"call qcmdexc parm('CLRPFM ABC' 10.00000)" in an SQL script?

I am attempting to clear several files at the top of an SQL script that
later populates those files.  (I would prefer to not use SQL's DELETE to
"clear" the file.)

I know that SQL supports calling programs with no parameters.  In a crude
test, I was able to prove that it is possible to pass parameters, as long as
they are specified in hexidecimal format, i.e., CALL ABC (x'C1').  Is there
a way to do this without mucking up the SQL script?  The SQL Reference and
Programming Guide don't offer much, although the programming guide gave an
obscure example of calling a program from a C program.

TIA,
Dan