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Thank you for the help..
Actually I have to validate a record from a file and take backup..
I am very new in unix..basically a SQL guy..
Thank you for the support

Thank you very much guys for such a guidence....
It really helped..:)
Now this is deleting all the records in range of 250 or 250 chars
sed '/^.\{4,5\}$/d' t1.vi > t7.vi
What is need is to...

Hi Friends
I have a large 35 GB file and I want to delete certein rows which are of length of 250 characters.
I am using
sed '/^{250}$/d' f1.vi > f2.vi
But it is somehow doin nothing.
Please...