tcpdump command on OSX returns syntax error

running the tcptump command example from this article on OSX (Yosemite) returns: syntax error.

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Turns out I had both wifi and ethernet connection running.  Command worked if I unplugged ethernet and therefore only had one network device.  (I assume I could equally have disabled wifi and used ethernet connection only.)

I had the same experience. New MacBook Pro, I was getting two interfaces coming back from the netstat/grep (en0 and utun0), and I wasn't able to figure out how to disable one and still have internet.

My solution was to replace everything in the `` with en0, and it successfully ran for me.

It appears that the command needs to be updated to allow for multiple interfaces being returned to tcpdump.

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