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expand
===
将文件的制表符转换为空白字符
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## 说明
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**expand命令** 用于将文件的制表符TAB转换为空白字符space将结果显示到标准输出设备
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## 选项
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```
expand(选项)(参数)
```
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```
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-t<数字>指定制表符所代表的空白字符的个数而不使用默认的8
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```
### 参数
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文件:指定要转换制表符为空白的文件
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