Using the previous command to extract er_agent, this time extracting from a pcap rather than off the live interface. Parse User Agents and Frequency with Standard Shell Commands We could also use the parameter -E seperator=, to change the delimiter to a comma.
The default separator for the fields in the output above is TAB. Tshark -i wlan0 -Y http.request -T fields -e http.host -e er_agent Mozilla/5.0 (X11 Ubuntu Linux x86_64 rv:36.0) Gecko/20100101 Firefox/36.0
Using the -T we specify we want to extract fields, and with the -e options we identify which fields we want to extract. In the following example, we extract data from any HTTP requests that are seen. Capture Packets with Tshark tshark -i wlan0 -w capture-output.pcap Read a Pcap with Tshark tshark -r capture-output.pcap HTTP Analysis with Tshark As you can see, the syntax for capturing and reading a pcap is very similar to tcpdump.
Use these as the basis for starting to build your extraction commands.
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