Not really a shell one liner, but ctrl+r (a readline command to do an incremental search backwards through history) is something that has been present on every shell I've used for decades without realising it, One day I decided to take the time to read all the magic readline commands because I wanted a way to quickly edit the N-th argument of a command with lots of arguments, and there were way too many of them. Ther…
No need to be fancy. These are super practical! ctrl+r is a lifesaver once it clicks, and cd - is such a small thing that makes moving around so much smoother.