This is you window to the host computer. An indepth list of Unix commands is provided in Chapter Two . Unix is case sensitive. That is, all commands must be entered exactly as specified. Thus, the command ls is not the same as LS .
Most commands provide options to their default behavior.
In Unix, you specify an option using a switch. A switch is indicated by a dash preceeding a single letter or word. Most commands and applications available under Unix have help files. In Unix, the help files are called manual pages. These pages, contain information about the command or application, the command line switches for starting it, and other important details.