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输出文件的前面部分
```
head [options] [files]
#### 选项
-c, --bytes=[-]NUM # 打印出前NUM个字节的内容，若带前导的'-'则打印除最后NUM个字节的所有内容
-n, --lines=[-]MUM # 打印前NUM行的内容(默认前10行),若带前导的'-'则打印除最后NUM行的所有内容