Hello,

<end code snippet>

Please try to write cleaner code, its hard to read :) (See "Perl Best Practices" by Damian Conway, Oreilley)

<error:>
undefined subroutine &main::copy

What could be the mistake?

a) FILE::copy probably doesn;t exist but rather: File::Copy

b) you have not imported copy() into main::
  solution:

   1) import it into main:: -  use File::Copy qw(copy);
2) Call it by its full name: - File::Copy::copy($filea, $fileb) or warn ...

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