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Thank you very much reborg. I wonder if we can do this by using awk...I don't know really.

No I am running this under sh . I will try this out with ksh..thanks for your help...still suggest me the better way to do this if you think any...truly thanks in advance.

It's not working....it's deleting the whole file..

Actually I have 8GB file which contains 200,000 records and I want to delete first 50,000 records without opening the file. At the same time I don't want to create another file once I delete the...

How I can delete 100 lines anywhere in a file without opening a file and without renaming the file.