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reverse dns lookup

My ecommerce site runs using a cluster of Apache web server. The cluster is behind nginx load balancer. I want to merge backend Apache web server log files for statistics purpose. How do I mere web server log files under Linux / UNIX like operating systems using cron jobs?
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HowTo Test or Check Reverse DNS on a Linux / Unix

I am a new Linux and Unix command line user. How do I test or check reverse DNS for given IP address under Linux, OS X, BSD, Unix-like or Windows XP/Server 2003 based systems?
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