I'm new to perl I could not fing the problem inthis code test.cfg 
newyork 1536000 13 56
california 1536000 67 45
London 456
newyork 1536000 78 87

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open FILE, "+< test.cfg" || die "Cannot open file\n" ;
while ($line = <FILE>) {
  if ($line =~ /newyork/ ) {
              $line =~ s/1536000/7878787878/;
              print " the line is $line";

   }
}
close FILE;

[download]
when i print the line the value is changed but when i vi the file it still has the old value..any help of what's going wrong ..

In reply to reg perl substitution by pret_23_1

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