A game popular among hackers who code in the language APL (see write-only language and {line noise}).The objective is to see who can code the most interesting and/or useful routine in one line of operators chosen from APL' s exceedingly hairy primitive set.A similar amusement was practiced among TECO hackers and is now popular among Perl aficionados.Ken Iverson, the inventor of APL, has been credited with a one-liner that, given a number N, produces a list of the prime numbers from 1 to N inclusive.It looks like this:(2 = 0 +.= T o.| T) / T <- iNwhere "o" is the APL null character, the assignment arrow is a single character, and "i" represents the APL iota.[Jargon File](2000-03-19)