diff options
Diffstat (limited to 'misc/slackbook/html/basic-network-commands-telnet.html')
| -rw-r--r-- | misc/slackbook/html/basic-network-commands-telnet.html | 173 |
1 files changed, 173 insertions, 0 deletions
diff --git a/misc/slackbook/html/basic-network-commands-telnet.html b/misc/slackbook/html/basic-network-commands-telnet.html new file mode 100644 index 00000000..736a2648 --- /dev/null +++ b/misc/slackbook/html/basic-network-commands-telnet.html @@ -0,0 +1,173 @@ +<!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>telnet</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="Basic Network Commands" href="basic-network-commands.html" /> +<link rel="PREVIOUS" title="finger" href="basic-network-commands-finger.html" /> +<link rel="NEXT" title="The Secure shell" href="basic-network-commands-ssh.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="basic-network-commands-finger.html" +accesskey="P">Prev</a></td> +<td width="80%" align="center" valign="bottom">Chapter 13 Basic Network Commands</td> +<td width="10%" align="right" valign="bottom"><a href="basic-network-commands-ssh.html" +accesskey="N">Next</a></td> +</tr> +</table> + +<hr align="LEFT" width="100%" /> +</div> + +<div class="SECT1"> +<h1 class="SECT1"><a id="BASIC-NETWORK-COMMANDS-TELNET" +name="BASIC-NETWORK-COMMANDS-TELNET">13.5 <tt class="COMMAND">telnet</tt></a></h1> + +<p>Someone once stated that <tt class="COMMAND">telnet</tt>(1) was the coolest thing he +had ever seen on computers. The ability to remotely log in and do stuff on another +computer is what separates Unix and Unix-like operating systems from other operating +systems.</p> + +<p><tt class="COMMAND">telnet</tt> allows you to log in to a computer, just as if you +were sitting at the terminal. Once your username and password are verified, you are given +a shell prompt. From here, you can do anything requiring a text console. Compose email, +read newsgroups, move files around, and so on. If you are running X and you <tt +class="COMMAND">telnet</tt> to another machine, you can run X programs on the remote +computer and display them on yours.</p> + +<p>To login to a remote machine, use this syntax:</p> + +<table border="0" bgcolor="#E0E0E0" width="100%"> +<tr> +<td> +<pre class="SCREEN"> +<samp class="PROMPT">%</samp> <kbd class="USERINPUT">telnet <<var +class="REPLACEABLE">hostname</var>></kbd> +</pre> +</td> +</tr> +</table> + +<p>If the host responds, you will receive a login prompt. Give it your username and +password. That's it. You are now at a shell. To quit your telnet session, use either the +<tt class="COMMAND">exit</tt> command or the <tt class="COMMAND">logout</tt> command.</p> + +<div class="WARNING"> +<table class="WARNING" width="100%" border="0"> +<tr> +<td width="25" align="CENTER" valign="TOP"><img src="./imagelib/admon/warning.png" +hspace="5" alt="Warning" /></td> +<td align="LEFT" valign="TOP"> +<p><tt class="COMMAND">telnet</tt> does not encrypt the information it sends. Everything +is sent in plain text, even passwords. It is not advisable to use <tt +class="COMMAND">telnet</tt> over the Internet. Instead, consider the <tt +class="COMMAND">Secure Shell</tt>. It encrypts all traffic and is available for free.</p> +</td> +</tr> +</table> +</div> + +<div class="SECT2"> +<h2 class="SECT2"><a id="AEN4593" name="AEN4593">13.5.1 The other use of telnet</a></h2> + +<p>Now that we have convinced you not to use the telnet protocol anymore to log into a +remote machine, we'll show you a couple of useful ways to use <tt +class="COMMAND">telnet</tt>.</p> + +<p>You can also use the <tt class="COMMAND">telnet</tt> command to connect to a host on a +certain port.</p> + +<table border="0" bgcolor="#E0E0E0" width="100%"> +<tr> +<td> +<pre class="SCREEN"> +<samp class="PROMPT">%</samp> <kbd class="USERINPUT">telnet <<var +class="REPLACEABLE">hostname</var>> [port]</kbd> +</pre> +</td> +</tr> +</table> + +<p>This can be quite handy when you quickly need to test a certain service, and you need +full control over the commands, and you need to see what exactly is going on. You can +interactively test or use an SMTP server, a POP3 server, an HTTP server, etc. this +way.</p> + +<p>In the next figure you'll see how you can <tt class="COMMAND">telnet</tt> to a HTTP +server on port 80, and get some basic information from it.</p> + +<div class="FIGURE"><a id="FIG-BASIC-NETWORK-COMMANDS-TELNET-WEB" +name="FIG-BASIC-NETWORK-COMMANDS-TELNET-WEB"></a> +<p><b>Figure 13-1. Telnetting to a webserver</b></p> + +<table border="0" bgcolor="#E0E0E0" width="100%"> +<tr> +<td> +<pre class="SCREEN"> +<samp class="PROMPT">%</samp> <kbd class="USERINPUT">telnet store.slackware.com 80</kbd> +Trying 69.50.233.153... +Connected to store.slackware.com. +Escape character is '^]'. +HEAD / HTTP/1.0 + +HTTP/1.1 200 OK +Date: Mon, 25 Apr 2005 20:47:01 GMT +Server: Apache/1.3.33 (Unix) mod_ssl/2.8.22 OpenSSL/0.9.7d +Last-Modified: Fri, 18 Apr 2003 10:58:54 GMT +ETag: "193424-c0-3e9fda6e" +Accept-Ranges: bytes +Content-Length: 192 +Connection: close +Content-Type: text/html + +Connection closed by foreign host. +<samp class="PROMPT">%</samp> +</pre> +</td> +</tr> +</table> +</div> + +<p>You can do the same for other plain-text protocols, as long as you know what port to +connect to, and what the commands are.</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="basic-network-commands-finger.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="basic-network-commands-ssh.html" +accesskey="N">Next</a></td> +</tr> + +<tr> +<td width="33%" align="left" valign="top"><tt class="COMMAND">finger</tt></td> +<td width="34%" align="center" valign="top"><a href="basic-network-commands.html" +accesskey="U">Up</a></td> +<td width="33%" align="right" valign="top">The Secure shell</td> +</tr> +</table> +</div> +</body> +</html> + |