require "find"
Find.find("/usr/bin/") { |file| puts file }

[...]
/usr/bin//rmdir
/usr/bin//rm
/usr/bin//mv
/usr/bin//mknod
/usr/bin//mkfifo
/usr/bin//mkdir
/usr/bin//ls
/usr/bin//ln
/usr/bin//install
/usr/bin//du
/usr/bin//dircolors
/usr/bin//dir
/usr/bin//df
/usr/bin//dd
/usr/bin//cp
[...]

I ran into this while doing string compares between filenames obtained
from File.find and filenames obtained elsewhere. Needless to say they
didn't compare very well :)

FWIW, GNU's find, BSD's find, and perl's find all produce the same output
for "/usr/bin" and "/usr/bin/".

-Jeff