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| author |   Patrick J Volkerding <volkerdi@slackware.com> | 2009-08-26 10:00:38 -0500 |
|---|---|---|
| committer |   Eric Hameleers <alien@slackware.com> | 2018-05-31 22:41:17 +0200 |
| commit | 5a12e7c134274dba706667107d10d231517d3e05 (patch) | |
| tree | 55718d5acb710fde798d9f38d0bbaf594ed4b296 /slackbook/html/shell-vt.html | |
| download | current-5a12e7c134274dba706667107d10d231517d3e05.tar.gz current-5a12e7c134274dba706667107d10d231517d3e05.tar.xz | |
Slackware 13.0slackware-13.0
Wed Aug 26 10:00:38 CDT 2009
Slackware 13.0 x86_64 is released as stable! Thanks to everyone who
helped make this release possible -- see the RELEASE_NOTES for the
credits. The ISOs are off to the replicator. This time it will be a
6 CD-ROM 32-bit set and a dual-sided 32-bit/64-bit x86/x86_64 DVD.
We're taking pre-orders now at store.slackware.com. Please consider
picking up a copy to help support the project. Once again, thanks to
the entire Slackware community for all the help testing and fixing
things and offering suggestions during this development cycle.
As always, have fun and enjoy! -P.
Diffstat (limited to 'slackbook/html/shell-vt.html')
| -rw-r--r-- | slackbook/html/shell-vt.html | 137 |
1 files changed, 137 insertions, 0 deletions
diff --git a/slackbook/html/shell-vt.html b/slackbook/html/shell-vt.html new file mode 100644 index 000000000..2d28160c5 --- /dev/null +++ b/slackbook/html/shell-vt.html @@ -0,0 +1,137 @@ +<!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>Virtual Terminals</title> +<meta name="GENERATOR" content="Modular DocBook HTML Stylesheet Version 1.7" /> +<link rel="HOME" title="Slackware Linux Essentials" href="index.html" /> +<link rel="UP" title="The Shell" href="shell.html" /> +<link rel="PREVIOUS" title="The Bourne Again Shell (bash)" href="shell-bash.html" /> +<link rel="NEXT" title="Filesystem Structure" href="filesystem-structure.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="SECT1" 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="shell-bash.html" +accesskey="P">Prev</a></td> +<td width="80%" align="center" valign="bottom">Chapter 8 The Shell</td> +<td width="10%" align="right" valign="bottom"><a href="filesystem-structure.html" +accesskey="N">Next</a></td> +</tr> +</table> + +<hr align="LEFT" width="100%" /> +</div> + +<div class="SECT1"> +<h1 class="SECT1"><a id="SHELL-VT" name="SHELL-VT">8.4 Virtual Terminals</a></h1> + +<p>So you're in the middle of working on something and you decide you need to do +something else. You could just drop what you're doing and switch tasks, but this is a +multi-user system, right? And you can log in as many times simultaneously as you want, +right? So why should you have to do one thing at a time?</p> + +<p>You don't. We can't all have multiple keyboards, mice, and monitors for one machine; +chances are most of us don't want them. Clearly, hardware isn't the solution. That leaves +software, and Linux steps up on this one, providing “virtual terminals”, or +“VTs”.</p> + +<p>By pressing <kbd class="USERINPUT">Alt</kbd> and a function key, you can switch +between virtual terminals; each function key corresponds to one. Slackware has logins on +6 VTs by default. <b class="KEYCAP">Alt</b>+<b class="KEYCAP">F2</b> will take you to the +second one, <b class="KEYCAP">Alt</b>+<b class="KEYCAP">F3</b> to the third, etc.