linux启动停止脚本模板

#命令的位置
CMD="java -jar x.jar"
#参数空格隔开
ARGS=""
#命令日志文件
LOG_FILE="./start.log"
#pid文件
PID_FILE="./PID"
PID=""

setup_pid() {
  PID=$1
  kill -0 $PID > /dev/null 2>&1
  local exit_code=$?
  if [ "$exit_code" == "1" ]; then
    if [ -f $PID_FILE ]; then 
        rm -f $PID_FILE
        fi
    PID=""
  fi
}

exit_by_error() {
  echo "error: $1"
  exit 1
}

start() {
    if [ -n "$PID" ]; then
        exit_by_error "process is running, pid is $PID"
        exit 1
    fi
    touch $LOG_FILE
    echo "starting..."
    nohup $CMD $ARGS > $LOG_FILE 2>&1 &
    local pid=$!
    setup_pid $pid
    if [ -n "$PID" ]; then
        echo "process started! pid is $PID"
        echo $PID > $PID_FILE
    else
        exit_by_error "start faild!"
    fi
    tail -f $LOG_FILE   
}
stop() {
    echo "stopping..."
    if [ -n "$PID" ]; then
        kill -9 $PID
    fi
    if [ -f $PID_FILE ]; then 
         rm -f $PID_FILE
         PID=""
    fi
    echo "stopped!"
}
restart() {
    stop
    start
}
status() {
  if [ -n "$PID" ]; then
      echo "process is running, pid is $PID"
  else
      exit_by_error "process not running!"
  fi
}

if [ -f $PID_FILE ]; then
   PID=$(cat $PID_FILE)
   if [ -n "$PID" ]; then
        setup_pid $PID
   fi
   if [ "$PROCESS_STATUS" == "1" ]; then
    rm -f $PID_FILE
    PID=""
   fi
fi

case $1 in

    start)
    start
    ;;

    stop)
    stop
    ;;

    restart)
    restart
    ;;
    status)
    status
    ;;
    *)
    echo "Usage command:start|stop|restart|status"
    exit 1

esac
exit 0