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<a href="http://www.emh.co.kr/content.pl?perl_file_directory">File handle, directory working and globbing</a><br />
<a href="http://gypark.pe.kr/wiki/Perl/%EC%A0%95%EA%B7%9C%ED%91%9C%ED%98%84%EC%8B%9D">Regular expression</a><br />
<a href="http://stackoverflow.com/questions/2474424/how-can-i-convert-between-scientific-and-decimal-notation-in-perl">Convert between scientific and decimal notation</a><br />
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