the file in the path /tmp is lost
 

I found that in my rh system , the file in the path /tmp seems have been removed in a certain interval of time ( eg. two weeks ) , so always can't find the file that over 2 weeks , I have checked no cron job will remove the file , could suggest how can I check the reason , is it because any function / service has been enabled ? thx

Have you rebooted in that time? Some distros nuke /tmp on reboot but not while the system is running. Otherwise check root's crontab and the /etc/crontab file (as well as cron.daily, cron.weekly, etc.) for the offender. There's a program called tmpwatch that does this sort of thing.

thx reply , i found a tmpwatch as below , but is not added to the crontab ( I can't see it by crontab -e ) , is the below job run as schedule ? is it the reason why my file in /tmp is lost ? please advise

ll /etc/cron.daily/tmpwatch

/usr/sbin/tmpwatch 240 /tmp
/usr/sbin/tmpwatch 720 /var/tmp
for d in /var/{cache/man,catman}/{cat?,X11R6/cat?,local/cat?}; do
if [ -d "$d" ]; then
/usr/sbin/tmpwatch -f 720 $d
fi
done