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unexpand
===
将文件的空白字符转换为制表符
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## 说明
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**unexpand命令** 用于将给定文件中的空白字符space转换为制表符TAB并把转换结果显示在标准输出设备显示终端
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## 选项
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```
unexpand(选项)(参数)
```
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```
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-a或--all转换文件中所有的空白字符
--first-only仅转换开头的空白字符
-t<N>指定TAB所代表的N个N为整数字符数默认N值是8
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```
### 参数
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文件指定要转换空白为TAB的文件列表
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