Cron Scheduled Task configuration method in Linux (verbose)

Cron comes from the Greek word chronos (meaning "time"), which is the next program that automatically executes a specified task (scheduled task) on the Linux system

1. crontab Command Options

#crontab-U <-l,-R,-e>

-u Specifies a user
-l lists a user's task schedule
-R Delete a user's task
-e Edit a user's tasks

2. cron file syntax and notation

The CRONTAB-E command can be used to edit, edit the corresponding user's cron file under/var/spool/cron, or modify the/etc/crontab file directly. The specific format is as follows:

Minute Hour Day Month Week command
Minute hour day month week order
0-59 0-23 1-31 1-12 0-6 command

Cron Scheduled Task configuration method in Linux (verbose)