Of all the Linux commands, rm is notorious. It's easy to completely wipe out your system with one mislaid rm command as root.

Sudo is one of the most powerful and dangerous tools in the Unix or Linux system administrator's toolbox. With it, an ordinary user can run commands just as if he or she were the superuser or any ...

I accidentally did "sudo rm -r *" in my home directory, wiping out basically everything except ~/Library that was in use thus could not be deleted. This was in Mac OS X 10.2. I immediately rebooted ...