Quickly and easily move to commonly used directories

If you're constantly typing out long paths to change to commonly used directories, there's an easier way.

For example, if you launch your terminal and constantly have to type:

cd /path/to/project_name

Well there's a quick and easy way to do it:

z project_name

This command has saved me a lot of time, and now it can for you too, the script is available for bash and zsh and can be found here: https://github.com/rupa/z/