How does CentOS 7 implement timing execution of python scripts

Generally speaking, under CentOS, crontab can be used to process timed tasks.

1. Installation

yum install crontabs

2. Timing syntax description

In corntab, a line of code is a timed task, and its grammatical structure can be understood through this diagram.

The meaning is as follows

* 代表取值范围内的数字
/ 代表"每"
- 代表从某个数字到某个数字
, 代表离散的取值(取值的列表)

Some commonly used time is written as follows:

* * * * * //每分钟执行
* */4 * * * //每4小时执行,每一分钟都会执行
0 */4 * * * //每4小时执行,只执行一次
0 4 * * * //每天4点执行
0 12 */2 * * //每2天执行一次，在12点0分开始运行
* * * * 0 //每周日执行
* * * * 6,0 //每周六、日执行
5 * * * * //每小时的第5分钟执行

3. Configure the script to be executed regularly

Since the python script needs to be executed regularly, the following command should be used:

python xxx.py

4. Note: Use absolute path to write the command, otherwise the timing operation will fail

5. View the list of timed tasks in the current system

crontab -l

6. Edit

crontab -e

7. Add a new record

00 * * * * /usr/bin/python3 /root/interface/blog_ETH.py

After completion, you can restart the crontab service.

service crond restart