Can be set on any. But, as far as I know, IBM only messed around with
/tmp.

It was IBM's way of trying to make /tmp act like library QTEMP. Lots of
poor compromises were involved.
- Anyone can see other peoples files.
- They didn't automatically clean up at job end.
- If JOBA created a duh.txt and JOBB tried also then they wouldn't be
separate files.
"Restrict rename and unlink" caused much grief when USERA would create a
file and passed if off to a process by USERB and it couldn't rename or
delete regardless of security access. This process was often done by
various email packages - IBM's included.

But, "restrict rename and unlink" was a common technique in the unix/linux
world for /tmp and IBM tried to emulate that.

Rob Berendt

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