Find available interfaces
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tshark -D

Execute tshark on a specific interface (i.e. interface #2 from results of above)
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tshark -i 2

Execute unattended tshark scan for 10 seconds (-a = autostop; -w = write to file)
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tshark -i 2 -a duration:10 -w 10secs.pcap

View 10secs.pcap
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type "10secs.pcap" in command prompt

Analyze traffic remotely over ssh w/ wireshark
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ssh root@server.com 'tshark -f "port !22" -w -' | wireshark -k -i -