How to merge text files (several pieces)?

Question

Text Processing Automation

Windows. There is a folder, there are a lot of text files in the folder.
You need to merge several files into one.
For example, three pieces into one, then the next three pieces into one, and so on.
So that the output of 150 files is 50.

Thank you in advance for the answer that will help solve the problem =)

Answer 1

I will prompt that procedure of connection of files is called "concatenation". You write a bat script in which you get a list of files, go through it in a loop and concatenate the files by three.

Answer 2

type a*.csv b*.csv > concat-a-b.csv