This is how you leave the system. This lists all the files in the current directory. It is like the DOS dir command. This creates a new directory. Say mkdir dirname to create a new directory named dirname .
Directories are the same thing as folders in Windows terminology.
They allow you to collect related files in one place. The command cd dir changes the current directory to be dir . This is like DOS delete . The script command places a script of your session into a file, which you can then edit or print. Everything you type, and everything the computer types, exactly as it appears on the screen, is placed into the file.