How to subtract identical lines from two text files (two columns)?

Question

Text Processing Automation

There are two columns (text files) with the names of domain names:
File A: 40,000 lines
File B: 10,000 lines
The lines from file B are in file A. You need to subtract the lines from file A that are in file B.
Tell me, with what it is can be done on windows or in google docs?

Answer 1

total commander
but easier with scripts