This site is being upgraded and iterated. Since the me domain name cannot be filed, a new site has been launched: Learn2.cn The function and content are more powerful. Please correct me if there are any mistakes.

I made a crawler to grab data earlier, but it is impossible for me to trigger it every time I get data, so I need to set the script to run automatically and get data every half an hour.

The famous crontab is going to be used here.

# Instructions

If you execute the script as the current user, just enter:

crontab -e

After you press Enter, you will be asked to choose an editor, just choose your favorite one, and it will enter a file, which will contain some codes like this:

*/2  * python /data5/crontest.py >> /data5/crontest.py.log 2>&1
# minute hour date month week command

The above command executes the python /data5/crontest.py script every two minutes, and the log file is saved to /data5/crontest.py.log.

If you still don't understand, you can take a look at the example:

Example:
Run the command /tmp/run.sh at 8:30 every day
30 8  /tmp/run.sh
Run the command /tmp/run.sh every two hours
0 */2  /tmp/run.sh

When setting, use crontab -e to set, After setting, you can use crontab -l to view, After setting, there is no need to restart the crontab service, and it will take effect immediately.

Which user do you use to run crontab -e, then when it is executed, it is executed as that user