Most UNIX commands use the following format. The options and arguments are not always required. Commands, options, and arguments are case sensitive. Options can usually be expressed in any order and may be combined.
Some options require an argument which then requires an order to options and arguments.
Multiple commands may be issued on a single line by separating the commands with a semicolon. Many commands take a filename as an argument if the command will be using a file for input. The stdin is typically the keyboard.