Simply disconnecting your connection can create problems. If you do not logout, when you reconnect, bye from the prompt or x from the menus will close all of your open connections. Below is a listing of some basic UNIX commands. UNIX is very sensitive when it comes to character cases. All UNIX commands I have seen are in lower case.
Some commands have upper case options.
This manual shows you usage and other options. Directories cannot be undeleted. Note files cannot be undeleted. This displays your current directory. This moves the file myfile to the mail directory.