Charles M wrote
<snip>
As does MODIFY, which I think of as very analogous to START, since the data
ends up in more or less the same place.
</snip>

In implementation, MODIFY is nothing like START (because of what parsing is 
done by the system of the command itself).
Each individual modify "owner" parses according to whatever rules they have 
chosen (and, one hopes, documented).

The system's parsing responsibility largely ends after determining the "name". 
The system passes whatever you typed (possibly morphed to upper-case). I'm not 
sure just when the upper-casing is done (it might even be done before anything 
even attempts to analyze what the command is).

Charles M wrote
<snip>
parameters
Program parameters passed to the started program. This might be a list in
parentheses or a string in single quotation marks.
</snip>
That is the part I'm referring to (it is under "Starting a system task from a 
console"). It is incorrect for the 4th positional parameter. It is correct for 
PARM= . We will update to make that clear. If you want my guess (without trying 
to figure out if true or not),  support for single quotation marks came later, 
was done by someone who didn't know about the 4th positional parameter who 
didn't notice in the doc update that there were two cases that this doc update 
applies to (even though the code update covered only one).

Bill G wrote
<snip>
On this page of the z/OS MVS System Commands manual, under "operands" it says 
"no embedded blanks".
It refers to commands in general, not just the "start" command.
</snip>
This shows the danger of an incomplete reference without necessary context. 
This is within a section "Typical format" and that section starts with "Most 
system commands". Yes, this is indeed the typical format. It is not the only 
format. It might be close to correct to think of this as the default format, or 
to think of it as "this, unless the specific command documents otherwise". 
There are commands which happily accept embedded blanks (typically, those do 
not require separation of parameters by a comma) and for which comments are 
delimited by /*...*/.

Peter Relson
z/OS Core Technology Design


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