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It's a smarter `cd`. See also it's successor (AFAIK): https://github.com/rupa/z

It's probably autojump, or fasd

Autojump: https://github.com/joelthelion/autojump

Autojump : https://github.com/joelthelion/autojump

"autojump is a faster way to navigate your filesystem. It works by maintaining a database of the directories you use the most from the command line. Directories must be visited first before they can be jumped to."

https://github.com/joelthelion/autojump

(It's like a smart version of cd.)

Indeed, it is autojump. :)