Linux下检查进程是否正在运行，有异常重新启动

以snmpd进程为例，以下脚本检查进程状态是否为running，如果不是则重新启动进程。

#!/bin/bash
SNMPD=`systemctl status snmpd | grep Active | awk '{print $3}' | cut -d "(" -f2 | cut -d ")" -f1`
if [ "$SNMPD" == "running" ]
        then
            echo "snmpd service is running..." 
        else
            systemctl restart snmpd
fi