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# **head**
```markdown
用法head [选项]... [文件]...
Print the first 10 lines of each FILE to standard output
With more than one FILE, precede each with a header giving the file name
With no FILE, or when FILE is -, read standard input
-c, --bytes=[-]K 打印每个文件的前K个字节以'-'开头打印每个文件中除最后K个字节以外的所有字节
-n, --lines=[-]K 打印前K行而不是前10行带前缀'-'并打印每个文件中除最后K行外的所有行
-q, --quiet, --silent 不显示包含给定文件名的文件头
-v, --verbose 总是显示包含给定文件名的文件头
K 后面可以跟乘号:
b 512, kB 1000, K 1024, MB 1000*1000, M 1024*1024,
GB 1000*1000*1000, G 1024*1024*1024, 对于T, P, E, Z, Y 同样适用
```
## 实例
```bash
head -1 file # 显示file文件第一行
head -n1 /etc/issue # 查看操作系统版本,不一定每个系统都能看到
```