检测nginx是否正常，如果不正常则自动重启
#!/bin/bash
nginx=`netstat -tnlp | grep 80 | grep nginx | wc -l`
if [ "$nginx" -gt 0 ];then
echo "Nginx is running..."
else
echo "Nginx is stopped"
/application/nginx/sbin/nginx
fi
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原文：http://liuzhengwei521.blog.51cto.com/4855442/1771500