assuming you are familiar with the use of regular expressions (see 'perldoc perlre' if not), what you want is to perform a substitution using regular expression on this record.

to do it on a text file - I recommend tie'ing the file to an array and perform the substitution on the array. take a look at Tie::File.

example: 

use Tie::File;

tie @array, 'Tie::File', 'test';

foreach (@array){
        s/RECORD/NEW RECORD/g;
}

untie @array;

[download]

Enjoy,
Mickey

In reply to Re: how to update a field of a record in a large text file by mickeyn
in thread how to update a field of a record in a large text file by sandeep

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