Ahhh, good old bash. I echo @bex-dk — once upon a time, this was child's play for me. I was a CS grad, had a good programming job, swam in Linux as if it were my second home.

Got burned out. Ran away from it. Switched to Mac so that I didn't have to think about any of it anymore. Oh yeah, and moved to Japan and got into photography and poetry and had some kids and drank too much sake and all that.

You wrote this tutorial very well. Brings back some memories.