Discover Chromecast with devicename via mDNS

discover-chromecast.sh

#! /bin/sh

if ! which dns-sd > /dev/null
then
  echo "Requires dns-sd"
  exit
fi

if (( $# < 1 )) ; then
  echo "Requires devicename as an argument"
  exit
fi

deviceName=$*

timeout=5
fifo=/tmp/discover.fifo
rm -f $fifo
mkfifo $fifo

dns-sd -G v4 "$deviceName".local >$fifo &
pid1=$!

while read line; do
  case $line in *.local*)
    echo $line | cut -d ' ' -f 6
    break
  esac
done <$fifo &
pid2=$!

sleep $timeout && kill $pid1 $pid2 &
pid3=$!

wait $pid2
kill $pid3