linux系统软件启动sh脚本

在系统维护中，编写脚本会帮助运维提高效率，现记录一个通用的软件启动脚本。脚本内容如下：

#!/bin/bash
# 软件启动程序包名称
APP_NAME=datadog-4.2.0.jar
# 软件名称
APP_NAME2=Datadog

usage() {
    echo "Usage: sh 执行脚本.sh [start|stop|restart|status]"
    exit 1
}

is_exist(){
  pid=`ps -ef|grep $APP_NAME|grep -v grep|awk '{print $2}' `
  if [ -z "${pid}" ]; then
   return 1
  else
    return 0
  fi
}

# 启动
start(){
  is_exist
  if [ $? -eq "0" ]; then
    echo "${APP_NAME2} is already running. pid=${pid} ."
  else
    nohup jre/bin/java -jar $APP_NAME >> run.log 2>&1 &
  fi
}

# 停止
stop(){
  is_exist
  if [ $? -eq "0" ]; then
    kill -9 $pid
  else
    echo "${APP_NAME2} is not running"
  fi
}

# 查看软件运行状态
status(){
  is_exist
  if [ $? -eq "0" ]; then
    echo "${APP_NAME2} is running. pid is ${pid}"
  else
    echo "${APP_NAME2} is not running."
  fi
}

# 重启，先停止再启动
restart(){
  stop
  start
}

case "$1" in
  "start")
    start
    ;;
  "stop")
    stop
    ;;
  "status")
    status
    ;;
  "restart")
    restart
    ;;
  *)
    usage
    ;;
esac