the issue is as you posted the code for the previous problem in thread "giving same name to two files " . If the first time input is correct then it works fine , but if the user gives wrong file name , so I am doing this

while (!-e $filename)
     { 
          print "-*-*--*-*--*-*--*-*--*-*--*-*--*-*--*-*--*-*--*-*--*-
+*--*-*--*-*--*-*--*-*--*-*--*-*--*-*-\n";
          print STDERR "\n$filename not found. \n Ensure that you have
+ given the correct file name\n and the file exists in the working dir
+ectory \n.";
          print "Re-enter filename, or q to quit: ";
          $filename = <STDIN>;
          chomp $filename;
         # my @filenam = split ('\.', $filename);
          exit() if $filename eq "q";
     }
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