Regular expression gadget series

Regular expression gadget series

One 、cut Column interceptor

Specify the interception column and awk almost , But it can be more accurate

Options	explain
-b	Intercept by byte
-c	Intercept by character , Commonly used in Chinese
-d	Specify what is the delimiter to intercept , Default tab
-f	Usually and -d Together

example ：

experiment -c When I was too lazy to type, I wrote a name generator （ I mean, I wrapped this bowl of dumplings for this dish of vinegar ）

Two 、sort Sorting tools

You can sort the contents of the file , You can also sort according to different data types （ In Chinese, follow the English alphabetic order of Pinyin ）

Options	explain
-t	Specify the separator
-k	Specify sorting area , That interval sort
-n	Sort by number , Default text form sorting
-u	Only one row of the same data is displayed
-r	Descending , The default sort is ascending
-o	Transfer the sorting structure to the specified file and > equally

[ Failed to transfer the external chain picture , The origin station may have anti-theft chain mechanism , It is suggested to save the pictures and upload them directly (img-13xwRvqJ-1657783119834)(C:\Users\Mogu\AppData\Roaming\Typora\typora-user-images\image-20220707140017862.png)]

3、 ... and 、uniq duplicate removal

Options	effect
-c	Count duplicate lines
-d	Show only duplicate lines
-u	Show only rows that appear once

example [ Failed to transfer the external chain picture , The origin station may have anti-theft chain mechanism , It is suggested to save the pictures and upload them directly (img-KC3rT58j-1657783119835)(C:\Users\Mogu\AppData\Roaming\Typora\typora-user-images\image-20220707140841541.png)]

Four 、tr Replace

Options	explain
-d	Delete character
-s	Delete all duplicate characters , And only keep the first

[ Failed to transfer the external chain picture , The origin station may have anti-theft chain mechanism , It is suggested to save the pictures and upload them directly (img-LEtGtT4b-1657783119836)(C:\Users\Mogu\AppData\Roaming\Typora\typora-user-images\image-20220707144812435.png)]

[ Failed to transfer the external chain picture , The origin station may have anti-theft chain mechanism , It is suggested to save the pictures and upload them directly (img-14TTXFEK-1657783119836)(C:\Users\Mogu\AppData\Roaming\Typora\typora-user-images\image-20220707144904805.png)]

[ Failed to transfer the external chain picture , The origin station may have anti-theft chain mechanism , It is suggested to save the pictures and upload them directly (img-U5UZFgZa-1657783119837)(C:\Users\Mogu\AppData\Roaming\Typora\typora-user-images\image-20220707145126615.png)]

[ Failed to transfer the external chain picture , The origin station may have anti-theft chain mechanism , It is suggested to save the pictures and upload them directly (img-Wk5o5usg-1657783119838)(C:\Users\Mogu\AppData\Roaming\Typora\typora-user-images\image-20220707145351255.png)]

[ Failed to transfer the external chain picture , The origin station may have anti-theft chain mechanism , It is suggested to save the pictures and upload them directly (img-d4VM5g9d-1657783119838)(C:\Users\Mogu\AppData\Roaming\Typora\typora-user-images\image-20220707145543927.png)]

5、 ... and 、 Mixed topic

​ 1. Count the current number of host connections

 Counting the number of connections is mainly about tcp Of ip extracted , All use netstat -natp

[ Failed to transfer the external chain picture , The origin station may have anti-theft chain mechanism , It is suggested to save the pictures and upload them directly (img-VE1jhKZd-1657783119839)(C:\Users\Mogu\AppData\Roaming\Typora\typora-user-images\image-20220707153551425.png)]

 I want to ip If that column is extracted, it is generally used cut, But there are too many spaces , Use cut Cannot define interval , So we need to add extra " " Replace with tr-s // Remove duplicate characters 

[ Failed to transfer the external chain picture , The origin station may have anti-theft chain mechanism , It is suggested to save the pictures and upload them directly (img-kvYNOYg1-1657783119839)(C:\Users\Mogu\AppData\Roaming\Typora\typora-user-images\image-20220707155124337.png)]

 Intercepted , It turns out that there are several IPV6 Of IP It's not what we need , We can limit the format 255.255.255.255, This will filter out clean ip Address 

[ Failed to transfer the external chain picture , The origin station may have anti-theft chain mechanism , It is suggested to save the pictures and upload them directly (img-Sc8ZDfWQ-1657783119840)(C:\Users\Mogu\AppData\Roaming\Typora\typora-user-images\image-20220707155710971.png)]

 As a result, something speechless happened , Followed by the port number , We also need cut-d Exclude port numbers 

[ Failed to transfer the external chain picture , The origin station may have anti-theft chain mechanism , It is suggested to save the pictures and upload them directly (img-JnHRAqLk-1657783119840)(C:\Users\Mogu\AppData\Roaming\Typora\typora-user-images\image-20220707155858321.png)]

 Then sort first and then count , because uniq It's a fool , Only continuous 

d Exclude port numbers

[ Outside the chain picture transfer in ...(img-JnHRAqLk-1657783119840)]

Then sort first and then count , because uniq It's a fool , Only continuous

[ Failed to transfer the external chain picture , The origin station may have anti-theft chain mechanism , It is suggested to save the pictures and upload them directly (img-U7FLv6kP-1657783119841)(C:\Users\Mogu\AppData\Roaming\Typora\typora-user-images\image-20220707160108048.png)]