Please note that your syntax for opening files works, but is somewhat obsolete. It is better to use the three-argument syntax and to use lexical filehandles. Something like this: 
my $infile = "master.cfg";
open my $FH, "<", $infile or die "could not open $infile $!";

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You of course have to adapt other places of your code where you use the filehandles (to use $FH instead of FH).

In reply to Re^2: if value not matches replace it with other value by Laurent_R
in thread if value not matches replace it with other value by perladdicted

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