using unix improved!
the unix file system
Directories in unix are usually called folders in Mac OS X and Windows. All of your files are in your home directory (/home/username) or any subdirectories you create. You can move to other directories in the file system using the cd command. Here are some simple examples.
cd .. : move up one dir cd : move back to your home dir (/home/username) cd /local : move to /local mkdir cs45 : make a new directory called cs45 cd cs45 : move into cs45 dir