Linux命令学习手册-head命令

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 -n smb.conf 

     1 [global] 
     2 workgroup = MY_GROUP 
     3 server string = "MySamba" 
     4 netbios name = "MySamba Server ip" 
     5 hosts allow = 127. 192.168.12. 192.168.13. 10.1.2. 
     6 security = share 
     7
     8 [public1] 
     9 path = /home/mysamba 
    10 public = yes 
    11 writable = yes 
    12
    13 [public2] 
    14 path = /root/mysamba 
    15 public = yes 
    16 writable = yes 
    17 browseable = yes 
    18 hosts allow = 10.1.2.213 10.1.2.217 
    19
    20 [public3] 
    21 path = /tmp/mysamba 
    22 public = yes 
    23 writable = yes 
    24 browseable = yes 
    25 security = user 
    26 valid users = quietheart lv-k 
    27 create mask = 0700 
    28 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 

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。