rm -r *

Also, if you have to type that, don’t use the numpad: / is only one key away from *. If you finger snags the / key on its way to * and you happen to be root, your root partition will go bye-bye.

Here’s a rule I learned the hard way a few decades ago:

• If you type “rm”, take you hands off the keyboard and take one deliberate breath before continuing your command.
• If you then type “-r”, do it again.
• If you then type “-f” do it again.
• In all cases, re-read what you wrote before hitting ENTER.