You may be able to wrap your script in another script that inserts the print statements for you: 
my $script;
while (<DATA>) {
   $script .= $_;
   $script .= qq{print "line $.\\n";\n};
}

eval $script;

__END__

# your script goes here

[download]
You may be able to take this on step further and place that in a package, say, 'FollowLines', and then do something like this: 
use FollowLines;

__DATA__

# your script goes here

[download]
Be advised, though, that multi-line constructs will break this. Consider this code: 
if ($some_var == 1 ||
    $other_var == 2 ||
    $third_var)
{
    sprintf("%s %s %d %s\n",
        $some_var,
        $other_var,
        @rest);
}

[download]
A print statement every line would be a Bad Thing. I'm afraid there's not much you can do to get this functionality in a reliable fashion.

In reply to Re: (Debugging by Fastolfe
in thread (Debugging, Tracing, Trace, Instrumenting) Automatic tracing of my Perl code? by princepawn

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