【Linux】head命令

用途

它是用来显示开头或结尾某个数量的文字区块

全称

head的全称即为head

参数

-q ：隐藏文件名

-v :显示文件名

-c :<字节>显示字节数

-n :<行数>显示的行数

案例

案例一：显示文件/etc/man_db.conf 的前5行

[root@bigdata ~]# head -n 5 /etc/man_db.conf

#

#

# This file is used by the man-db package to configure the man and cat paths.

# It is also used to provide a manpath for those without one by examining

# their PATH environment variable. For details see the manpath(5) man page.

案例二：显示文件/etc/man_db.conf 除了最后5行所有的内容

[root@bigdata ~]# head -n -5 /etc/man_db.conf

#

#

# This file is used by the man-db package to configure the man and cat paths.

# It is also used to provide a manpath for those without one by examining

# their PATH environment variable. For details see the manpath(5) man page.

#

…..

案例三：显示文件/etc/man_db.conf 前100个字节

[root@bigdata ~]# head -c 100 /etc/man_db.conf

#

#

# This file is used by the man-db package to configure the man and cat paths.

案例二：显示文件/etc/man_db.conf 除了最后100个字节外所有的内容

[root@bigdata ~]# head -c -100 /etc/man_db.conf

#

#

# This file is used by the man-db package to configure the man and cat paths.

# It is also used to provide a manpath for those without one by examining

# their PATH environment variable. For details see the manpath(5) man page.

#

# Lines beginning with `#' are comments and are ignored. Any combination of

# tabs or spaces may be used as `whitespace' separators.

#

# There are three mappings allowed in this file:

……