NetCat
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http://www.ol-service.com/sikurezza/doc/netcat_eng.pdf
http://blog.fsck.hu/index.php/tag/netcat/
http://www.sans.org/security-resources/sec560/netcat_cheat_sheet_v1.pdf
http://www.g-loaded.eu/2006/11/06/netcat-a-couple-of-useful-examples/
http://en.wikipedia.org/wiki/Netcat