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翻译完毕Turn Off Bluetooth By Default In Ubuntu 14.04 [Quick Tip].md
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Turn Off Bluetooth By Default In Ubuntu 14.04 [Quick Tip]
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I recently bought a new Dell Inspiron 7437 and one of the first few things I did was to [dual boot the pre-installed Windows 8 with Ubuntu 14.04][1]. My older laptop did not have Bluetooth, strange but true. This is why I never noticed that **Bluetooth is always on at each boot in Ubuntu**.
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This is not good, from both power saving and security purpose. Moreover, I hardly use Bluetooth, so why should I have Bluetooth enabled by default? While one can turn off Bluetooth in one click in Ubuntu, doing it in each session is a repetitive and frustrating task. Simpler solution is to **deactivate Bluetooth at start up in Ubuntu**.
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In today’s quick post, I’ll share with you how to disable Bluetooth by default at each start up.
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### Turn off Bluetooth by default in Ubuntu 14.04: ###
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Open a terminal and use the following command to install [gksu][2], if you dot have it installed it already.
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sudo apt-get install gksu
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gksu is used to enter password while running a program as root. Once you have gksu installed, use the command below:
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gksudo gedit /etc/rc.local
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It will open the rc.local file. Just add the following line just before exit 0.
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rfkill block bluetooth
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Altogether, your rc.local file look like this:
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That would be it. Restart the computer and you should see that Bluetooth has been disabled. Of course you can turn it on when required by the Bluetooth indicator on the top panel.
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### Explanation: ###
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This little section is just to give a brief explanation of what we did here. It’s not obligatory to read this section. You can skip to comment section for your suggestions or thanks :)
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rc.local file is used to run various shell commands at start up time. These commands are user defined. In a clean install, rc.local has no commands to run. What we did here was to add **rfkill block bluetooth**. [rfkill][3] is a tool to query the state of various switches, buttons and subsytem interfaces. With this command in rc.localm we are basically soft blocking Bluetooth at each start up time. I hope this explains the things a bit.
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--------------------------------------------------------------------------------
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via: http://itsfoss.com/turn-off-bluetooth-by-default-in-ubuntu-14-04/
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译者：[译者ID](https://github.com/译者ID) 校对：[校对者ID](https://github.com/校对者ID)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创翻译，[Linux中国](http://linux.cn/) 荣誉推出
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[1]:http://itsfoss.com/install-ubuntu-1404-dual-boot-mode-windows-8-81-uefi/
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[2]:https://wiki.gnome.org/action/show/Apps/Attic/gksu?action=show&redirect=gksu
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[3]:http://wireless.kernel.org/en/users/Documentation/rfkill
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在Ubuntu 14.04中默认关闭蓝牙[快速秘诀]
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我最近新买了一台Dell Inspiron 7437，我第一时间做的一些事情之一就是[让预装的Windows 8和Ubuntu 14.04双启动][1]。我旧的笔记本没有蓝牙，听起来很奇怪但事实就是这样。这就是我为何从来没有注意到**蓝牙总是在Ubuntu的每次启动时自动开启**。
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从节能和安全目的来说这都不是件好事。而且，我几乎不使用蓝牙，所以我为何要让蓝牙默认启用？尽管在Ubuntu中只要一次点击就能关闭蓝牙，但每次登录都要这样重复地做一遍真是件令人泄气的任务。更简单的解决方案是**在Ubuntu启动的时候关闭蓝牙**。
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在今天的帖子中，我将与您分享如何在每次启动是默认禁用蓝牙。
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### 在Ubuntu 14.04中默认关闭蓝牙： ###
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打开一个终端并使用以下命令来安装[gksu][2]（如果你还没有安装它的话）。
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sudo apt-get install gksu
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gksu是用来在以root权限运行程序时输入密码的程序。当你已经安装了gksu之后，使用下列命令：
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gksudo gedit /etc/rc.local
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它会打开rc.local这个文件。只需在文件中的exit 0之前加入下列命令：
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rfkill block bluetooth
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就这样，你的rc.local文件看起来就像这样：
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这就是全部步骤了。重新启动电脑，您应该能够看到蓝牙已经被禁用了。当然您需要使用它的时候可以从指示器面板的蓝牙标志打开它。
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### 小说明： ###
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这一小部分只是对我们做了什么进行简短的解释。您并不一定要阅读完这一部分。您可以直接跳到评论部分留下您的建议和感谢 :)
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rc.local文件是用来记录在系统启动的时候运行的各种shell命令的。这些命令是用户定义的。在一个干净的安装中，rc.local文件中没有任何命令。我们做的就是在这里面加入命令 **rfkill block bluetooth**。[rfkill][3]是一个用来查询各种开关，按钮和底层系统接口状态的工具。我们在rc.local中使用这个命令来在每次启动的时候软关闭（译注：与其对应的是硬关闭，指通过硬件开关来关闭）蓝牙。我希望这些能把原理解释的清楚一点。
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--------------------------------------------------------------------------------
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via: http://itsfoss.com/turn-off-bluetooth-by-default-in-ubuntu-14-04/
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译者：[alim0x](https://github.com/alim0x) 校对：[校对者ID](https://github.com/校对者ID)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创翻译，[Linux中国](http://linux.cn/) 荣誉推出
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[1]:http://itsfoss.com/install-ubuntu-1404-dual-boot-mode-windows-8-81-uefi/
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[2]:https://wiki.gnome.org/action/show/Apps/Attic/gksu?action=show&redirect=gksu
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[3]:http://wireless.kernel.org/en/users/Documentation/rfkill
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