[ Linux ] user, password, sudoers

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1. Add Linux user,  setup password

http://linux.vbird.org/linux_basic/0410accountmanager.php

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2. sudoers

http://uiop7890.pixnet.net/blog/post/29385923-%5B%E8%BD%89%E8%B2%BC%5D-xxx-is-not-in-the-sudoers-file%E8%A7%A3%E5%86%B3%E6%96%B9%E6%B3%95