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# **cat**
```info
将[文件]或标准输入组合输出到标准输出
-A, --show-all 等于-vET,显示不可打印字符,行尾显示“$”
-b, --number-nonblank 对非空输出行编号
-e 等于-vE
-E, --show-ends 在每行结束处显示"$"
-n, --number 对输出的所有行编号
-s, --squeeze-blank 不输出多行空行,连续两行以上的空白行,以一行空白行代替
-t 与-vT等价
-T, --show-tabs 将跳格字符显示为^I
-u (被忽略)
-v, --show-nonprinting 使用^ 和M- 引用除了LFD和 TAB 之外
如果没有指定文件,或者文件为"-",则从标准输入读取
```
## 实例
```sh
```