curl 监控web

[root@rhel6 ~]# curl -I -s -w "%{http_code}\n" -o /dev/null http://127.0.0.1

[root@rhel6 ~]# curl -I http://127.0.0.1 2>/dev/null | head -1 | egrep "200|300|301"
HTTP/1.1  OK

#!/bin/bash

if [ $# -ne  ];then
        echo $"Usage $0 url"
        exit
fi

while true;do
        res=`curl -o /dev/null --connect-timeout  -s -w "%{http_code}" $|grep -E -w "200|301|302"|wc -l`
        if [ $res -ne  ];then
                echo "$1 is down."
        else
                echo "$1 is ok."
        fi
        sleep
done

Options:

　　-I/--head          Show document info only

　　-s/--silent        Silent mode. Don't output anything

　　-w/--write-out <format> What to output after completion

　　-o/--output <file> Write output to <file> instead of stdout

　　-k/--insecure    turn off curl's verification of the certificate

　　--retry <num>   Retry request <num> times if transient problems occur

　　--connect-timeout <seconds> Maximum time allowed for connection