Not a good idea. In your version FILE2 is reread many times from disk even though file2 is already available in @file2. But worse, FILE3 will be written as many times as file1 has lines and only the last version will survive.

In reply to Re^2: Read strings from a file, search and replace same string in another file. by jethro
in thread Read strings from a file, search and replace same string in another file. by premal

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