Mike designed REXX as a programming language. JCL is not and was never intended to be a programming language. This is something that should be handled in the environment that creates and submits the JCL.
-- Shmuel (Seymour J.) Metz http://mason.gmu.edu/~smetz3 ________________________________________ From: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU> on behalf of Paul Gilmartin <0000000433f07816-dmarc-requ...@listserv.ua.edu> Sent: Friday, September 18, 2020 8:12 AM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: rename a dataset in acs routine? On Fri, 18 Sep 2020 17:34:17 +0800, Brian Fraser wrote: >Why can't his jobs generate dsns like HLQ.FICHE.TAPE.D091720.T1123 ? >Can use system symbols to generate the date and time in the JCL output DD. > I understand that system symbols are not supported in JCL DSNs because of o ambiguity between EXECSYS and CNVTSYS o queue latency -- the job might run at a time not matching the JCL symbols. (If the actual date and time values are important I understand they may be invalid because around midnight date and time might be fetched on different days, resulting in a 23+ hour error. Murphy says this will only be a problem when it matters. Rexx can do it right; why can't JCL?) >On Fri, 18 Sep 2020 at 15:36, Brian Westerman wrote: > ... So over time, they ended up >> with about 30,000 tapes from the over 9,000 jobs that CA-1 keeps around >> until expiration date. >> >> The problem is that they want to know if there is a way to automatically >> catalog datasets at creation time, to which I told them we could, but only >> 1 of them because you can't catalog two datasets with the same name. But >> they want to have "the system" which I'm guessing is me :), dynamically >> rename these datasets at creation time to add a date and time, such as >> change HLQ.FICHE.TAPE to which I would dynamically make it >> HLQ.FICHE.TAPE.D091720.T1123, meaning today's date and the current time (if >> it was 11:23am). >> Use the seconds also, as D200917.T112359. With thousands of entries a collision is likely. And use YYMMDD for the date for easy sorting of displays. Is it possible to rename a tape data set? That would seem to require overwriting the HDR1 label, but tapes can't be updated in place. I'm imagining a sequence such as: Momentarily catalog HLQ.FICHE.TAPE DEFINE ALIAS HLQ.FICHE.TAPE.D200917.T112359 SYMBOLICRELATE HLQ.FICHE.TAPE Uncatalog HLQ.FICHE.TAPE. I understand that symbolic aliases remain when the RELATED name is uncatalogued. -- gil ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
