How do the Is Commands work? what do you need to enter? I'm stuck, I don't know what "Folder" to enter :p It just tells me Error: Invalid Directory. Application not found in this users directory.
Like in a real Unix terminal, the command is ls (LS, as in LiSt) - you can see the explanation in the "help" command. :)
Also the bracketed text is meant to be an example - you shouldn't actually type in the brackets. So an example command for listing the contents of a directory would be:
ls /Alex/Applications
And an example for executing a program would be:
./Alex/Applications/Gem_Writer.play
Hope that helps!