How to find out AES-NI (Advanced Encryption) Enabled on Linux System

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The Intel Advanced Encryption Standard (AES) or New Instructions (AES-NI) engine enables extremely fast hardware encryption and decryption for openssl, ssh, vpn, Linux/Unix/OSX full disk encryption and more. How do I check support for Intel or AMD AES-NI is loaded in my running Linux in my Linux based system including openssl?