最近的爬虫是在linux下运行的，使用的是云立方的代理服务器，需要自动切换一下ip。

#!/bin/bash
# coding:utf8

aa="sources.list"

#主流程
if [ -n $aa ];then
touch $aa
echo "1->ali(ubuntu16) 2->ali(ubuntu14) 3->nyist(ubuntu14)"
echo "choose :"
read sou_name #由键盘读入源类型，切换源

if [ "$sou_name" = 1 ];then
echo "${aa}文件已经创建完毕。。。开始写入${sou_name}源地址"
echo "deb http://mirrors.aliyun.com/ubuntu/ xenial main restricted universe multiverse " >> $aa
echo "deb http://mirrors.aliyun.com/ubuntu/ xenial-security main restricted universe multiverse" >> $aa
echo "deb http://mirrors.aliyun.com/ubuntu/ xenial-updates main restricted universe multiverse" >> $aa
echo "deb http://mirrors.aliyun.com/ubuntu/ xenial-backports main restricted universe multiverse" >> $aa
echo "deb http://mirrors.aliyun.com/ubuntu/ xenial-proposed main restricted universe multiverse" >> $aa

elif [ "$sou_name" = 2 ];then
echo "${aa}文件已经创建完毕。。。开始写入${sou_name}源地址"
echo "deb http://mirrors.aliyun.com/ubuntu/ trusty main restricted universe multiverse" > $aa
echo "deb http://mirrors.aliyun.com/ubuntu/ trusty-security main restricted universe multiverse" >> $aa
echo "deb http://mirrors.aliyun.com/ubuntu/ trusty-updates main restricted universe multiverse" >> $aa
echo "deb http://mirrors.aliyun.com/ubuntu/ trusty-proposed main restricted universe multiverse" >> $aa
echo "deb http://mirrors.aliyun.com/ubuntu/ trusty-backports main restricted universe multiverse" >> $aa

elif [ "$sou_name" = 3 ];then
echo "${aa}文件已经创建完毕。。。开始写入${sou_name}源地址"
echo "deb http://59.69.128.21/ubuntu/ trusty main restricted universe multiverse" > $aa
echo "deb http://59.69.128.21/ubuntu/ trusty-security main restricted universe multiverse" >> $aa
echo "deb http://59.69.128.21/ubuntu/ trusty-updates main restricted universe multiverse" >> $aa
echo "deb http://59.69.128.21/ubuntu/ trusty-proposed main restricted universe multiverse" >> $aa
echo "deb http://59.69.128.21/ubuntu/ trusty-backports main restricted universe multiverse" >> $aa
else
exit 1
fi
rm -rf /etc/apt/sources.list
mv $aa /etc/apt/
else
echo "error"
fi

#测试写入源是否成功
if test -s /etc/apt/sources.list;then
cat /etc/apt/sources.list
apt-get update

echo "Do you need to upgrade the software? y/n"
read option
if [ "$option" = 'y' ];then
apt-get upgrade -y
else
echo "not upgrade"
fi
else
echo "empty"
fi