Mint comes with dir aliased for ls, and the only other one I regularly use is cls for clear.

Yes I grew up on DOS, how can you tell?

People type clear instead of CTRL+l?

I’ve never had a terminal that that didn’t work in. Or at the very least have a shortcut be able to be set for.

CTRL+L and clear command do two different things (at least when using Bash on Debian):

  • CTRL+L scrolls the terminal output one screen so you don’t see your previous output;
  • clear does indeed clear a screen, and your previous command history is available only through the history command.

If you want CTRL+L to clear your screen you can add following to the .bashrc:

bind -x ‘“\C-l”:clear’

Note that it might not work if you use Vi mode inside Bash.