Here's a template for using Text::CSV that you can edit based on your needs (you should also install Text::CSV_XS). Note that $row is an arrayref, how to work with it is discussed in perlreftut.

#!/usr/bin/env perl
use warnings;
use strict;
use Text::CSV;

my $csv = Text::CSV->new({ binary=>1, auto_diag=>2,
    eol=>$/, always_quote=>1 });
open my $ifh, '<', 'NRoomch.txt' or die $!;
open my $ofh, '>', 'output.txt' or die $!;
while ( my $row = $csv->getline($ifh) ) {
    
    $row->[1]='P'; # your logic to modify 2nd column here
    
    $csv->print($ofh, $row);
}
$csv->eof or $csv->error_diag;
close $ifh;
close $ofh;

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In reply to Re^5: Replace value in the text file by haukex
in thread Replace value in the text file by mhoang

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