> I tried running your script with your test example `pbind_test.sc'.
> But nothing happens, the script doesn't return an error but no output
> is printed.

It works here on GNU/Linux and

  perl 5.10.1
  socat 1.7.1.3
  sclang 3.4.5

I suppose problems with Windows but not with OSX (perhaps with pty or
the form-feed char "\f" in the sclang-code).
I repeat the steps and you can say (if you want) what it's good and what no:

1) open a terminal and run

     socat pty,link=/tmp/sclang.in,echo=0 exec:sclang

   The server is listening.

2) open another terminal and run

     ./scl_pbind2cols.pl pbind_test.sc

   Possibilities (if `socat' works):

     - you get the output
       -> yeah

     - you don't get the control of the terminal
       -> problem of the communication with sclang;
          press CTRL-C to stop the script

     - you get the control of the terminal but no output
       -> investigate

tito