cron expression

By modifying the cron expression, execute the script regularly

Learn the basic writing of cron expressions

1, cron 6-digit expression

, stands for and , such as 0 0,12,18 * * * means `execute once every day at 0 o'clock, 12 o'clock, and 18 o'clock)
* stands for any value, such as * * * * * stands for execute every minute
/ stands for every, such as 10-20/5 * * * * stands for the 10th-20th minute of every hour, which is executed every 5 minutes, namely the 10th minute, 15th minute, and 20th minute Minutes`
- Special case: you can omit /1 when you want to express that it will be executed every 1 minute

60 * * * * * Ideal: Execute once every 60th second of every minute. Actual: Unable to execute. Reason: 60 is not allowed in the second bit. Correct expression: 0 * * * * *
* 12-18 * * * Ideal: It will be executed once every day from 12:18 to 0:00. Actual: It will be executed every 1 minute from 12 am to 18 am every day. Reason: The first place is *. Correct expression: 0 12-18 * * *
- * 12-18 * * * Reasons for listing: classic demonstration by group friends, collective blindness series
0 18-12 * * * Ideal: It will be executed once every day from 18:00 to 12:00 the next day at the 0 minute. Actual: Unable to execute. Reason: The time scale cannot be crossed. Correct expression: 0 18-23,0-12 * * *
*/90 * * * * * Ideal: it will be executed every 90 seconds. Actual: It is executed every 60 seconds. Reason: Second is only 60, when it is greater than 60, it will be calculated as 60. Correct expression: currently unable to do it, recommend the curve to save the country

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