When you know the absolute or relative pathname of a file or directory, you can move up and down the UNIX directory tree. You can change your working directory to a parent or child directory or to another user's directory with the cd (change directory) command.
The cd command is followed by an absolute or a relative pathname to the directory you want to change to. Use the form that is most convenient for you at that time.
Note that you can only change to another directory.