On Tue, 17 Jan 2017 08:55:34 +0000, Mike Shorkend wrote:

>There is one case in which there might be problems. Looking at:
>
>//MYFILE DD DSN=&SYSNAME,DISP=(,PASS),UNIT=SYSDA
>
>WIth SYSSYM set to DISALLOW, this will create a valid temporary dataset(JCL
>reference says that you should use a double ampersand but a singe works
>fine).
>WIth SYSSYM set to ALLOW, this will create a dataset that is called
>whatever your SYSNAME is.
>
>Other symbols will produce other strange names
> 
... Which is good reason that reference to an undefined symbol should *always*
(yes, aboriginally) have resulted in a JCL error.

-- gil

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