[1] Man page of SHUTDOWN (2015-02-06 06:34:06 +09:00 版) <http://linuxjm.osdn.jp/html/LDP_man-pages/man2/shutdown.2.html>

[2] shutdown (2011-04-26 22:57:53 +09:00 版) <http://chokuto.ifdef.jp/advanced/function/shutdown.html>