Shell笔记4——if条件语句的知识和实践
# netstat -tnlp|grep -w 80|awk -F "[ :]+" '{print $5}'80
# netstat -tnlp|grep -w 80|wc -l
1
# netstat -tnlp|grep nginx|wc -l
1
# ss -lntup|grep nginx|wc -l
1
# ss -lntup|grep -w 80|wc -l
2
# lsof -i tcp:80|wc -l
4
# nmap 127.0.0.1 -p 80|grep open|wc -l
1
# echo -e "\n"|telnet 127.0.0.1 80 2>/dev/null |grep Connected|wc -l
1
# nc -w 2 127.0.0.1 80 &>/dev/null
# echo $?
0
# ps -ef | grep nginx|grep -v grep|wc -l
2
# ps -C nginx--no-header
8094 ? 00:00:00 nginx
8121 ? 00:00:00 nginx
# ps -C nginx --no-header|wc -l
2
#wget --spider --timeout=10--tries=2 http://127.0.0.1/index.html&>/dev/null
# echo $?
0
# wget -T 10 -q --spider http://127.0.0.1/index.html &>/dev/null
# echo $?
0
# curl -s -o /dev/null http://127.0.0.1/index.html
# echo $?
0
# curl -I -s -w "%{http_code}\n" -o /dev/null http://127.0.0.1/index.html
200
#根据http相应header的结果进行判断（200.301.302都表示正常）
等价于：
curl -I http://127.0.0.1/index.html 2>/dev/null|head -1|egrep "200|302|301"
# cat ifNginx.sh
#脚本1：
#!/bin/bash
echo "######http method1######"
if [ `netstat -tnlp|grep -w 80|awk -F "[ :]+" '{print $5}'` -eq 80 ]
then
echo "Nginx is Running."
else
echo "Nginx is Stopped."
/etc/init.d/nginx start
fi
#脚本2：
echo " "
echo "######http method2######"
if [ "`netstat -tnlp|grep -w 80|awk -F "[ :]+" '{print $5}'`"="80" ]
then
echo "Nginx is Running."
else
echo "Nginx is Stopped."
/etc/init.d/nginx start
fi
#脚本3：
echo " "
echo "######http method3######"
if [ `netstat -tnlp|grep nginx|wc -l`-gt 0 ]
then
echo "Nginx is Running."
else
echo "Nginx is Stopped."
/etc/init.d/nginx start
fi
#脚本4：
echo " "
echo "######http method4######"
if [ `lsof -i tcp:80|wc -l` -gt 0 ]
then
echo "Nginx is Running."
else
echo "Nginx is Stopped."
/etc/init.d/nginx start
fi
#脚本5：
echo " "
echo "######http method5######"
[ `rpm -qa nmap|wc -l` -lt 1 ] && yum -y install nmap &>/dev/null
if [ `nmap 127.0.0.1 -p 80 2>/dev/null|grep open|wc -l` -gt 0 ]
then
echo "Nginx is Running."
else
echo "Nginx is Stopped."
/etc/init.d/nginx start
fi
#脚本6：
echo " "
echo "######http method6######"
[ `rpm -qa nc|wc -l` -lt 1 ] && yum -y install nc &>/dev/null
if [ `nc -w 2 127.0.0.1 80 &>/dev/null&&echo ok|grep ok|wc -l` -gt 0 ]
then
echo "Nginx is Running."
else
echo "Nginx is Stopped."
/etc/init.d/nginx start
fi
#脚本7：
echo " "
echo "######http method7######"
if [ `ps -ef|grep -v grep|grep nginx|wc -l`-ge 1 ]
then
echo "Nginx is Running."
else
echo "Nginx is Stopped."
/etc/init.d/nginx start
fi
#脚本8：
echo " "
echo "######http method8######"
if [[ `curl -I -s -w "%{http_code}\n" -o /dev/null http://127.0.0.1/index.html` =~ 0 ]]
then
echo "Nginx is Running."
else
echo "Nginx is Stopped."
/etc/init.d/nginx start
fi
#脚本9：
echo " "
echo "######http method9######"
if [ `curl -I http://127.0.0.1/index.html 2>/dev/null|head -1|egrep "200|302|301"|wc -l` -eq 1 ]
then
echo "Nginx is Running."
else
echo "Nginx is Stopped."
/etc/init.d/nginx start
fi
#脚本10：
echo " "
echo "######http method10######"
if [ "`curl -s http://127.0.0.1/index.html`" = "ywxitest" ]
then
echo "Nginx is Running."
else
echo "Nginx is Stopped."
/etc/init.d/nginx start
fi
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