下载plowshare：
git clone https://code.google.com/p/plowshare/
安装：
PREFIX=/usr/local/plowshare make install
执行链接：
ln -s /usr/local/plowshare/bin/plowdown /usr/bin/plowdown ln -s /usr/local/plowshare/bin/plowup /usr/bin/plowup ln -s /usr/local/plowshare/bi......