TLDR
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tshark

 
Packet analysis tool, CLI version of Wireshark. More information: https://tshark.dev/.
 
  • Monitor everything on localhost:
     
    tshark
     
  • Only capture packets matching a specific capture filter:
     
    tshark -f '{{udp port 53}}'
     
  • Only show packets matching a specific output filter:
     
    tshark -Y '{{http.request.method == "GET"}}'
     
  • Decode a TCP port using a specific protocol (e.g. HTTP):
     
    tshark -d tcp.port=={{8888}},{{http}}
     
  • Specify the format of captured output:
     
    tshark -T {{json|text|ps|…}}
     
  • Select specific fields to output:
     
    tshark -T {{fields|ek|json|pdml}} -e {{http.request.method}} -e {{ip.src}}
     
  • Write captured packet to a file:
     
    tshark -w {{path/to/file}}
     
  • Analyze packets from a file:
     
    tshark -r {{filename}}.pcap

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