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Hi rbatte1,

I tried the grep method too. It didn't work well. Thanks.

Hi vgersh99 and sea,

Thanks for your solutions.

I tried vgersh99's one line awk command. It worked great and solved my problem in seconds. Amazing:b:. Thanks again.

I have a file, named records.txt, containing large number of records, around 0.5 million records in format below:
28433005 1 1 3 2 2 2 2 2 2 2 2 2 2 2
28433004 0 2 3 2 2 2 2 2 2 1 2 2 2 2
...
...