rm -rf /usr/local/huanghai
rm -rf /huanghai
mkdir /huanghai -p
-- /usr/local/huanghai 为虚拟存在的目录
ln -s /huanghai /usr/local/huanghai
rm -rf /usr/local/huanghai
rm -rf /huanghai
mkdir /huanghai -p
-- /usr/local/huanghai 为虚拟存在的目录
ln -s /huanghai /usr/local/huanghai