Quickly go back to a specific parent directory instead of typing cd ../../..
redundantly.
This is a reimplementation of vigneshwaranr/bd that utilizes the power of the zsh shell.
Usage
$ mkdir -p a/b/c/d
$ cd a/b/c/d
$ bd b
$ ls
c
$ cd c/d
$ bd 2
$ ls
c
Here's an animation also showing the completion functionality
Thanks
Thanks to @vigneshwaranr for inspiring me to do a zsh version.
Thanks to @voria for many useful patches! (see commit log)