无法理解的神奇操作
1、神奇的赋值
差不多就是一个if选择，然后赋值
svn=2
[[ $svn =~ 1 ]] && svn_path="aaaa" && package_path="bbbb"
[[ $svn =~ 2 ]] && svn_path="cccc" && package_path="dddd"
echo $svn_path
echo $package_path
2、神奇的赋值
https://github.com/cil-project/cil/blob/develop/install-sh