Acme has an idea of guide files in each directory which store commands you commonly use in that directory. Acme maps a mouse button to "send this text to sh", so you can edit a command in the guide file, highlight it with a sweep of the mouse while holding down the left button, then release the left button and middle-click to run it in the context of the current directory. Over the years this mechanism has greatly improved my retention and usage of interesting and powerful shell commands, and decreased to near zero the amount of time it takes to construct the command and the number of errors I make while doing so.