sub changeData{
        my ($self) = @_;

        `$toolPath/an2k2txt ./Templates/DFP.nst ./tmp/Data2`;

        open my $handle, "<", "./Data2";

        my $file = new IO::File("./$self->{_nistName}.tmp","w");

        my $data;

        while(<$handle>){
                if ($_ =~ m/$self->{_field}/i){
                        chomp($_);
                        $_ =~ s/=.*//;
                        #Seems that \x1F\x0A is the delimiter at the end of the lines
                        $data = $_."=".$self->{_newValue}."\x1F\x0A";
                        print $file $data;
                }
                else{
                        print $file $_;
                }
                print "$_\n";
        }
        close $handle;
        `$toolPath/txt2an2k ./$self->{_nistName}.tmp ./Nist/$self->{_nistName}.bad`;

        system("rm -f ./*.tmp");
}