one-liner wars

one-liner wars n.  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 <- iN

   where `o' is the APL null character, the assignment arrow is a
   single character, and `i' represents the APL iota.