Well there you go:

//MASK EXEC PGM=IEFBR14                 
//STEPLIB   DD DISP=SHR,DSN=some.dataset.name

Looked before, DOLR was 8/1; repeated to be sure looking at DOLR didn't change 
DOLR (which would be Bad, but); ran job; now DOLR is 8/5.

Now, OP had something about "the files are large" but if anyone explained why 
that mattered for this, I missed it. Does it?

-----Original Message-----
From: IBM Mainframe Discussion List <[email protected]> On Behalf Of 
Seymour J Metz
Sent: Monday, August 5, 2024 3:46 PM
To: [email protected]
Subject: Re: How to "touch" mainframe files

An authorized application can directly update the VTOC, but an unauthorized 
application needs the allocation and OPEN. Neither the C/I nor the Initiator 
will open the dataset unless it is, e.g., STEPLIB.

--
Shmuel (Seymour J.) Metz
http://mason.gmu.edu/~smetz3
עַם יִשְׂרָאֵל חַי
נֵ֣צַח יִשְׂרָאֵ֔ל לֹ֥א יְשַׁקֵּ֖ר



________________________________________
From: IBM Mainframe Discussion List <[email protected]> on behalf of 
Itschak Mugzach <[email protected]>
Sent: Monday, August 5, 2024 2:54 PM
To: [email protected]
Subject: Re: How to "touch" mainframe files

I thought the op requires no allocation, no IO. VTOC alteration is the only 
way, I assume.

ITschak

*| **Itschak Mugzach | Director | SecuriTeam Software **|** IronSphere
Platform* *|* *Information Security Continuous Monitoring for Z/OS, zLinux and 
IBM I **|  *

*|* *Email**: [email protected] **|* *Mob**: +972 522 986404 **|*
*Skype**: ItschakMugzach **|* *Web**: http://www.securiteam.co.il/  **|*





On Mon, Aug 5, 2024 at 9:02 PM Seymour J Metz <[email protected]> wrote:

> No, you need an OPEN.
>
> --
> Shmuel (Seymour J.) Metz
> http://mason.gmu.edu/~smetz3
> עַם יִשְׂרָאֵל חַי
> נֵ֣צַח יִשְׂרָאֵ֔ל לֹ֥א יְשַׁקֵּ֖ר
>
>
>
> ________________________________________
> From: IBM Mainframe Discussion List <[email protected]> on 
> behalf of Toby Seguin <[email protected]>
> Sent: Monday, August 5, 2024 1:53 PM
> To: [email protected]
> Subject: Re: How to "touch" mainframe files
>
> I used to run IEFBR14 with a disp of shr,keep,keep to touch a dataset. 
> It keeps it from going to archive without opening it. Not sure if it 
> updates the last used date or not. I'd assume it would.
>
> Andrew Huntington
> Project Coordinator
> SECURITY ARCHITECTURE
>
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