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Extract IP address

Submitted by sandip on Tue, 05/15/2012 - 15:22

One liner with grep to extract the IP addresses from a file.

grep -Eo '([0-9]{1,3}\.){3}[0-9]{1,3}' /path/to/file

The "-o" option prints only the matched parts.

One liner with perl:

perl -ne 'print if s/.*((\d{1,3}\.){3}\d{1,3}).*/\1/' /path/to/file

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Extract "to", "from" and "ctladdr" emails from maillog

Submitted by sandip on Wed, 01/28/2015 - 10:37.

Grep using "-P", Perl regexp so the non-greedy ".*?" expression works:

grep -Po '(to|from|ctladdr)=<.*?>' /var/log/maillog

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