How can I pass a parameter to the wanted function when using Perl's File::Find?

Question

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How do I pass parameters to the File::Find subroutine that processes each file?

One can use Perl's File::Find module like this:

find( \&wanted, @directories);

How can we add a parameter to the wanted function?

For example, I want to traverse the files in /tmp extracting some information from each file and the result should be stored to a different directory. The output dir should be given as a parameter.

Answer 1

You use a closure:

use File::Copy;

my $outdir= "/home/me/saved_from_tmp";
find( sub { copy_to( $outdir, $_); }, '/tmp');

sub copy_to
  { my( $destination_dir, $file)= @_;
    copy $file, "$destination_dir/$file" 
      or die "could not copy '$file' to '$destination_dir/$file': $!";
  }