Minecraft startscript

#Settings
SERVICE='Infinity.jar'
SCREEN='infinity'
USERNAME='root'
WORLD='world'
MCPATH='/root/FTB/Infinity'
MAXHEAP=6144
MINHEAP=2144
HISTORY=2048
CPU_COUNT=4
INVOCATION="java -Xmx${MAXHEAP}M -Xms${MINHEAP}M -XX:+UseConcMarkSweepGC \
-XX:+CMSIncrementalPacing -XX:ParallelGCThreads=$CPU_COUNT -XX:PermSize=256M \
-jar $SERVICE $OPTIONS"

ME=`whoami`
as_user() {
  if [ $ME == $USERNAME ] ; then
    bash -c "$1"
  else
    su - $USERNAME -c "$1"
  fi
}

mc_start() {
  if  pgrep -u $USERNAME -f $SERVICE > /dev/null
  then
    echo "$SERVICE is already running!"
  else
    echo "Starting $SERVICE..."
    cd $MCPATH
    as_user "cd $MCPATH && screen -h $HISTORY -dmS $SCREEN $INVOCATION"
    sleep 7
    if pgrep -u $USERNAME -f $SERVICE > /dev/null
    then
      echo "$SERVICE is now running."
    else
      echo "Error! Could not start $SERVICE!"
    fi
  fi
}

mc_stop() {
  if pgrep -u $USERNAME -f $SERVICE > /dev/null
  then
    echo "Stopping $SERVICE"
    as_user "screen -p 0 -S $SCREEN -X eval 'stuff \"say SERVER SHUTTING DOWN IN 30 SECONDS.\"\015'"
    sleep 10
    as_user "screen -p 0 -S $SCREEN -X eval 'stuff \"say SERVER SHUTTING DOWN IN 20 SECONDS.\"\015'"
    sleep 10
    as_user "screen -p 0 -S $SCREEN -X eval 'stuff \"say SERVER SHUTTING DOWN IN 10 SECONDS. Saving map...\"\015'"
    sleep 1
    as_user "screen -p 0 -S $SCREEN -X eval 'stuff "save-all"\015'"
    sleep 10
    as_user "screen -p 0 -S $SCREEN -X eval 'stuff "stop"\015'"
    sleep 7
  else
    echo "$SERVICE was not running."
  fi
  if pgrep -u $USERNAME -f $SERVICE > /dev/null
  then
    echo "Error! $SERVICE could not be stopped."
  else
    echo "$SERVICE is stopped."
  fi
}

mc_command() {
  command="$1";
  if pgrep -u $USERNAME -f $SERVICE > /dev/null
  then
    pre_log_len=`wc -l "$MCPATH/logs/latest.log" | awk '{print $1}'`
    echo "$SERVICE is running... executing command"
    as_user "screen -p 0 -S ${SCREENNAME} -X eval 'stuff \"$command\"\015'"
    sleep .1 # assumes that the command will run and print to the log file in less than .1 seconds
    # print output
    tail -n $[`wc -l "$MCPATH/logs/latest.log" | awk '{print $1}'`-$pre_log_len] "$MCPATH/logs/latest.log"
  fi
}


#Start-Stop here
case "$1" in
  start)
    mc_start
    ;;
  stop)
    mc_stop
    ;;
  restart)
    mc_stop
    mc_start
    ;;
 status)
    if pgrep -u $USERNAME -f $SERVICE > /dev/null
    then
      echo "$SERVICE is running."
    else
      echo "$SERVICE is not running."
    fi
    ;;
 check)
    if pgrep -u $USERNAME -f $SERVICE > /dev/null
    then
      echo "$SERVICE is running. All is fine"
    else
      echo "$SERVICE is not running. Will be started now."
      mc_start
    fi
    ;;
  command)
    if [ $# -gt 1 ]; then
      shift
      mc_command "$*"
    else
      echo "Must specify server command (try 'help'?)"
    fi
    ;;

  *)
  echo "Usage: $0 {start|stop|restart|Status|check|command \"server command\"}"
  exit 1
  ;;
esac

exit 0