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Linux命令总结—head命令
（1）命令功能
head命令用于显示文件的开关的内容。在默认情况下，head命令显示文件的头10行内容。
（2）命令语法
head(选项) (参数)
（3）选项说明
-n <数字>：指定显示头部内容的行数；
-c <字符数>：指定显示头部内容的字符数；
-v：总是显示文件名的头信息，显示多个文件时默认选项；
-q：不显示文件名的头信息，显示单个文件时默认选项；
（4）参数说明
文件列表：指定显示头部内容的文件列表。
（5）实例
实例1：显示单个文件的头部内容—head文件
| 1 2 3 4 5 6 7 8 9 10 11 | [root@moban ~]#head /etc/inittab # inittab is onlyused by upstart for the default runlevel. # # ADDING OTHERCONFIGURATION HERE WILL HAVE NO EFFECT ON YOUR SYSTEM. # # Systeminitialization is started by /etc/init/rcS.conf # # Individual runlevelsare started by /etc/init/rc.conf # # Ctrl-Alt-Delete ishandled by /etc/init/control-alt- delete .conf # |
实例2：显示多个文件的头部内容—head 文件 文件
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 | [root@moban ~]# head /etc/inittab /etc/fstab ==> /etc/inittab <== # inittab is only used by upstart for the defaultrunlevel. # # ADDING OTHER CONFIGURATION HERE WILL HAVE NO EFFECT ONYOUR SYSTEM. # # System initialization is started by /etc/init/rcS.conf # # Individual runlevels are started by /etc/init/rc.conf # # Ctrl-Alt-Delete is handled by/etc/init/control-alt- delete .conf # ==> /etc/fstab <== # # /etc/fstab # Created by anaconda on Mon May 11 22 : 18 : 51 2015 # # Accessible filesystems, by reference, are maintainedunder '/dev/disk' # See man pages fstab( 5 ), findfs( 8 ), mount( 8 ) and/or blkid( 8 ) for more info # UUID=17ec9366-d335-4b07- 8890 -3765cabe746a / ext4 defaults 1 1 UUID=1f8e61c7-de21-42e3-89c5-cb28f607d1db /boot ext4 defaults 1 2 |
实例3：显示文件头部指定行数的内容—head –n <行数>
| 1 2 3 4 5 6 | [root@moban ~]# head -n 5 /etc/inittab # inittab is onlyused by upstart for the default runlevel. # # ADDING OTHERCONFIGURATION HERE WILL HAVE NO EFFECT ON YOUR SYSTEM. # # Systeminitialization is started by /etc/init/rcS.conf |
实例4：显示文件头部指定字符数的内容—head –c <字符数>
| 1 2 3 4 | [root@moban ~]# head -c 88 /etc/inittab # inittab is onlyused by upstart for the default runlevel. # # ADDING OTHERCONFIGURATI[root@moban ~]# |
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