diff options
Diffstat (limited to 'slackbook/html/process-control.html')
| -rw-r--r-- | slackbook/html/process-control.html | 138 |
1 files changed, 138 insertions, 0 deletions
diff --git a/slackbook/html/process-control.html b/slackbook/html/process-control.html new file mode 100644 index 00000000..8727262d --- /dev/null +++ b/slackbook/html/process-control.html @@ -0,0 +1,138 @@ +<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" + "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> +<html xmlns="http://www.w3.org/1999/xhtml"> +<head> +<meta name="generator" content="HTML Tidy, see www.w3.org" /> +<title>Process Control</title> +<meta name="GENERATOR" content="Modular DocBook HTML Stylesheet Version 1.7" /> +<link rel="HOME" title="Slackware Linux Essentials" href="index.html" /> +<link rel="PREVIOUS" title="Aliasing files with ln" href="file-commands-link.html" /> +<link rel="NEXT" title="Foregrounding" href="process-control-foregrounding.html" /> +<link rel="STYLESHEET" type="text/css" href="docbook.css" /> +<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" /> +</head> +<body class="CHAPTER" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#840084" +alink="#0000FF"> +<div class="NAVHEADER"> +<table summary="Header navigation table" width="100%" border="0" cellpadding="0" +cellspacing="0"> +<tr> +<th colspan="3" align="center">Slackware Linux Essentials</th> +</tr> + +<tr> +<td width="10%" align="left" valign="bottom"><a href="file-commands-link.html" +accesskey="P">Prev</a></td> +<td width="80%" align="center" valign="bottom"></td> +<td width="10%" align="right" valign="bottom"><a +href="process-control-foregrounding.html" accesskey="N">Next</a></td> +</tr> +</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 &</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> +<td width="33%" align="left" valign="top"><a href="file-commands-link.html" +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"> </td> +<td width="33%" align="right" valign="top">Foregrounding</td> +</tr> +</table> +</div> +</body> +</html> + |