compare file A from file B, and save the content in file C

while read line; do grep -q $line A.txt || echo $line; done < B.txt >C.txt

I have got the above example, its very interesting and helpful as well. If A is the file with the first content and B is the file with the second content. It prints what is not found in the second file.

 Can save output using redirection operator.

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