head [OPTION]... [FILE]...

功能

打印文件的开头部分。

描述

默认 head 命令打印其相应文件的开头 10 行。

举例

查看的测试文件内容

[root@lv-k samba]# cat smb.conf 
[global] 
workgroup = MY_GROUP 
server string = "MySamba" 
netbios name = "MySamba Server ip" 
hosts allow = 127. 192.168.12. 192.168.13. 10.1.2. 
security = share 

[public1] 
path = /home/mysamba 
public = yes 
writable = yes 

[public2] 
path = /root/mysamba 
public = yes 
writable = yes 
browseable = yes 
hosts allow = 10.1.2.213 10.1.2.217 

[public3] 
path = /tmp/mysamba 
public = yes 
writable = yes 
browseable = yes 
security = user 
valid users = quietheart lv-k 
create mask = 0700 
directory mask = 0700

打印文件的开始10行

[root@lv-k samba]# head smb.conf 
[global] 
workgroup = MY_GROUP 
server string = "MySamba" 
netbios name = "MySamba Server ip" 
hosts allow = 127. 192.168.12. 192.168.13. 10.1.2. 
security = share 

[public1] 
path = /home/mysamba 
public = yes

打印文件的开始12个字节

[root@lv-k samba]# head -c 12 smb.conf 
[global] 
wor

打印文件的除了最后12个字节以外的内容

[root@lv-k samba]# head -c -12 smb.conf 
[global] 
workgroup = MY_GROUP 
server string = "MySamba" 
netbios name = "MySamba Server ip" 
hosts allow = 127. 192.168.12. 192.168.13. 10.1.2. 
security = share 

[public1] 
path = /home/mysamba 
public = yes 
writable = yes 

[public2] 
path = /root/mysamba 
public = yes 
writable = yes 
browseable = yes 
hosts allow = 10.1.2.213 10.1.2.217 

[public3] 
path = /tmp/mysamba 
public = yes 
writable = yes 
browseable = yes 
security = user 
valid users = quietheart lv-k 
create mask = 0700 
directory

打印文件的头5行

[root@lv-k samba]# head -n 5 smb.conf 
[global] 
workgroup = MY_GROUP 
server string = "MySamba" 
netbios name = "MySamba Server ip" 
hosts allow = 127. 192.168.12. 192.168.13. 10.1.2.

打印除了最后20行的内容

[root@lv-k samba]# head -n -20 smb.conf 
[global] 
workgroup = MY_GROUP 
server string = "MySamba" 
netbios name = "MySamba Server ip" 
hosts allow = 127. 192.168.12. 192.168.13. 10.1.2. 
security = share 

[public1]

这里，我们可以看出来，使用 - 前缀的数字表示指明不会显示相应大小的内容。

其它

更多的信息，可以参考 info head 。