crontab 实现每10秒执行

* * * * * /usr/bin/python3 /root/test.py > /tmp/update.log

* * * * * sleep 15; /usr/bin/python3 /root/test.py >> /tmp/update.log

* * * * * sleep 30; /usr/bin/python3 /root/test.py >> /tmp/update.log

* * * * * sleep 45; /usr/bin/python3 /root/test.py >> /tmp/update.log

* * * * * sleep 60; /usr/bin/python3 /root/test.py >> /tmp/update.log