每天一个linux命令：head(15)

head

head命令用于显示文件的开头的内容。在默认情况下，head命令显示文件的头10行内容。

格式

head [参数] [文件]

​

参数选项

参数	备注
-q	不显示文件名的头信息
-v	总是显示文件名的头信息
-c	<字节> 显示字节数
-n	<行数> 显示的行数

实例

• 显示文件的前n行

  命令： **head -n 5 myFile **

[root@VM_0_9_centos ~]# cat myFile
this is line 1;
this is line 2;
this is line 3;
tihs is line 4;
this is line 5;
this is line 6;
this is line 7;
this is line 8;
this is line 9;
this is line 10;
this is line 11;
this is line 12;
this is line 13;
this is line 14;
[root@VM_0_9_centos ~]# head -n 5 myFile
this is line 1;
this is line 2;
this is line 3;
tihs is line 4;
this is line 5;

• 显示文件前n个字节

  命令： **head -c 10 myFile **

[root@VM_0_9_centos ~]# head -c 10 myFile
this is li
[root@VM_0_9_centos ~]#

• 文件的除了最后n个字节以外的内容

命令： **head -c -10 myFile **

root@VM_0_9_centos ~]# head -c 10 myFile
this is li[root@VM_0_9_centos ~]# head -c -10 myFile
this is line 1;
this is line 2;
this is line 3;
tihs is line 4;
this is line 5;
this is line 6;
this is line 7;
this is line 8;
this is line 9;
this is line 10;
this is line 11;
this is line 12;
this is line 13;
this is
[root@VM_0_9_centos ~]#

• 输出文件除了最后n行的全部内容

  命令： **head -n -6 myFile **

[root@VM_0_9_centos ~]# head -n -10 myFile
this is line 1;
this is line 2;
this is line 3;
tihs is line 4;
[root@VM_0_9_centos ~]#

参考

• Linux命令大全

• github-tldr

• 每天一个linux命令：head命