http://www.turbolinux.com.cn/turbo/wiki/doku.php?do=export_xhtml&id=%E6%94%B6%E9%9B%86%E7%B3%BB%E7%BB%9F%E4%BF%A1%E6%81%AF:lsof
http://xjsunjie.blog.51cto.com/999372/1255661