# xxd 工具

`xxd` 命令对于标准输入或者给定的文件，显示其16进制的内容。也可以反过来进行转换。

## 命令用法

```
$ xxd [options] [infile [outfile]]
```

其中，

* infile 表示要输入进行 16 进制编码的文件
* outfile 表示转换结果的输出文件

## 常用可选参数

| 参数              | 说明                                 |
| --------------- | ---------------------------------- |
| -b              | 用二进制现实一个 bit，而不是使用十六进制             |
| -r              | 以十六进制作为输入，二进制作为输出                  |
| -l NUM          | 只输出 `NUM` 个字符                      |
| -u              | 十六进制输出时使用大写字母，默认时小写字母              |
| -i              | 以 C 语言 include 文件的形式输出             |
| -h              | 输出概要信息                             |
| -r -s offset    | 调整当前位置的偏移位置 `offset`               |
| -s \[+]\[-]seek | 调整开始位置的偏移位置 `seek`，+ 为绝对偏移，- 为相对偏移 |

## 使用实例

1. 显示十六进制格式

   ```bash
    gackle@machine:~$ echo 1111111 > 1.txt

    gackle@machine:~$ cat 1.txt
    1111111

    gackle@machine:~$ xxd 1.txt
    00000000: 3131 3131 3131 310a                      1111111.
   ```
2. 转换为二进制形式显示

   ```bash
    gackle@machine:~$ xxd 1.txt |xxd -r
    1111111
   ```


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