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Update ch03-ssh.md #99

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1. 正如你的手机，无论安卓还是iPhone，为了APP及时更新（获取安全补丁和新功能），都会时不时从应用商店获得更新信息，并且提示你有多少个APP可更新。Linux系统也有逻辑十分类似的更新机制。所以只要你会更新手机APP，就能学会更新Linux软件！

2. Linux下，每个APP都叫做一个“包” （package）。管理APP的程序自然就叫做“包管理器”（Package Manager）。你可以通过它安装、更新、卸载各种软件、甚至更新Linux系统本身。Linux下的包管理器非常强大，此处按下不表，现在你只需要知道Debian系统的包管理器叫做 `apt` 即可。接下来，我们就先使用 `apt` 做一次软件的全面更新，让你熟悉它的基本操作。
2. Linux下，每个APP都叫做一个“包” （package）。管理APP的程序自然就叫做“包管理器”（Package Manager）。你可以通过它安装、更新、卸载各种软件、甚至更新Linux系统本身。Linux下的包管理器非常强大，此处按下部表，现在你只需要知道Debian系统的包管理器叫做 `apt` 即可。接下来，我们就先使用 `apt` 做一次软件的全面更新，让你熟悉它的基本操作。

3. 小小白白Linux基础命令：

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