div class="NAVFOOTER">
+<hr align="LEFT" width="100%" />
+<table summary="Footer navigation table" width="100%" border="0" cellpadding="0"
+cellspacing="0">
+<tr>
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+accesskey="P">Prev</a></td>
+<td width="34%" align="center" valign="top"><a href="index.html"
+accesskey="H">Home</a></td>
+<td width="33%" align="right" valign="top"><a href="process-control-foregrounding.html"
+accesskey="N">Next</a></td>
+</tr>
+
+<tr>
+<td width="33%" align="left" valign="top">Aliasing files with <tt
+class="COMMAND">ln</tt></td>
+<td width="34%" align="center" valign="top">&nbsp;</td>
+<td width="33%" align="right" valign="top">Foregrounding</td>
+</tr>
+</table>
+</div>
+</body>
+</html>
+