For those of you on OS X, I had to modify the command to the following: > sudo t... | Hacker News

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		liyanchang on March 17, 2015 \| parent \| context \| favorite \| on: Your wifi shows me where you live, work and travel For those of you on OS X, I had to modify the command to the following: > sudo tcpdump -l -e -I -i en0 \| grep 'Probe Request ([^)]' Not at all a tcpdump expert - fuddled around with manpages to make it work so others should please chime in with improvements.

ryan-c on March 17, 2015 [–]

try

sudo tcpdump -l -e -I -i en0 'type mgt subtype probe-req'

Way more efficient to use bpf instead of grep.

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