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What does tshark -D show for interfaces? On my computer, the wireless interface is enumerated as interface 5, something like so:

5. \Device\NPF_{...} (WiFiInterfaceName)

So I could use any of these formats:

tshark -i 5 -w capture.pcap tcp port 12345
tshark -i \Device\NPF_{...} -w capture.pcap tcp port 12345
tshark -i WiFiInterfaceName -w capture.pcap tcp port 12345