Two suggestions, both involving using a temp file:
 
(a) use echo *JOB user.acct;outclass=,,1 >> jobfile
        echo *file somefile=thatfile.pub >> jobfile
        (etc)
        echo *EOJ >> jobfile
        stream jobfile,*
 
(b) If you need to do "in-line" variable substitutions the above may work
    best for you, but there are a few "shortcuts" to avoid all the 'echo's:
 
    1. Be sure your command file ends with a 'return', then append any other
       fixed JCL to the end.  You can then FCOPY...;SUBSET= to select them.
    2. Build a short stream file which just invokes the command file in
       batch.  You can then do your "tricks" by checking if you're in session
       or batch and act accordingly.
 
[\] Jeff Kell, [log in to unmask]