if ($var{file}) #the test-file name entered by user
{
 my $fname=$var{file};
 unless ($fname) { die ("No file specified.\n"); }
 unless (-e $fname) { die ("File does not exist.\n");}
 my $line;
 open (INFO,"$fname") or die ("Cannot open .. $!\n");
 while (<INFO>)
{
  $line=<INFO>;
}  
close INFO;  
  my @new2;
  if($var{param}) { list_param($var{param}); }
  if($var{the})   { list_the($var{the}); }

sub list_param($)
{        
   if ($line =~ m:Absolute_Error_Tolerance=&quot:)
      {
          @new2=split(/\&quot;/,$line);
          $line=~s/$new2[1]/$G{param}/;
       }
}
sub list_the($)
{
      if ($line =~ m:The_Rounding_Unit=&quot:)
       {
          @new2=split(/\&quot;/,$line);
          $line=~s/$new2[1]/$G{the}/;
       }
}
my $timestamp = strftime("%m/%d/%Y_", localtime((stat($var{file}))[9]));
my $file2=$timestamp.$var{file};
rename ($var{file},$file2) or warn "***\n";
}