How to Grep an IP Address From a File in Linux

In this #Linux quick tip we will discuss how to grep and IP address from a file using regular expressions. We will show you some basic regex and why they fail. They we will show you extended regular expressions and how to ensure you to grep a valid IP address only.

Text version of this tutorial can be found here:
https://www.putorius.net/grep-an-ip-address-from-a-file.html

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ipv4

Source by Putorius Linux Tutorials