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# sum
## 说明
**sum命令** 用于计算并显示指定文件的校验和与文件所占用的磁盘块数
## 选项
```markdown
-r：使用BSD的校验和算法，块大小为1k
-s：使用system V的校验和算法，块大小为512字节
```
## 实例
```bash
sum insert.sql # 计算文件校验码
