SO loading
https://wiki.kldp.org/HOWTO/html/Program-Library-HOWTO/more-examples.html#AEN267
cURL 사용
http://www.cyberciti.biz/faq/curl-download-file-example-under-linux-unix/
Yocto
https://www.yoctoproject.org/downloads
Tree
http://www.qufe.net/xe/index.php?mid=board_TXcl73&order_type=asc&sort_index=readed_count&page=1&document_srl=726