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<H4 ALIGN="LEFT"><A NAME="Heading18"></A><FONT COLOR="#000077">Other Networking Commands</FONT></H4>
<P>In addition to <B>ftp</B>, which is used to transfer—copy—files from system to system, there are a number of other common networking commands. These commands work to help the connection among your computer and others on the same link. Generally, if you work at a site with multiple UNIX computers, these computers will be networked together, usually using the Ethernet network protocol. Your systems may also be networked with the worldwide Internet, which as you already know is a collection of connected networks. (Say that three times fast.)</P>
<P><FONT SIZE="+1"><B>Using the Rlogin Command</B></FONT></P>
<P>The <B>rlogin</B> command allows you to remotely login to another computer on your network (remember that if you’re on the Internet, you’re on a worldwide network). You must, of course, have a valid user account on any machine to which you want to login. To use <B>rlogin</B>, you need the name of the machine to login to. To login a machine named <I>nicollet</I>, you’d use a command line like the following:</P>
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gilbert:/$ rlogin nicollet
Password:
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<P>At the <I>Password</I> prompt, you may need to enter your password on machine <I>nicollet</I>, which may or may not be different from the password you use on your local machine. Once logged in, you’re computing on the remote machine and can run any standard UNIX command. You also logout the same way you normally logout:</P>
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gilbert:/$ logout
Connection closed.
$
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<P>Note that after you logout from a remote machine, you’re back to the command prompt at your local machine. This tends to get confusing, so be careful.
</P>
<P>The basic form of <B>rlogin</B> is:</P>
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rlogin hostname
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<P>where <I>hostname</I> is the name of the machine to login.</P>
<P><FONT SIZE="+1"><B>Using the Telnet Command</B></FONT></P>
<P>The <B>telnet</B> command works much the same as <B>rlogin</B> does, allowing you to connect directly to a remote machine. Because the <B>telnet</B> command is considered part of the toolkit used by the Internet surfer, it’s actually gained in popularity over the years.</P>
<P>Telnet allows you either to run a command directly on a remote machine while displaying the results on your own or to run a specific command on a remote machine (many sites that allow Telnet put restrictions on what users can run, due to security concerns). With telnet, you only need to know the address of the machine you’re connecting to, such as <I>sunsite.unc.edu</I>, as illustrated by the following:</P>
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<PRE>
gilbert:/$ telnet
telnet> open sunsite.unc.edu
Trying 198.86.40.81
Connected
*************** Welcome to SunSITE.unc.edu ***************
SunSITE offers several public services via login. These include:
NO MORE PUBLIC gopher login!
Use lynx the simple WWW client to access gopher and Web areas
For a simple WAIS client (over 500 databases), login as swais
For WAIS search of political databases, login as politics
For WAIS search of LINUX databases, login as linux
For a FTP session, ftp to sunsite.unc.edu. Then login as anonymous
For more information about SunSITE, send mail to info@sunsite.unc.edu
UNIX (R) System V Release 4.0 (calypso-2.oit.unc.edu)
login: swais
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<P>In this case, <I>sunsite.unc.edu</I> offers a variety of services to the general computing public, here centering around WAIS databases. Other Telnet sites may not offer such a wide variety of services; a site like <I>archie.rutgers.edu</I> offers only <B>archie</B> searches.</P>
<P>Unfortunately, Linux does not offer <B>archie</B> yet, so you’ll need to use a public <B>archie</B> server to perform a search.</P>
<P><I>Sunsite.unc.edu</I> is a public Internet site. If you’re using telnet within your corporation, the rules will be slightly different. Here, <I>sunsite.unc.edu</I> offers public access; you don’t need an account on <I>sunsite.unc.edu</I>, nor do you need a password. However, <I>sunsite.unc.edu</I> does put restrictions on what can be done by a visitor; for example, you can’t use the standard Linux command set and your options are limited to the login selections. For a private system, you’ll need an account on the remote system before you can login, and you may be subject to the same sorts of restrictions.</P><P><BR></P>
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