How to CLRPFM in CGI program?

["Greg Weber" <gweber@xxxxxxxxxxxx>]

I need to clear a physical file at a certain point in an RPGLE program
that uses CGIDEV2 and I'm having a tough time getting it to work.
Here's the code I've tried (all free format):

syscall('clrpfm gregw/fndordbydt');
and
syscall('clrpfm file(gregw/fndordbydt)');

Then a co-developer theorized that perhaps you can't use the clrpfm
command from inside a CGI job, so I wrote a batch program that does it
and called it from a command line.  It works great.  Then I tried to
call THAT program from within my CGI program, but no joy.  Here's what I
tried (the batch program has the same name as the file it's clearing):

syscall('call gregw/fndordbydt');
and
syscall('call pgm(gregw/fndordbydt)');

Then I tried it this way, and it STILL wouldn't work:

syscall('sbmjob cmd(call pgm(gregw/fndordbydt)');
and
Cmd = 'sbmjob cmd(call pgm(gregw/fndordbydt) parm(''' +
      '''))';
syscall(%trim(Cmd));

There are no parameters to pass, so I left the "parm" off and then tried
it with "parm" blank.  The CGI program doesn't fail, and there are no
compile errors, but both the clrpfm and the call pgm commands simply
don't do anything, no matter where I do the syscall within the program.
What's wrong?  Thanks.