Watch directory and evaluate command

watch.sh

#!/bin/bash

path="../grails-app"
command="grails compile"
chsum1=""

echo "Watching ${path} for changes"
while [[ true  ]]
do
  chsum2=`find ${path} -type f -exec md5sum {} \;`
  if [[ $chsum1 != $chsum2  ]] ; then
    date +"[%T] Running ${command}"
    eval "grails compile"
    chsum1=$chsum2
  fi
  sleep 2
done