Use the following shell commands:

cd	change directory [dir_name]
cat	print file [file_name]
deleteme	delete all of your data associated with foobar
edit	open file in editor [file_name]
feedback	provide feedback on foobar
less	print a file a page at a time [file_name]
ls	list directory contents [dir_name]
request	request new challenge
status	print progress
submit	submit final solution file for assessment [file_name]
verify	runs tests on solution file [file_name]

Keyboard help:

Ctrl + S	save the open file [when editor is focused]
Ctrl + E	close the editor [when editor is focused]

Toggle between the editor and terminal using ESC followed by TAB, then activate with ENTER.