Benchmark: timing 30 iterations of 
 Shell find pipe, 
 _ Opendir recursion, 
 __ File::Find module...
 29485
 Shell find pipe:
  7 wallclock secs ( 0.56 usr  0.40 sys +  1.03 cusr  3.87 csys =  5.86 CPU) @  5.12/s (n=30)
 29485
 _ Opendir recursion:
 12 wallclock secs ( 3.79 usr +  5.63 sys =  9.42 CPU) @  3.18/s (n=30)
 29485
 __ File::Find module:
 20 wallclock secs ( 8.17 usr +  7.32 sys = 15.49 CPU) @  1.94/s (n=30)