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http://www.techrepublic.com/article/how-to-quickly-audit-a-linux-system-from-the-command-line/
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http://www.techrepublic.com/blog/10-things/10-outstanding-open-source-server-tools/
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RHEL7 Security Guide - Chapter 7. Compliance and Vulnerability Scanning with OpenSCAP
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A curated list of awesome malware analysis tools and resources.