If your program requires input, for example, print "How much would you like to invest in Microsoft? \n" $invest = <STDIN>; chomp $invest; $losses = $invest; print "You will lose $losses \n"; and I run perldebug, using s to step through the lines, when I get to the second line, I will need to input something. When running the debugger, though, it just steps through this line and $invest remains undefined. How do I get the debugger to let me input the values where the program needs them? Thanks in advance, Jim