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  1. or download this
    #!/usr/bin/env perl
    use 5.012;
    ...
       exit(EXIT_SUCCESS);
    }
    END_OF_C_CODE
    
  2. or download this
    one.txt
    two.txt
    
  3. or download this
    if (! defined $ARGV[0]){
        print "Usage: script.pl <directory>\n";
    ...
    my $str = listfiles($dir);
    
    ...