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HowTo: Flush Contents Of a Memcached Server Using Command Line

I‘ve installed memcached server under Linux, but it is still showing old data. How do I flush the contents of a Memcached instance / server on Linux or Unix-like systems?
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Linux and Unix Port Scanning With netcat [nc] Command

How do I find out which ports are opened on my own server? How do I run port scanning using the nc command instead of the nmap command on a Linux or Unix-like systems?
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