First pull request

[markc]

Thanks to ka7 for fixing a couple of typos. Appreciated. After quite a few years, this is the first PR, so it seems a few folks are at least kicking the tyres of this system. FWIW that makes me a bit nervous because up until now it's been basically my own personal dumping ground for aliases and scripts that I both need and also play around with. I've had almost zero feedback about how this SH system works for other people and how it could be improved and generalised outside my own system setup.

So let's enable the Discussions section and see if anyone else is game enough to suggest... anything :-)