geez! Thank you! After "years" trying... I finally made it...!
thanks to your hint..
Explaining:

My f@#$@% FORM was:

<FORM METHOD="POST" ENCTYPE="multipart/formdata">
[download]

note the formdata part!

Well... Thank you cianoz!!
And thank to you all!

#!/jpsama/bin/perl -w
$tks = `mount`;
$jpsama = $! if $!;
print $jpsama;