Linux under TMP directory delete rule

We know that in the Linux system in the/TMP folder inside the file will be emptied, as to how long to be emptied, how to empty, may not have a lot of knowledge, so, today we will analyze one of these two problems.

In the rhel\centos\fedora\ system (This experiment was conducted in RHEL6)

Take a look at Tmpwatch this command, his role is to delete files that are not used for a period of time (removes files which haven ' t been accessed for a period of the times). The specific usage is not much to say, interested in self-study. We mainly look at the scheduled task files associated with this command.

He's/etc/cron.daily/tmpwatch, and we can look at the contents of this file.

#! /bin/shflags=-umc/usr/sbin/tmpwatch  "$flags"  -x /tmp/. x11-unix -x /tmp/. xim-unix         -x /tmp/.font-unix -x /tmp/. ice-unix -x /tmp/. test-unix         -x  '/tmp/hsperfdata_* '  10d /tmp/ usr/sbin/tmpwatch  "$flags"  30d /var/tmpfor d in /var/{cache/man,catman}/{cat? X11r6/cat?,local/cat?};  do    if [ -d  "$d"  ]; then         /usr/sbin/tmpwatch  "$flags"  -f 30d  "$d"     fidone 

This script is carefully analyzed to understand that the first line is equivalent to a tag (parameter), the second line is for the/tmp directory in the excluded directory, the third row, this is the/tmp directory cleanup, the following is for the other directory cleanup, do not say.

We just came to see/usr/sbin/tmpwatch "$flags" 30d/var/tmp this line, the key is this 30d, is 30 days meaning, this decided 30 days to clean up the files not accessed by/TMP. If you want to clean up a day, change the 30d to 1d. This you know ... Ha ha!

But there is a problem to note, if you set a shorter time to clean up, say 30 minutes, 10 seconds and so on, you can set in this file, but you will find that re-computer, he does not clean the contents of the/tmp folder, this is why? This is tmpwatch his location, his upper-level directory is/etc/cron.daily/, and this directory is the day to perform a scheduled task, so that you set a shorter time than the day, he will not work. That's clear.

So the conclusion is: in RHEL6, the default time limit for the system to automatically clean the/tmp folder is 30 days.

Reprint: http://www.cnblogs.com/hnrainll/archive/2011/06/08/2074976.html

This article is from the "Potato" blog, please be sure to keep this source http://zhaoyulin.blog.51cto.com/11665101/1882029

Linux under TMP directory delete rule