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#### 简介
很多UNIX文档里，都有RLF控制字符。当把这些控制字符重定向到文件里的时候就会变成乱码，col指令可以有效过滤这些控制字符。
col工具从标准输入读取，将结果写入标准输出。
#### 语法
```
col [options]
#### 选项
-b, --no-backspaces # 不输出backspaces
-f
-p
-h
-x
-l