update unset

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Xeonacid 2019-01-27 18:43:41 +08:00 committed by GitHub
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@ -492,7 +492,7 @@ $ set
...
```
使用命令 `unset` 可以清楚环境变量:
使用命令 `unset` 可以清变量:
```text
unset $变量名