How to find Linux os series?

hai
how to find linux os series

Your question makes no sense. Try to restate it in depth.

If by "os series" you mean the name of a particular linux distribution, there is no easy way of definitively doing it. You have to write a shell script that checks for and parses various files in /etc to try and determine the name of the distribution.

The current version is registered in /etc/redhat-release.

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I just saw this was a double post. Please be considerate of our time when asking questions.