That doesn't work if . is at the end of $PATH though? Since the real ones would take precedence due to how executable searching works...?
SL(6) Games Manual SL(6)
NAME
sl - display animations aimed to correct users who acci-
dentally enter sl instead of ls.That said, I also don't actually put "." in my path, though this is mainly so I can avoid heisenbugs rather than a security concern...