Agreed; I did not spell out all the details, silly me.

close(old)
rename(old)
open(new)

Peter

-----Original Message-----
From: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU> On Behalf Of 
Paul Gilmartin
Sent: Sunday, June 19, 2022 4:00 PM
To: IBM-MAIN@LISTSERV.UA.EDU
Subject: Re: Some UNIX file usage questions

On Sun, 19 Jun 2022 19:45:49 +0000, Farley, Peter x23353  wrote:
>    ...
>For discretely split data files (stop writing at EOD/end-of-period and start a 
>new file) using the same approach as the unix syslog demon would seem to be 
>useful.  Rename current to current-plus-timed-qualifier (date and/or time), 
>
close(); open();
Otherwise you continue writing to the renamed file.

>    ... write new with initial data, proceed as before.

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