（转，有改动）测试网页响应时间的shell脚本[需要curl支持]

用法及返回结果如下：

[root@myserver01 tmp]# sh test_web.sh -n500 http://www.baidu.com
Request url: http://www.baidu.com
Request number:
Request Failed:
------Average Value------
time_connect: 0.014414
time_namelookup: 0.010926
time_total: 0.020486
-------------------------

请求参数：
-n 指定发送多少次请求，默认为10

返回结果为 curl -w 选项返回值，以下摘自curl官方文档（http://curl.haxx.se/docs/manpage.html）：

time_connect ：连接时间,从开始到建立TCP连接完成所用时间,包括前边DNS解析时间，如果需要单纯的得到连接时间，用这个time_connect时间减去前边time_namelookup时间。(The time, in seconds, it took from the start until the TCP connect to the remote host (or proxy) was completed.)

time_namelookup： DNS解析时间,从请求开始到DNS解析完毕所用时间。(The time, in seconds, it took from the start until the name resolving was completed.)

time_total： 总时间，按秒计。精确到小数点后三位。 （The total time, in seconds, that the full operation lasted. The time will be displayed with millisecond resolution.）

代码如下（可自行添加其他功能）：

#!/bin/bash
#requesturl.sh

usage="
Usage: $ [options...] <url>\n
Options:\n
 -h This help text\n
 -n <num> The numbers to request\n
"
if [ $# -lt  ]
then
    echo -e $usage
    exit
fi
num=
while getopts "n:h" arg
do
    case $arg in
        n)
            num=$OPTARG
            if [ $num -lt  ]
            then
                num=
            fi
            ;;
        h)
            echo -e $usage
            exit
            ;;
        ?)
            echo "Unknow argument"
            exit
            ;;
        esac
done

url=$(eval echo "\$$#")

if [ "http://" != ${url::} ]
then
    echo "The url need to add the http:// prefix"
    exit
fi

echo "Request url: "$url
echo "Request number: "$num

i=
while [ $i -le $num ]
do
    c=`curl -o /dev/null -s -w \
        "http_code:%{http_code} time_namelookup:%{time_namelookup} \
        time_connect:%{time_connect} time_total:%{time_total}" $url`
    s=$s$c"\n"
    i=$[$i+]
done
#echo -e $s
echo -e $s | \
awk '{OFS="\n"}{if($1) for(i=1;i<=NF;i++)print $i}' | \
awk -F: -v num=$num -v failnum= \
    '{if($1 != "http_code")result[$1]+=$2;if($1=="http_code" && $2 != 200)failnum++} \
    END{print "Request Failed: " failnum "\n------Average Value------"; \
    for(i in result) {print i ": " result[i]/num;} \
    print "-------------------------"}'

（转自：http://renxiangzyq.iteye.com/blog/782773）