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Recently I was compiling a list of Linux commands that every sysadmin should know. One of the first commands that came to mind was nmap. nmap is a powerful network scanner used to identify systems and services. nmap was originally developed with network security in mind, it is a tool that was designed to find vulnerabilities within a network. nmap is more than just a simple port scanner though, you can use nmap to find specific versions of services, certain OS types, or even find that pesky prin...