how to automatically clean /tmp

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Dear Linux Experts,

I've recently passed from Fedora 20 to Fedora 23 on my laptop.

I've a separate partition for /tmp that I'm used to see it wiped out at
any reboot on my previous installation but now this is never wiped out.

This is a real partition:

  /dev/sda10       5029504   1154204   3596772  25% /tmp

whereas previously it was a tmpfs partition. I've read on the web that
after Fedora 20 the tmpfs has been dropped in favor of real partition
but I was expecting anacron/cron entry that wipe the content of the
partition at boot but my system doesn't have any.

It is also difficult to create my own anacron/cron entry because this
should take effect before the system starts and create its temp
files/sockets in there.

I'm also puzzled because I also have a couple of tmpfs partitions:

  tmpfs            1633640         0   1633640   0% /run/user/989
  tmpfs            1633640        16   1633624   1% /run/user/526

that I don't what they are for and if I can (and how) rid of them.

Probably I could add an entry like this
  tmpfs                   /tmp            tmpfs           rw,seclabel 0 0

in /etc/fstab but this would means a waste of the space I currently have
reserved for /tmp (4Gb not much but I would prefer to use them).

So there is a way to wipe out the /tmp partition before it has been
mounted and the system creates its files and use the current partition
for it?

Thank you
Walter

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