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tshark

Packet analysis tool, CLI version of wireshark.

Monitor everything on localhost:

tshark

Only output captured packets matching a specific wireshark 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 {{file_name}}.pcap