gistfile1.sh

#!/bin/bash
# WiFi Hunter
# ===========
# 
# Scans for unprotected Access Points in your neighborhood and alerts you
# when it finds something good for you :)
#                                                       -- ideamonk at gmail.com

export MPLAYER_VERBOSE=0

refreshReport()
{
  ap_list=`iwlist wlan0 scanning | grep ESSID`
  ap_count=`iwlist wlan0 scanning | grep ESSID | wc -l`
  hole_list=`iwlist wlan0 scanning | grep -e 'Encryption key:off' -B 6 | grep 'ESSID'`
  hole_count=`iwlist wlan0 scanning | grep 'Encryption key:off' | wc -l`
}

showReport()
{
  echo "Total $ap_count APs "
  echo "APs - " $ap_list | sed -e s/ESSID://
  echo $hole_count " Unprotected APs"
  if [ $hole_count -gt 0 ] ; then
    echo "Unprotected ones -- " $hole_list | sed -e s/ESSID://
  fi
  echo "------------------------------------------------------------------"
}

refreshReport
showReport

echo 
echo "Scanning now ... "

oldcount=0

while [ 1 -eq 1 ] ; do
  refreshReport
  if [ $ap_count != $oldcount ] ; then
    oldcount=$ap_count
    if [ $hole_count -gt 0 ] ; then
      mplayer '/usr/share/sounds/ubuntu/stereo/system-ready.ogg' -quiet -msglevel all=-1 >&/dev/null
      # Yay I can haz stderr redirection too, complete silence :D >& FTW
      # &> redirection works only with bash though
      echo '++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++'
      echo "                      --== FOUND SOMETHING ==--"
    fi
    showReport
    echo
    echo "Scanning for more..."
  fi
done