head

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".