Now we'll telnet into Cash and concatenate sue.pub file into /home/named/.ssh/authorized_keys file.

Cash$> pwd /home/named/.ssh Cash$> cat sue.pub >> authorized_keys Cash$> exit Connection closed. Johnny$>

Let's recap what we've done so far. 1) We've created public and private keys on Johnny. 2) We've ftp'd public key file, sue.pub, from Johnny to Cash. 3) We've telnetted to Cash, and concatenated contents of sue.pub into authorized_keys

We're now ready to manually login from Johnny to Cash using ssh.

Johnny$> ssh -i /home/boy/.ssh/sue named@Cash The authenticity of host 'Cash (xxx.yyy.zzz.aaa)' can't be established. RSA key fingerprint is 65:11:7d:ef:ed:a3:cc:34:d1:b5:ba:c9:16:22:31:23. Are you sure you want to continue connecting (yes/no)? yes ================================================================

*** NOTICE TO ALL USERS ***

================================================================ Cash$>exit Connection to Cash closed. Johnny$>

Now on Johnny, create a shell script called 'boynamedsue.sh' with following one line of contents and chmod script to 777.

ssh -i /home/boy/.ssh/sue named@Cash /usr/bin/ls -l

Next, execute script on Johnny.

Johnny$> boynamedsue.sh ================================================================

*** NOTICE TO ALL USERS ***

================================================================ -rwxrwxr-x 1 named namedgrp 10020 Oct 17 14:35 namedfile1.txt -rw-r--r-- 1 named namedgrp 680 Aug 14 16:18 namedfile.html -rw------- 1 named namedgrp 1148 Aug 18 09:51 mbox drwxr-xr-x 2 named namedgrp 512 Jun 17 13:38 old Johnny$>

You just executed a program on Johnny, that logged into Cash and ran a program (unix 'ls -l').

The next step you'll want to take is to replace '/usr/bin/ls -l' command in boynamedsue.sh program with path and name of program that you want to run.

What should you do to prevent virus infection if you don't have anti virus software installed on your PC? We should all give a word of thanks for Internet. Rush over to one free virus scanning services which will scan your hard drive for malicious codes.

Trend Micro's Housecall scans your drive for viruses, trojans and worms.They ask you to register first but you can scan without registering.Why not go over to http://housecall.trendmicro.com where you can go Visit Symantec's Security Check site and download their scan for viruses software which check your PC for possible infections of any malicious codes.Go to http://security.norton.com/ssc/vc_scan.asp.

Don't do it.Don't say,yes,I will get anti virus protection soon.It will be when you wait one day too many and realize your computer must have a virus because it is deleting files,randomly showing graphics,performing one task when it should be performing another task, and other strange things.Take time or invest money for virus protection right now.