</p> + +<p>The rest of the function keys are reserved for X sessions. Each X session uses its own +VT, beginning with the seventh (<b class="KEYCAP">Alt</b>+<b class="KEYCAP">F7</b>) and +going up. When in X, the <b class="KEYCAP">Alt</b>+<b class="KEYCAP">Function key</b> +combination is replaced with <b class="KEYCAP">Ctrl</b>+<b class="KEYCAP">Alt</b>+<b +class="KEYCAP">Function</b>; so if you are in X and want to get back to a text login +(without exiting your X session), <b class="KEYCAP">Ctrl</b>+<b class="KEYCAP">Alt</b>+<b +class="KEYCAP">F3</b> will take you to the third. (<b class="KEYCAP">Alt</b>+<b +class="KEYCAP">F7</b> will take you back, assuming you're using the first X session.)</p> + +<div class="SECT2"> +<h2 class="SECT2"><a id="AEN3024" name="AEN3024">8.4.1 Screen</a></h2> + +<p>But what about situations where there are no virtual terminals? What then? +Fortunately, slackware includes a beautiful screen manager aptly named <tt +class="COMMAND">screen</tt>. <tt class="COMMAND">screen</tt> is a terminal emulator that +has virtual terminal like capabilities. Executing <tt class="COMMAND">screen</tt> flashes +a brief introduction, then dumps to a terminal. Unlike the standard virtual terminals, +<tt class="COMMAND">screen</tt> has its own commands. All <tt class="COMMAND">screen</tt> +commands are prefixed with a <b class="KEYCAP">Crtl</b>+<b class="KEYCAP">A</b> +keystroke. For example, <b class="KEYCAP">Ctrl</b>+<b class="KEYCAP">A</b>+<b +class="KEYCAP">C</b> will create a new terminal session. <b class="KEYCAP">Ctrl</b>+<b +class="KEYCAP">A</b>+<b class="KEYCAP">N</b> will switch to the next terminal. <b +class="KEYCAP">Ctrl</b>+<b class="KEYCAP">A</b>+<b class="KEYCAP">P</b> switches to the +previous terminal.</p> + +<p><tt class="COMMAND">screen</tt> also supports detaching and re-attaching to <tt +class="COMMAND">screen</tt> sessions which is particularly useful for remote sessions via +<tt class="COMMAND">ssh</tt> and <tt class="COMMAND">telnet</tt>, (more on those later). +<b class="KEYCAP">Ctrl</b>+<b class="KEYCAP">A</b>+<b class="KEYCAP">D</b> will detach +from the currently running screen. Executing <tt class="COMMAND">screen -r</tt> will list +all currently running screen sessions you may reattach to.</p> + +<table border="0" bgcolor="#E0E0E0" width="100%"> +<tr> +<td> +<pre class="SCREEN"> +<samp class="PROMPT">%</samp> <kbd class="USERINPUT">screen -r</kbd> +There are several suitable screens on: + 1212.pts-1.redtail (Detached) + 1195.pts-1.redtail (Detached) + 1225.pts-1.redtail (Detached) + 17146.pts-1.sanctuary (Dead ???) +Remove dead screens with 'screen -wipe'. +Type "screen [-d] -r [pid.]tty.host" to resume one of them. +</pre> +</td> +</tr> +</table> + +<p>Running <tt class="COMMAND">screen -r 1212</tt> would reattach to the first screen +listed. I mentioned earlier how useful this was for remote sessions. If I were to login +to a remote slackware server via <tt class="COMMAND">ssh</tt>, and my connection was +severed by some chance occurrence such as a local power failure, whatever I was doing at +that moment would instantly perish, which can be a horrible thing for your server. Using +<tt class="COMMAND">screen</tt> prevents this by detaching my session if my connection is +dropped. Once my connection is restored, I can reattach to my screen session and resume +right where I left off.</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="shell-bash.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="filesystem-structure.html" +accesskey="N">Next</a></td> +</tr> + +<tr> +<td width="33%" align="left" valign="top">The Bourne Again Shell (bash)</td> +<td width="34%" align="center" valign="top"><a href="shell.html" +accesskey="U">Up</a></td> +<td width="33%" align="right" valign="top">Filesystem Structure</td> +</tr> +</table> +</div> +</body> +</html> + |