Date: Sat, 2 Apr 2022 16:41:38 -0400 (EDT) From: Daniel Feenberg <feenberg@nber.org> To: Robert Huff <roberthuff@rcn.com> Cc: questions@freebsd.org Subject: Re: extracting an IPv4 address from text? Message-ID: <69e069b9-49a5-cc90-73c-ad4da09ae9e4@nber.org> In-Reply-To: <25160.44484.392802.868667@jerusalem.litteratus.org> References: <25160.44484.392802.868667@jerusalem.litteratus.org>
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On Sat, 2 Apr 2022, Robert Huff wrote: > > Hello: > Let's suppose I want to parse a line from auth.log and extract > the IP address (if any) to stdout. > I'm assuming there is a robust way to do this using standard > command-line tools ... but my brain is flailing on the exact method. > Anyone have a example they'd be willing to share? Or is this a > problem already solved? How about: cat auth.log | tr " " "\n" | grep "\." | grep -v "\[" | grep -v "[a-zA-Z]" or something similar, although I am sure there will be a few strays slip through. Daniel Feenberg
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