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docs/help.md

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+---
+hide:
+  - navigation
+---
+
+## 关于报错 Command not found
+
+  - 如果提示 `Command 'curl' not found` 则说明当前未安装 `curl` 软件包
+
+    ``` sh
+    yum install -y curl || apt-get install -y curl
+    ```
+
+## 还原已备份的软件源
+
+  - Debian 系
+
+    ``` sh
+    cp -rvf /etc/apt/sources.list.bak /etc/apt/sources.list
+    ```
+
+  - RedHat 系 / openEuler
+
+    ``` sh
+    cp -rvf /etc/yum.repos.d.bak /etc/yum.repos.d
+    ```
+
+  - openSUSE
+
+    ``` sh
+    cp -rvf /etc/zypp/repos.d.bak /etc/zypp/repos.d
+    ```
+
+## 其它
+
+  - 如果提示 `bash: /proc/self/fd/11: No such file or directory`，请切换至 `Root` 用户执行