I had a lot of fun at this weeks meeting! I gave a presentation on how to start patching binaries using the HT editor. I also gave a brief introduction to the structure of a linux executable.
Hte hex editor that comes in the handy command line format. All you have to do is run hte [program name] and your popped in an ncurses environment where you can examine the executable in different modes.
Check out RED MOD 0 for the written tutorial!