How to find delta between two text files?

Question

Journaling

There are two text files. Several hundred MB in size. You need to make a delta - that is, output the third file, which would indicate which lines from the first file are missing in the second.
I tried grep.exe -f file1.txt file2.txt
Swears: grep.exe: memory exhausted: Not enough space
WinMerge for some reason does not show a match. Maybe because they are all on different lines.
What are the options for solving the problem? Windows OS.

Answer 1

try diff from gow .