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Oh thanks a lot....this works perfectly fine & it seems fast enough to work with huge files.

Thanks a lot :b:

Hi,

I have a huge file & I want to add a specific text in column. But I want to add this text from a specific line number to a specific line number & another text in to another range of line...

Thanks a lot its working..I am grateful.

Hi I tried the above but I am getting the same out put as I was getting with grep -f

I am a new unix user & I wanted to work with unix as it is very good in text manipulations. I need a little help. I will be grateful if someone can help me out.

I need help in grepping a pattern...