Most linux-users know $OLDPWD. It's an environment variable to get the recently used directory. Sometimes it would be nice to remember more visited directories. In such cases pushd and popd would be a good choice..

Most common shells do have a directory stack. By looking in the man-page of bash I found the following description of the DIRSTACK:

A sysadmin needs his tools.  I really need at least 3 tools to be productive:

1. Terminal-Emulator (or screen/tmux if I am working without X)
2. Shell
3. Editor

This is my Rule Of Three. Those 3 tools can make my life much easier. Therefore I have to choose those tools wisely. And of course I have to know them very well, so I can get all the benefits of them. In this article I want to introduce one of my "favourite" shells: zsh