How Do I Know If I'm Running Centos?
Linux operating systems come in a wide variety of types and versions, and unless you installed the operating system yourself it can be difficult to discern which one you are running. Fortunately, the "uname" command (universal across all Linux operating systems) can tell you if you are running CentOS, Mandriva, Ubuntu or any of the other Linux versions that exist today.
Instructions
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Log in to your Linux computer.
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Open a command-line terminal from the system menu.
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Type "uname -o" on the terminal and press "Enter." The operating system name ("CentOS" if that is what you are running) is displayed.
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