shell判断程序/服务是否运行

由于目前多组件的开发模式，导致一个服务可能是由多个组件同时支持的，所以判断这些组件的正常运行就变得比较重要了，之前是根据数据流向，由源头开始判断，命令繁琐，且时间长了，命令也就不记得了。所以想编写一个脚本，进行服务的status判断：

以agent+kafka +tomcat为例：

#!/bin/bash

serviceListening(){
   command=`netstat -ln|grep $2`
   if [  "$command" == "" ]
   then
	echo -e "33[31m$1 not started 33[0m" 
   else
	echo "$1 is started"
   fi
	
}

serviceStatus(){
 command=`ps aux|grep $2 |grep -v "grep"`
   if [  "$command" == "" ]
   then
	echo -e "33[31m$1 not started 33[0m" 
   else
        echo "$1 is started"
   fi

}
#listen port
#DB
echo -e  "33[32mDB status33[0m"
serviceListening mysql 3306
#Component 
echo -e  "33[32mComponent status33[0m"
serviceListening kakfa 9092
serviceStatus agent appmaster
#web
echo -e  "33[32mWEB status33[0m"
serviceListening tomcat 80

输出：

DB status
mysql is started
Component status
kakfa is started
agent not started 
WEB status
tomcat not started