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ecdaf991c6
Added a few builtin functions to the shell to make navigating a bit easier in the terminal. `pushd` allows a user to "push" the current directory to the directory stack, and then `cd` to the new directory. `popd` allows the used to take the directory on the top of the stack off before `cd`'ing to it. `dirs` gives the state of the current directory stack. This is only a partial implementation of the `bash` version (gnu.org/software/bash/manual/html_node/Directory-Stack-Builtins.html) , and doesn't include any of the +N or -N commands as of yet.