Devel::Trace deals with line-by-line tracing :) surely you can learn something from its source 
# This is the important part.  The rest is just fluff.
sub DB::DB {
  return unless $TRACE;
  my ($p, $f, $l) = caller;
  my $code = \@{"::_<$f"};
  print STDERR ">> $f:$l: $code->[$l]";
}

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In reply to Re: Perl Debugger: Is there a variable with the current source line number being traced? by Anonymous Monk
in thread Update: homespun GUI Wrapper for the Perl Debugger with an auto-refreshing editor (BBEdit on Mac OS X) (was: Perl Debugger: Is there a variable with the current source line number being traced?) by Shoveler

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