PopD - Recieves the newest directory from the stack and changes dir to it

Usage: popd

Changes the current working directory to the directory most recently added
to the stack. You can display the current stack with the dirs command.

Examples:
 1.Workbench:> pushd ram:
 1.Ram Disk:> pushd work:
 1.Work:> popd
 1.Ram Disk:> popd
 1.Workbench:>