Is there a quick tcpdump one-liner to print out a TCP stream that matches a particular substring — or, if that’s not easy, how about printing out just the single TCP packet that matches the substring?
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Is there a quick tcpdump one-liner to print out a TCP stream that matches a particular substring — or, if that’s not easy, how about printing out just the single TCP packet that matches the substring?
The best option is to use ngrep rather than tcpdump. Ngrep is designed to do exactly what you’re after.