/tmp on tmpfs

[Jim Meyering]

Daniel J Walsh wrote:
...
> I have been running with a tmpfs /tmp for years, without a problem.  I have
> found the having /tmp be anything else that a tmpfs has caused me pain over
> the years with mislabeled files or files with the wrong UID.
>
> Change to use a confined user or change the UID of a user suddenly X will not
> allow you to login, reboot does not fix the problem.
>
> With tmpfs I get a nice clean /tmp on every boot.

I too have been pointing TMPDIR at a tmpfs directory (per-shell-distinct, even).
The per-shell-distinct bit has exposed a few problems, where tools have
expected $TMPDIR in one shell to be the same as $TMPDIR in another one,
but nothing insurmountable.