@Mick
You really need some documentation! Amiga OS is famous for its eligant design and features. This includes the textural Command Line Interface (CLI or Shell) as well. The syntax is easy and well thought-out, one of the best on any platform. You can issue any command with a ? after it (that's COMMAND space question-mark, grin) to get a listing of valid parameters, but, you need some info to interpret the listing. OS 1.3 relied more heavily on the CLI to suppliment the features of Workbench.
You should find some books on e-bay.
"The Amiga Dos Manual" any edition, the commands are the same
"The Amiga Companion" Rob Peck, excellent tutorials and useful examples
"AmigaDos" Commodore, very good, many copies published
"Introduction to the Amiga 500" Commodore, general operations
Any of these would be an excellent reference for the CLI, writing script files, etc. I don't know how you'll get along without one.
"Best Amiga Tips and Tricks" Denny Adkins, not about CLI but excellent anyway
@ anyone
Are any of these books reproduced on-line? I didn't see these kinds of specifics on Amiga-wiki.