Toggle WiFi on and off from the command line

toggle-wifi.sh

# simple commands to (dis)connect from wifi network
# docker-machine and docker are unable to handle the changing ip addresses :(
# but once, disconnect and reconnect everything is happy in paradise :)
wifi_off() {
  netsh wlan show interfaces > /tmp/wifi_status
  status=$(awk -F: '/State/ {gsub(/^ *| *$/, "", $2); print$2; }' /tmp/wifi_status)
  name=$(awk -F: '/Name/ { gsub(/^ *| *$/, "", $2); print$2; }' /tmp/wifi_status)
  if [ "$status" = "connected" ]; then
      netsh wlan disconnect interface="$name"
  fi
}
wifi_on() {
  netsh wlan show interfaces > /tmp/wifi_status
  status=$(awk -F: '/State/ {gsub(/^ *| *$/, "", $2); print$2; }' /tmp/wifi_status)
  name=$(awk -F: '/Name/ { gsub(/^ *| *$/, "", $2); print$2; }' /tmp/wifi_status)
  if [ "$status" = "disconnected" ]; then
    netsh wlan show networks > /tmp/wifi_nets
    grep -E 'one|two|three' /tmp/wifi_nets > /tmp/known_hotspots
    if [ $? -eq 0 ]; then
      ssid=$(sed 's/^[^:]*: //' /tmp/known_hotspots)
      netsh wlan connect Name="$ssid" SSID="$ssid" interface="$name"
    else
      echo 'No known hotspots to connect'
    fi
  fi
}
wifi() {
  case $1 in
    on)  wifi_on
         ;;
    off) wifi_off
         ;;
    *)   echo 'Usage: wifi [on|off]'
         ;;
  esac
}