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Mon Apr 25 13:37:00 UTC 2011 Slackware 13.37 x86_64 stable is released! Thanks to everyone who pitched in on this release: the Slackware team, the folks producing upstream code, and linuxquestions.org for providing a great forum for collaboration and testing. The ISOs are off to be replicated, a 6 CD-ROM 32-bit set and a dual-sided 32-bit/64-bit x86/x86_64 DVD. Please consider supporting the Slackware project by picking up a copy from store.slackware.com. We're taking pre-orders now, and offer a discount if you sign up for a subscription. As always, thanks to the Slackware community for testing, suggestions, and feedback. :-) Have fun!
173 lines
6.2 KiB
HTML
173 lines
6.2 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
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"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head>
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<meta name="generator" content="HTML Tidy, see www.w3.org" />
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<title>telnet</title>
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<meta name="GENERATOR" content="Modular DocBook HTML Stylesheet Version 1.7" />
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<link rel="HOME" title="Slackware Linux Essentials" href="index.html" />
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<link rel="UP" title="Basic Network Commands" href="basic-network-commands.html" />
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<link rel="PREVIOUS" title="finger" href="basic-network-commands-finger.html" />
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<link rel="NEXT" title="The Secure shell" href="basic-network-commands-ssh.html" />
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<link rel="STYLESHEET" type="text/css" href="docbook.css" />
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<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
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</head>
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<body class="SECT1" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#840084"
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alink="#0000FF">
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<div class="NAVHEADER">
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<table summary="Header navigation table" width="100%" border="0" cellpadding="0"
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cellspacing="0">
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<tr>
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<th colspan="3" align="center">Slackware Linux Essentials</th>
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</tr>
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<tr>
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<td width="10%" align="left" valign="bottom"><a href="basic-network-commands-finger.html"
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accesskey="P">Prev</a></td>
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<td width="80%" align="center" valign="bottom">Chapter 13 Basic Network Commands</td>
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<td width="10%" align="right" valign="bottom"><a href="basic-network-commands-ssh.html"
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accesskey="N">Next</a></td>
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</tr>
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</table>
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<hr align="LEFT" width="100%" />
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</div>
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<div class="SECT1">
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<h1 class="SECT1"><a id="BASIC-NETWORK-COMMANDS-TELNET"
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name="BASIC-NETWORK-COMMANDS-TELNET">13.5 <tt class="COMMAND">telnet</tt></a></h1>
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<p>Someone once stated that <tt class="COMMAND">telnet</tt>(1) was the coolest thing he
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had ever seen on computers. The ability to remotely log in and do stuff on another
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computer is what separates Unix and Unix-like operating systems from other operating
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systems.</p>
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<p><tt class="COMMAND">telnet</tt> allows you to log in to a computer, just as if you
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were sitting at the terminal. Once your username and password are verified, you are given
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a shell prompt. From here, you can do anything requiring a text console. Compose email,
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read newsgroups, move files around, and so on. If you are running X and you <tt
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class="COMMAND">telnet</tt> to another machine, you can run X programs on the remote
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computer and display them on yours.</p>
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<p>To login to a remote machine, use this syntax:</p>
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<table border="0" bgcolor="#E0E0E0" width="100%">
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<tr>
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<td>
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<pre class="SCREEN">
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<samp class="PROMPT">%</samp> <kbd class="USERINPUT">telnet <<var
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class="REPLACEABLE">hostname</var>></kbd>
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</pre>
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</td>
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</tr>
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</table>
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<p>If the host responds, you will receive a login prompt. Give it your username and
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password. That's it. You are now at a shell. To quit your telnet session, use either the
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<tt class="COMMAND">exit</tt> command or the <tt class="COMMAND">logout</tt> command.</p>
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<div class="WARNING">
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<table class="WARNING" width="100%" border="0">
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<tr>
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<td width="25" align="CENTER" valign="TOP"><img src="./imagelib/admon/warning.png"
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hspace="5" alt="Warning" /></td>
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<td align="LEFT" valign="TOP">
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<p><tt class="COMMAND">telnet</tt> does not encrypt the information it sends. Everything
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is sent in plain text, even passwords. It is not advisable to use <tt
