" And then one day, hooray! Another way for gnomes to say hooray! " -- Syd Barret, The Gnome
If you are unfamiliar with what a particular command actually does or what arguments it accepts, you can check quickly by using the electronic manual. GNO/ME includes a utility called man which displays the manual pages for a command whose name you supply as an argument. The man utility uses another utility called more to actually display the pages nicely on the screen.