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  1. or download this
    use strict;
    use warnings;
    ...
      system ($comm);
      print "$?\n";
    }
    
  2. or download this
    $ perl test.pl file.txt
    
  3. or download this
    $ perl test.pl file\ name.txt
    
  4. or download this
    if (isReadableFile ($ref_file)) {
      $ref_file =~ s/ /\\ /g;  ###### Added
    ...
    } else {
      print STDERR "$ref_file Does not exist\n";
    }