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I take it that you are using Tshark even though you have mentioned, "I need to select the wifi when Wireshark starts..".
Have you tried this: tshark -i "WIFI INTERFACE" ?
Alternatively, you can do this: tshark -D . [This will list the index of the all the network interfaces; mark the wifi one -- say 2] tshark -i 2 ....
I take it that you are using Tshark even though you have mentioned, "I need to select the wifi when Wireshark starts..".
Have you tried this: tshark -i "WIFI INTERFACE" ?
Alternatively, you can do this: tshark -D . [This will list the index of the all the network interfaces; mark the wifi one -- say 2] tshark -i 2 ....