This problem has me going around in circles. I will try to explain the problem Suppose I have 2 files A and B I search for a pattern X in file A First I want to extract the line numbers pattern X appears in file A. Now suppose pattern X appears in line numbers 4, 10, 17, 19, 24. Second step is to search for a pattern Y in file B. And then I want to replace pattern Y in file B with pattern Z on the n'th occurance This means that on the 4th, 10th, 17th, 19th and 24th occurance of pattern Y in file B I should replace pattern Y with pattern Z in file B. I hope I have been able to explain the problem properly Thanks

In reply to This has me stumped, pattern matching, 2 files by tsk1979

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