I have run into multiple occurrences where I only want to see the IP Addresses in a given file. Today I found with the help of Command Line Fu a quick way to parse a file and only return the unique IP Addresses found:
cat tmp.txt | grep -Eo '([0-9]{1,3}\.){3}[0-9]{1,3}' | sort | uniq
Sometimes I will use this to quickly parse out IP Addresses in an email. The regulary expression can be changed to extract domain names out of an email also.
Twitter: @lokut
This blog is for educational purposes only. The opinions expressed in this blog are my own and do not reflect the views of my employers.
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