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expand
===
将文件的制表符转换为空白字符
## 说明
**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
## 选项
```
expand(选项)(参数)
-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
### 参数
文件：指定要转换制表符为空白的文件
