sudo tshark -i wlan0mon -Y 'wlan.fc.type_subtype == 4' -T fields -e wlan.ssid -l 2>/dev/null | egrep -v --line-buffered "^$|^dlink$" | sudo tee -a probes.txt
sudo tshark -i wlan0mon -Y 'wlan.fc.type_subtype == 4' -T fields -e wlan.ssid -l 2>/dev/null | perl -ne 'BEGIN{%h;$|=1} if (!$h{$_}) {$h{$_}=1; print $_;}' | sudo tee -a probes.txt