I already mentioned adding Unix-like help to Amiga DOS commands. Once again it's here:
http://aminet.net/util/cli/Help.lha

Another very useful thing (especially if you are used to Unix or OS X) is Unix Commands for Amiga. They work great on Morhpos without any problem and the installation is trivial:
http://jffabre.free.fr/amiga/unixcmds.html
grep, sed, tail, wc... total of 23 commands

Actually, if you want to use the nix stuff it's best if you just install the developer sdk.

Hm, ok, haven't got there yet, so the developer kit has some Unix tools? Interesting... Will check them out I guess one day...