anchor.diff:    fi
     lxc-attach --name "$id" -- "${command[@]}"
   }
  +
   function stop_container {
     if [[ "$1" == 'all' ]]; then
       ${DOCKER} stop ${CONTAINER_NAMES[$1]}
  
positive.code:   echo ${CONTAINER_NAMES[$1]}
  }
  
  function container_created {
    ${DOCKER} ps -a | grep -q $1
    return $?
  
negative.code: }
  
  function shell_container {
    id=$(get_container_id "$1")
    if [ $? -ne 0 ]; then
      echo "Could not get docker ID for $container. Is it running?" 1>&2
      return 1
    fi
    if [ -z "$2" ]; then
      command="/bin/bash"
  