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  1. or download this
    use strict;
use warnings;
...
system 'gswin32c', '-q', '-sDEVICE=pdfwrite', '-o', $out_fn, $in_fn;

# now do something useful with out.pdf
  2. or download this
    use strict;
use warnings;
...
    };
print "*** STDOUT ***\n$out\n";
print "*** STDERR ***\n$err\n";
  3. or download this
    use strict;
use warnings;
...
print do { local $/; <$out> };
close $out;
waitpid( $pid, 0 );