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The file has 5000 records.
Each record has 306 chars.All records have fixed length.
At 154 th char if it is 1 it should be changed to 0. Otherwise no change.
This is the problem, Can you please...

Thanks.
But the file is big one having 5000 records. I want to change only 154 th
char where the file is having 306 chars.

I have a file like this.

1 aaa bcd 1 56 xyz 1
2 ccc rrr 1 25 512 1
1 zaz eee 1 55 511 1

I want to change middle 1's ie after bcd,rrr,eee to 0 where as other 1's
should not change....

I have a file like this.
hari,corporationbank,2234356,syndicate
ravi,indian bank,4567900000000,indianbank,accese
raju,statebank of...