#!/bin/bash
# Ver: 1.0 by Endial Fang (endial@126.com)
# 
# shell 执行参数，分别为 -e(命令执行错误则退出脚本) -u(变量未定义则报错) -x(打印实际待执行的命令行)
set -eux
cp /etc/apt/sources/sources.list.${1:-default} /etc/apt/sources.list