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Merge pull request #669 from litzhou/patch-1

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Update 后端程序员必备的Linux基础知识.md
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docs/operating-system/后端程序员必备的Linux基础知识.md
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@ -280,6 +280,8 @@ Linux中的打包文件一般是以.tar结尾的，压缩的命令一般是以.g
**`chmod u=rwx,g=rw,o=r aaa.txt`** **`chmod u=rwx,g=rw,o=r aaa.txt`**
**`chmod -R u=rwx,g=rwx,o=rwx ./log`** // 递归给log目录下的所有文件授权
![](https://user-gold-cdn.xitu.io/2018/7/5/164697447dc6ecac?w=525&h=246&f=png&s=12362) ![](https://user-gold-cdn.xitu.io/2018/7/5/164697447dc6ecac?w=525&h=246&f=png&s=12362)
上述示例还可以使用数字表示： 上述示例还可以使用数字表示：