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Home/ Questions/Q 98763
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Asked: May 11, 20262026-05-11T00:15:30+00:00 2026-05-11T00:15:30+00:00

How to extract a text part by regexp in linux shell? Lets say, I

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How to extract a text part by regexp in linux shell? Lets say, I have a file where in every line is an IP address, but on a different position. What is the simplest way to extract those IP addresses using common unix command-line tools?

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  1. 2026-05-11T00:15:31+00:00Added an answer on May 11, 2026 at 12:15 am

    You could use grep to pull them out.

    grep -o '[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}' file.txt 
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