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tac
===
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将文件已行为单位的反序输出
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## 说明
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**tac命令** 用于将文件已行为单位的反序输出,即第一行最后显示,最后一行先显示。
### 语法
```
tac(选项)(参数)
```
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```
-a或——append将内容追加到文件的末尾
-i或——ignore-interrupts忽略中断信号。
```
### 参数
文件列表:指定要保存内容的文件列表。