history

If you can't remember your command line syntax, this will be a helpful trick. Which I recently saw a coworker using.

history | grep lsof

If you forgot that lsof syntax (was it -n or tcp:3000?), you can run history. It will return the commands in history filtered by keyword lsof.

history | grep lsof | tail -5

For last 5 commands (including the previous).

-FIN-