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

功能

打印文件的开头部分。

形容

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 。