cool, maybe you have a beta release of OS 3.0 then? if you type "version" in the shell, what Kickstart and Workbench versions does it report?
The requester could be from some other program though.
Also as someone else mentioned, mostly all shell commands are in the C directory of your Boot harddrive, and it can be simply accessed by typing "C:" in the shell, some basic and often used AmigaDOS commands are:
copy
delete
rename
makedir
type
assign (if you type "assign test: ram:env", you can simply access ram:env by just typing test: (confusing explanation?))
info (shows info about the devices in your system)
showconfig (as patrik already mentioned, lists hardware)
status (shows processes running, sort of)
break (kill, sort of)
uhm, I hope this don't just make you more confused
