#!/bin/bash
 
#这里可替换为你自己的执行程序，其他代码无需更改

APP_PATH=/home/user/go/bin
APP_NAME="$APP_PATH/main"

cd $APP_PATH

#使用说明，用来提示输入参数
usage() {
    echo "Usage: sh [start|stop|restart|status]"
    exit 1
}
 
#检查程序是否在运行
is_exist(){
  pid=`ps -ef|grep $APP_NAME|grep -v grep|awk '{print $2}'`
  #如果不存在返回1，存在返回0     
  if [ -z "${pid}" ]; then
   return 1
  else
    return 0
  fi
}
 
#启动方法
start(){
  is_exist
  if [ $? -eq 0 ]; then
    echo "${APP_NAME} is running. Pid=${pid}"
  else
    nohup ${APP_NAME}  > /dev/null 2>&1 &
    echo "run ${APP_NAME}."
  fi
}
 
#停止方法
stop(){
  is_exist
  if [ $? -eq "0" ]; then
    kill $pid
    echo "try kill ${APP_NAME}. pid=${pid}"
    sleep 1s
    is_exist
    if [ $? -eq "0" ]; then
      kill -9 $pid
      echo "Skill kill ${APP_NAME}. pid=${pid}"
    else
      echo "${APP_NAME} is killed"
    fi
  else
    echo "${APP_NAME} is not running"
  fi
}
 
#输出运行状态
status(){
  is_exist
  if [ $? -eq "0" ]; then
    echo "${APP_NAME} is running. Pid=${pid}"
  else
    echo "${APP_NAME} is not running."
  fi
}
 
#重启
restart(){
  stop
  sleep 1s
  start
}
 
#根据输入参数，选择执行对应方法，不输入则执行使用说明
case "$1" in
  "start")
    start
    ;;
  "stop")
    stop
    ;;
  "status")
    status
    ;;
  "restart")
    restart
    ;;
  *)
    usage
    ;;
esac