Monitor files, rerun script when they are modified

watch.sh

#!/bin/bash
# find --
split="-1"
for (( i = 0; i < ${#@}; i++ )); do
  if [ "${!i}" == "--" ]
  then
    split=$i
    i=${#@}
  fi
done

if [ "$split" == "-1" ]
then
  echo "Missing --"
  echo "Expected $0 files ... -- command..."
  exit 1
fi

FILES=${@:1:$split-1}
shift $split

function quit () {
  end
  exit 0
}
trap quit SIGINT

PID=0
function end() {
  if [ $PID -ne 0 ]
  then
    kill $PID 2>&1 >/dev/null
    echo "Killed $PID"
  fi
}

function begin() {
  $* &
  echo "Started $*"
  PID=$!
}

begin $*
while true
do
  inotifywait -q -e MODIFY ${FILES[@]}
  end
  begin $*
  sleep 5
done