You should have a look on
www.aminet.net for some stuff that makes your amiga work a bit more like unix.
Try adosbegin.lha (Amigados for beginners) a comprehensive guide and index of amigados commands with examples. This is a great guide.
Get KingCon immidiately. It can replace the standard shell window with a much better one. It adds a scrollbar to the command window and does linux-like auto complete with the tab key. Essential.
Also try UnixDirs3. It's a simple patch to enable unix-like directory commands in the shell like "cd .." very useful. Also you can use * as a wildcard (the amiga standard is #? or something I forget)
Also try pipe-1.5 which adds proper unix-like self flushing pipe functionality.
Another is ls-4.7LJR, a very good ls command. There are also some ports of grep available.
Lastly, Executive is a unix-like task manager and scheduler that gives you a proper process list and kill command amongst other things, and runs multitasking more smoothly. This really works, you should try it.