What is the most shell program you have ever used? To me it is zoxide. Zoxide is like `cd`, but instead of just `cd` to the path, zoxide also remember the path, so the next time you enter the name of the directory you `cd`ed with zoxide before, it will automatically teleports you to the path. Which is very useful because now I can just type `z uluto` instead of `cd ~/Projects/Python/uluto`.