I'm trying to download this Mod for Minecraft from this link http://www.minecraftforum.net/topic/94310-125-single-player-commands-v322-official-download/
I have no idea how to install the mod. I've seen videos on Youtube but most of their comments state that there wrong. I have Ubuntu.
Best Answer
Similarly to Risugami's Mac OS X scripts for applying modifications, I have made these two scripts that will 1) open the minecraft.jar, which allows you to drag and drop the *.class files into the mctmp folder. And 2) close and apply whatever changes were made to the mctmp folder, to the minecraft.jar
Here: openjar.sh
closejar.sh