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 * [https://www.freedesktop.org/software/systemd/man/systemd.unit.html systemd.unit]
 * [https://www.freedesktop.org/software/systemd/man/systemd.service.html systemd.service]

 * archja:Systemd/タイマー
 * [http://qiita.com/ngyuki/items/6ba6c38baf461ba0dc01 systemd のサービスで OnFailure でメール通知 - Qiita]