$ ./unzipper nonexistant.zip
IO error: opening nonexistant.zip for read : No such file or directory 
        Archive::Zip::Archive::read('Archive::Zip::Archive=HASH(0x8120258)','nonexistant.zip') called at /usr/local/lib/perl5/site_perl/5.8.0/Archive/Zip.pm line 522
        Archive::Zip::Archive::new('Archive::Zip::Archive','nonexistant.zip') called at /usr/local/lib/perl5/site_perl/5.8.0/Archive/Zip.pm line 211
        Archive::Zip::new('Archive::Zip','nonexistant.zip') called at ./unzipper line 6
Unable to open nonexistant.zip:   at ./unzipper line 6.