您的位置：首页 > 运维架构 > Linux

每天一个Linux命令（15）tail命令

2016-05-13 13:43 911 查看
tail命令用于输入文件中的尾部内容。tail命令默认在屏幕上显示指定文件的末尾10行。

如果给定的文件不止一个，则在显示的每个文件前面加一个文件名标题。

[b] (1)用法:[/b]

用法: tail [必要参数] [选择参数] [文件]

如果没有指定文件或者文件名为“-”，则读取标准输入。

[b] (2)功能:[/b]

功能: 输出文件的末尾部分

[b] (3)选项参数:[/b]

1) -n <k行数> 显示文件末尾k行内容

2) -c <k字节数> 显示文件末尾k个字节数

3) -f 　　　　　　　　　　　　　　　　　 循环读取 　　　　　　　　　　　　　　

4) -q 　　　　　　　　　　　　　　　　　不显示处理信息

5) -v 　　　　　　　　　　　　　　　　　显示详细的处理信息

[b] (4)实例:[/b]

1)[root@localhost Documents]# tail -n 5 ./tail_text 查看文件后5行的内容

[root@localhost Documents]# cat tail_text
> 01 the first line!
> 02 the second line!
> 03 the third line!
> 04 the forth line!
> 05 the fifth line!
> 06 the sixth line!
> o7 the seventh line!
> 08 the eighth line!
> 09 the nineth line!
> 10 the tenth line!
> 11 the eleven line!
> 12 the twelve line!
[root@localhost Documents]# tail -n 5 ./tail_text
> 08 the eighth line!
> 09 the nineth line!
> 10 the tenth line!
> 11 the eleven line!
> 12 the twelve line!


　　 等价于tail -5 text_tail 查看后5行的内容

[root@localhost Documents]# tail -5 tail_text
> 08 the eighth line!
> 09 the nineth line!
> 10 the tenth line!
> 11 the eleven line!
> 12 the twelve line!


2)[root@localhost Documents]# tail -n +5 tail_text 从第5行开始显示

[root@localhost Documents]# tail -n +5 tail_text
> 05 the fifth line!
> 06 the sixth line!
> o7 the seventh line!
> 08 the eighth line!
> 09 the nineth line!
> 10 the tenth line!
> 11 the eleven line!
> 12 the twelve line!


3)[root@localhost Documents]# head -n -5 tail_text与[root@localhost Documents]# tail -n -5 tail_text

[root@localhost Documents]# head -n 5 tail_text　　　　　　　　　　//显示文件前5行的内容
> 01 the first line!
> 02 the second line!
> 03 the third line!
> 04 the forth line!
> 05 the fifth line!
[root@localhost Documents]# head -n -5 tail_text　　　　　　　　　　//除了文件后五行全部显示
> 01 the first line!
> 02 the second line!
> 03 the third line!
> 04 the forth line!
> 05 the fifth line!
> 06 the sixth line!
> o7 the seventh line!                                          //head命令的-n参数，当后面的整数为正为负是有区别的
[root@localhost Documents]# tail -n 5 tail_text                 //tail命令的-n参数，当后面的整数为正为负是一样的
> 08 the eighth line!
> 09 the nineth line!
> 10 the tenth line!
> 11 the eleven line!
> 12 the twelve line!
[root@localhost Documents]# tail -n -5 tail_text               //都是显示末尾的整数的绝对值行
> 08 the eighth line!
> 09 the nineth line!
> 10 the tenth line!
> 11 the eleven line!
> 12 the twelve line!


