Agi-test.agi STDERR

I’m trying to understand / debug agi-test.agi.
my cli does not display any of the print STDERR " blah blah \n";

Some research says STDERR is out put to tty9 -
how do I get to see these STDERR messages - please

got tty9 up still no STDERR out put???
however a nice work around for debugging perl code, use :

print “SEND TEXT $blah blah \n”;
you get an error message at CLI (with agi debug on) and the error message will contain the values you wanted to see.

So far the lack of feedback in this community is startling.