Using pushd, popd and dirs

Since I have a bit of time on my hands, I thought I might share a trick or two.  Well, not really 'tricks,' but good information to know. I will cover the shell builtins, pushd, popd, and dirs for bash and zsh. Additionally, I will demonstrate how to use some shell aliases, in order to make the use of these handy builtins even more convenient, and time saving.