>>>>> "R" == Richard Hensh <hensh / math.msu.edu> writes:

R> what should the output be from the following commands?

R> Dir.chdir("my_dir")
R> Dir["*"]
R> Dir["**"]

 The same, "**" is "magic" only when there is "/" in the pattern.

 Try 

  Dir["*/*"]
  Dir["**/*"]


Guy Decoux