To change your working directory (where we are standing in our tree-shaped maze) we use the
cd command: Type
cd followed by the pathname of the desired working directory. A pathname is the route we take along the branches of the tree to get to the directory we want. Pathnames can be specified in one of two ways, as absolute pathnames or as relative pathnames. Let’s deal with absolute pathnames first.
An absolute pathname begins with the root directory and follows the tree branch by branch until the path to the desired directory or file is completed. For example, there is a directory on your system in which most of your system’s programs are installed. The pathname of that directory is /usr/bin ...