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How to check loaded and compiled modules in Apache or HTTPD in Linux?

This is a very common question and sometimes hard to find answer. How do you check which Apache modules are loaded in your HTTP / Apache server? The second part is, how do you check which modules are compiled and ready to be loaded? Following two commands will show you you can easily check loaded and compiled modules in HTTPD or Apache2 in any flavour of Linux such as CentOS, Ubuntu, Fedora, RedHat etc.