Default tunnel and excavate programs

I am new to LUA and computercraft and want to find the script for these programs so I can look at them on paper and figure how the commands fit together. I tried to look for them on the internet but was unable to find them. All I can find is edited programs.

Split into new topic.

They are in your rom/programs folder in CC, and you can extract this folder from the ComputerCraft archive, where it is under lua/rom/programs.