Linux schedules automatic deletion of files in a directory at regular intervals

To achieve scheduled deletion of all files in a certain directory, you need to use the Linux crontab command, which can be achieved with a shell script. For example, to delete all cache files under /tmp, do the following:

[root@localhost ~]# vi /etc/init.d/delete.sh

按i并复制下面内容到delete.sh文件内，之后按shift+: 输入wq保存并退出。

#!/bin/bash
dir=/tmp //需要清空的目录名称
files=`ls ${dir}`
for file in $files
do
if [ -e ${dir}/${file} ];then
rm -f ${dir}/${file}
fi
done

Then give this script 755 permissions, the code is as follows:

[root@localhost ~]# chmod 755 /etc/init.d/delete.sh

Next, use the crontab command to set the time. For example, clear all files in the /tmp directory at 3 a.m. every day. Running the following command will enter the vim editing interface.

[root@localhost ~]# crontab –e

粘贴以下代码;

0 3 * * * /etc/init.d/delete.sh

保存并退出，现在定时工作已经完成了，每天凌晨3点自动清空/tmp目录下的文件。

crontab –e的时间用法说明；

* * * * * /etc/init.d/delete.sh

分 时 日 月 周 命令
第1列*号表示分钟1-59 每分钟用*或者 */1表示
第2列*号表示小时0-23小时（0表示0点）
第3列*号表示日期1-31日
第4列*号表示月份1-12月
第5列*号表示每周，0-6（0表示星期天）
第6列是要运行的命令

例如每周3的晚上23:30运行该脚本，可以这样写：

30 23 * * 3 /etc/init.d/delete.sh

The same is true for other time periods.

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