DD card STDENV must be a readable source. If no STDENV DD statement is defined in the JCL, CTGBATCH will still attempt to run the target program specified in the PARM string. This is acceptable if the target program is itself a self-contained executable program, for example, ctgasi.
//STDENV DD PATH='/u/ctgusr/ctgcfg/my_ctg1.env',
// PATHOPTS=(ORDONLY),PATHMODE=SIRUSR