4)[root@localhost Documents]# tail -c 30 tail_text 显示末尾的字节数

[root@localhost Documents]# tail -c 30 tail_text
n line!
> 12 the twelve line!
[root@localhost Documents]# tail -c -30 tail_text
n line!
> 12 the twelve line!
[root@localhost Documents]# head -c 30 tail_text
> 01 the first line!
> 02 the [root@localhost Documents]# head -c -30 tail_text
> 01 the first line!
> 02 the second line!
> 03 the third line!
> 04 the forth line!
> 05 the fifth line!
> 06 the sixth line!
> o7 the seventh line!
> 08 the eighth line!
> 09 the nineth line!
> 10 the tenth line!
> 11 the eleve[root@localhost Documents]#


5)[root@localhost Documents]# tail -f tail_text 循环读取内容输出到标准输出

[root@localhost Documents]# tail -f tail_text                             //默认是后10行
> 03 the third line!
> 04 the forth line!
> 05 the fifth line!
> 06 the sixth line!
> o7 the seventh line!
> 08 the eighth line!
> 09 the nineth line!
> 10 the tenth line!
> 11 the eleven line!
> 12 the twelve line!
^C
[root@localhost Documents]# tail -f -n 12 tail_text                     //也可以自己指定
> 01 the first line!
> 02 the second line!
> 03 the third line!
> 04 the forth line!
> 05 the fifth line!
> 06 the sixth line!
> o7 the seventh line!
> 08 the eighth line!
> 09 the nineth line!
> 10 the tenth line!
> 11 the eleven line!
> 12 the twelve line!
^Z
[6]+  已停止               tail -f -n 12 tail_text
[root@localhost Documents]# tail -f -n 7 tail_text
> 06 the sixth line!
> o7 the seventh line!
> 08 the eighth line!
> 09 the nineth line!
> 10 the tenth line!
> 11 the eleven line!
> 12 the twelve line!


当然，也可以把信息输入到文件中:

[root@localhost Documents]# tail -f tail_text>tempory
^Z
[9]+  已停止               tail -f tail_text > tempory
[root@localhost Documents]# cat tempory
> 03 the third line!
> 04 the forth line!
> 05 the fifth line!
> 06 the sixth line!
> o7 the seventh line!
> 08 the eighth line!
> 09 the nineth line!
> 10 the tenth line!
> 11 the eleven line!
> 12 the twelve line!


6)[root@localhost Documents]# tail -n +5 tail_text与[root@localhost Documents]# tail -n 5 tail_text

[root@localhost Documents]# tail -n +5 tail_text
> 05 the fifth line!
> 06 the sixth line!
> o7 the seventh line!
> 08 the eighth line!
> 09 the nineth line!
> 10 the tenth line!
> 11 the eleven line!
> 12 the twelve line!
[root@localhost Documents]# tail -n 5 tail_text
> 08 the eighth line!
> 09 the nineth line!
> 10 the tenth line!
> 11 the eleven line!
> 12 the twelve line!
[root@localhost Documents]# head -n +5 tail_text
> 01 the first line!
> 02 the second line!
> 03 the third line!
> 04 the forth line!
> 05 the fifth line!
[root@localhost Documents]# head -n 5 tail_text
> 01 the first line!
> 02 the second line!
> 03 the third line!
> 04 the forth line!
> 05 the fifth line!


7)[root@localhost Documents]# tail -n +10 tail_text |head -n -2

[root@localhost Documents]# tail -n +10 tail_text       //从第10行显示到尾部
> 10 the tenth line!
> 11 the eleven line!
> 12 the twelve line!
[root@localhost Documents]# head -n -2 tail_text       //除了末尾两行之外前面的都显示
> 01 the first line!
> 02 the second line!
> 03 the third line!
> 04 the forth line!
> 05 the fifth line!
> 06 the sixth line!
> o7 the seventh line!
> 08 the eighth line!
> 09 the nineth line!
> 10 the tenth line!
[root@localhost Documents]# tail -n +10 tail_text |head -n -2   //综合起来，用管道命令就是后一个命令处理前面的结果，因此达到只显示第10行的效果
> 10 the tenth line!
[root@localhost Documents]#
内容来自用户分享和网络整理，不保证内容的准确性，如有侵权内容，可联系管理员处理 点击这里给我发消息
标签： 
相关文章推荐
新的分享
章节导航