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Use a laptop as a mobile wireless power meter
Authored by: hgregorian on Apr 10, '10 07:55:42AM
Great hint, thank you!

I modified the command a bit to simply show the current RSSI dBm value as opposed to a running list:
clear; while x=1; do /System/Library/PrivateFrameworks/Apple80211.framework/Versions/Current/Resources/airport -I | grep CtlRSSI | sed -e 's/^.*://g' | xargs -I SIGNAL printf "\rRSSI dBm: SIGNAL"; sleep 0.5; done

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