You will read FILE01. The DUMMY forces EOF at that point.
Christopher Y. Blaicher Senior Software Developer Austin Development Lab phone: 512.340.6154 mobile: 512.627.3803 fax: 512.340.6647 10431 Morado Circle Austin, TX 78759 -----Original Message----- From: IBM Mainframe Discussion List [mailto:IBM-MAIN@bama.ua.edu] On Behalf Of Quasar Chunawalla Sent: Tuesday, March 08, 2011 8:45 AM To: IBM-MAIN@bama.ua.edu Subject: Re: QSAM concatenation where the first DD is DUMMY? Well, what if I code this - //DDO1 DD DSN=FILE01,DISP=SHR // DD DUMMY // DD DSN=FILE03,DISP=SHR Does the whole thing get dummied out like before? Thank you very much, Quasar chunawalla Sent on my BlackBerry® from Vodafone -----Original Message----- From: J R <jayare...@hotmail.com> Sender: IBM Mainframe Discussion List <IBM-MAIN@bama.ua.edu> Date: Tue, 8 Mar 2011 09:35:38 To: <IBM-MAIN@bama.ua.edu> Reply-To: IBM Mainframe Discussion List <IBM-MAIN@bama.ua.edu> Subject: Re: QSAM concatenation where the first DD is DUMMY? You could maybe set up a single empty dataset, say, SYS1.NULLFILE or SYS1.DUMMY, that could be used by any job, and refer its DCB to the original dataset that you are nullifying. For example: // DD DSN=ORIGINAL.FILE,DISP=SHR becomes // DD DSN=SYS1.NULLFILE,DCB=ORIGINAL.FILE,DISP=SHR so you just have to insert "SYS1.NULLFILE,DCB=" after "DSN=". > Date: Tue, 8 Mar 2011 06:42:20 -0700 > From: st...@trainersfriend.com > Subject: Re: QSAM concatenation where the first DD is DUMMY? > To: IBM-MAIN@bama.ua.edu > > On 3/7/2011 10:36 PM, ನಾಗೇಶ್ ಸುಬ್ರಹ್ಮಣ್ಯ (Nagesh S) wrote: > > Would the effect be the same with DSN=NULLFILE ? > > Yes. > > I wish I could test; but, I > > do not have access to a z system these days. The manuals seem to convey > > NULLFILE and DUMMY do not differ. > > > > Of course, one can actually allocate an empty dataset in ISPF 3.2 and then > > provide this name in the override. ;-) > > Well, you can also allocate an empty dataset in a prior > job step, no need to use ISPF. But, unless you are using > SMS for this allocation, the file will not have an end > of data indicator, so in the step where you try to > reference this empty file for input, it will likely fail > with an abend. > > So, it's a little more complicated. Of course you could > create an empty file, edit it, including deleting all > the lines, then exit. Then use that file in multiple > jobs that use input files with the same DCB attributes. > > > > <snippage> > > -- > > Kind regards, > > -Steve Comstock > The Trainer's Friend, Inc. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
