在某台linux上并发请求链接

在一台linux机器上，需要遍历请求不同的url，需要设备请求的带宽或者请求链接数，书写shell脚本。

#!/usr/bin/bash
#-*- coding:utf-8 -*-

function proload(){
    wget -qO /tmp/url.list http://ip/ccdn_analy/url.list

    speed_per_sec=5000    #单位是KB/S
    url_list="/tmp/url.list"
    ip_list=$1
    conn_num=$((${bandlimit}*125/5))
    date_t=$(date  +%Y%m%d%H%M%S)
    cd ${dir}
    logfile="/tmp/http_url.log"
    >$logfile
    float_ip=$(ip a show lo | egrep -o "([0-9]{1,3}\.){3}[0-9]{1,3}" |  egrep -v "^10|^127|^192" | awk 'NR==2')

    if [ "$X{yewu_ip}" != "X" ];then
        cat ${url_list} | while read line
        do 
            domain=$(echo ${line} | awk 'BEGIN{FS="/"}{print $1}')
            http_line=$(echo ${line} | cut -d "/" -f 2-)
            http_url="http://"${float_ip}"/"${http_line}
            process_num=$(ps aux | grep ${domain} | grep ${float_ip} | grep -v grep | wc -l)
            if (( ${process_num} <= ${conn_num} ));then
                http_code=$(curl -I -so /dev/null -w %{http_code} ${http_url} -H "host:${domain}")
                DATE=$(date +%F-%T)
                echo "${DATE} ${http_code} ${line}" >> ${logfile}
                if [[ ${http_code} =~ 2[0-9]{2} ]];then
                    echo curl --limit-rate ${speed_per_sec}K -o /dev/null ${http_url} -H "host:${domain}"
                    nohup curl --limit-rate ${speed_per_sec}K -o /dev/null ${http_url} -H "host:${domain}" &
                fi
            fi

            sed -i "/${line}/d" ${url_list} 1>/dev/null 2>&1
            sleep 2
        done
    else
        echo -e "未获取到该主机的浮动ip"
    fi
    }

if [ $# == 0 ];then
    echo -e "\033[32m 脚本运行形势sh preload.sh 带宽值,单位是Gbps(example:sh test.sh 1)\033[0m"
else
    bandlimit=$1      #单位是Gbps
    proload bandlimit
fi