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http://undeadly.org/cgi?action=article&sid=20041204022202
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http://www.wiredyne.com/software/chrootbuilder.html
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http://home.zyrianes.net/cgi-bin/wkcgi.cgi/Article/143.html
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http://www.zeroflux.org/knock
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http://shfs.sourceforge.net
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http://www.kernel.org/pub/linux/libs/pam/Linux-PAM-html