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I have a new issue actually,
So what I want to do is compare two files such as:

file1.txt
A B C D E F G
X 34234 324234
A B C D E F Z
A B C D E F Z
X 34234 0
...
file2.txt
A B C D E F Z
X...

hmm I see, but it still will go through the whole file, which is like a 1GB text file...
thanks though

---------- Post updated at 04:15 AM ---------- Previous update was at 04:14 AM ----------
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Hi!
I'd like to know if it is possible for a command to find the first difference between two large files, output that line from both file and stop, so no need to continue after that to save some...