Here you'll find some samples code from my first years of playing with Perl and Linux. There are some things you should know:

I refuse to use "clever" programming techniques that reduce the byte count at the cost of readability. If you need to reduce the size of your punch-card stack, you are welcome to use shortcuts but don't expect to see a lot of implicit variables and tricks in my code.
Some of these examples exhibit bad programming techniques, use them at your own risk. However I think you will find them all harmless.
I welcome help in improving the structure and performance of the code. Please E-mail me.
These are put in the public domain to help repay some of the people that have done the same for me. If you can use something here, great. Please let me know how they work out.

What you will find here:

Code

Cellmail -- Send a summary message to your cell phone when you get new E-mail.
sshblack -- Automatic BLACKLISTing to block SSH-weak-password hack attempts. Currently at Version 2.8.1
DAVBlack -- Automatic BLACKLISTing for various attacks against your webserver.
Bigfish -- Analyze your tarpit guests and prepare LART messages for heavy-hitters.
Cleaner -- Clean (obfuscate) your SPAM before you submit it to SpamCop or send a LART.
Log Cleaners -- Tiny code snippets used to parse web/mail/ftp logs to sift out all the insignificant stuff.
StockChecker -- A very simple application of Finance::Quote to make a CGI page and E-mail autoresponder to generate stock quotes for things like Blackberry handhelds and cell phones.
Airraid -- Simulate or fake multiple wireless access points with a single wireless card in your PC.

Configuration

Sendmail Dynamic -- Configuring the Sendmail program to work behind a dynamic address ISP
Sendmail Relay -- Configuring the Sendmail program to work as a relay on an internal network
Firewall Config -- Something probably everyone already knows. How to set up an iptables firewall in Linux
Spam Assassin Rules -- Some simple rules for Spam Assassin that are updated depending on the spam du jour
BackTrack Notes -- Running BackTrack from your USB flash drive and some notes on the BackTrack penetration testing distribution
Yet Another Movie Jukebox (YAMJ) -- Configuration notes and tips for getting YAMJ running with your Popcorn Hour Media Player
Yet Another Movie Jukebox (YAMJ) With Multiple Libraries -- Configuration notes and tips for running YAMJ with multiple libraries

GO! Choose from the menu at the right to go to the code.