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  1. or download this
    use Carp;
  2. or download this
    opendir (DIR, $path) or croak "Unable to open $path: $!\n";
  3. or download this
    #!/usr/bin/perl
use strict;
...
 print "$0 started at " . (localtime) . "\n";
 processFiles(@ARGV);
 print "$0 finished at " . (localtime) . "\n";