在Linux系统中/tmp文件夹下的文件是会被清理、删除的，文件清理的规则是如何设定的呢？ 以Redhat为例，这个主要是因为作业里面会调用tmpwatch命令删除那些一段时间没有访问的文件。
那么什么是tmpwatch呢？其实tmpwatch是一个命令或者说是一个包。如下所示
tmpwatch - removes files which haven’t been accessed for a period of time
[root@DB-Server ~]# rpm -qa | grep tmpwatch
tmpwatch-2.9.7-1.1.el5.5
[root@DB-Server ~]# whereis tmpwatch
tmpwatch: /usr/sbin/tmpwatch /usr/share/man/man8/tmpwatch.8.gz
[root@DB-Server ~]# file /usr/sbin/tmpwatch
/usr/sbin/tmpwatch: ELF 64-bit LSB executable, AMD x86-64, version 1 (SYSV), for GNU/Linux 2.6.9, dynamically linked (uses shared libs), for GNU/Linux 2.6.9, stripped
[root@DB-Server ~]#