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class="COMMAND">telnet</tt> over the Internet. Instead, consider the <tt
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class="COMMAND">Secure Shell</tt>. It encrypts all traffic and is available for free.</p>
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</td>
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</tr>
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</table>
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</div>
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<div class="SECT2">
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<h2 class="SECT2"><a id="AEN4593" name="AEN4593">13.5.1 The other use of telnet</a></h2>
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<p>Now that we have convinced you not to use the telnet protocol anymore to log into a
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remote machine, we'll show you a couple of useful ways to use <tt
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class="COMMAND">telnet</tt>.</p>
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<p>You can also use the <tt class="COMMAND">telnet</tt> command to connect to a host on a
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certain port.</p>
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<table border="0" bgcolor="#E0E0E0" width="100%">
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<tr>
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<td>
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<pre class="SCREEN">
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<samp class="PROMPT">%</samp> <kbd class="USERINPUT">telnet <<var
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class="REPLACEABLE">hostname</var>> [port]</kbd>
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</pre>
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</td>
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</tr>
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</table>
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<p>This can be quite handy when you quickly need to test a certain service, and you need
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full control over the commands, and you need to see what exactly is going on. You can
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interactively test or use an SMTP server, a POP3 server, an HTTP server, etc. this
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way.</p>
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<p>In the next figure you'll see how you can <tt class="COMMAND">telnet</tt> to a HTTP
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server on port 80, and get some basic information from it.</p>
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<div class="FIGURE"><a id="FIG-BASIC-NETWORK-COMMANDS-TELNET-WEB"
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name="FIG-BASIC-NETWORK-COMMANDS-TELNET-WEB"></a>
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<p><b>Figure 13-1. Telnetting to a webserver</b></p>
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<table border="0" bgcolor="#E0E0E0" width="100%">
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<tr>
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<td>
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<pre class="SCREEN">
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<samp class="PROMPT">%</samp> <kbd class="USERINPUT">telnet store.slackware.com 80</kbd>
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Trying 69.50.233.153...
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Connected to store.slackware.com.
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Escape character is '^]'.
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HEAD / HTTP/1.0
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HTTP/1.1 200 OK
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Date: Mon, 25 Apr 2005 20:47:01 GMT
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Server: Apache/1.3.33 (Unix) mod_ssl/2.8.22 OpenSSL/0.9.7d
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Last-Modified: Fri, 18 Apr 2003 10:58:54 GMT
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ETag: "193424-c0-3e9fda6e"
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Accept-Ranges: bytes
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Content-Length: 192
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Connection: close
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Content-Type: text/html
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Connection closed by foreign host.
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<samp class="PROMPT">%</samp>
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</pre>
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</td>
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</tr>
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</table>
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</div>
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<p>You can do the same for other plain-text protocols, as long as you know what port to
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connect to, and what the commands are.</p>
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</div>
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</div>
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<div class="NAVFOOTER">
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<hr align="LEFT" width="100%" />
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<table summary="Footer navigation table" width="100%" border="0" cellpadding="0"
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cellspacing="0">
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<tr>
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<td width="33%" align="left" valign="top"><a href="basic-network-commands-finger.html"
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accesskey="P">Prev</a></td>
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<td width="34%" align="center" valign="top"><a href="index.html"
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accesskey="H">Home</a></td>
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<td width="33%" align="right" valign="top"><a href="basic-network-commands-ssh.html"
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accesskey="N">Next</a></td>
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</tr>
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<tr>
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<td width="33%" align="left" valign="top"><tt class="COMMAND">finger</tt></td>
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<td width="34%" align="center" valign="top"><a href="basic-network-commands.html"
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accesskey="U">Up</a></td>
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<td width="33%" align="right" valign="top">The Secure shell</td>
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</tr>
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</table>
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</div>
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</body>
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</html>
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