How Linux uses the at command to perform tasks

The at command in the Linux command is used to list the scheduled tasks. It is similar to the reminder function of the calendar software. With the at command, you don't need to download the software with the reminder function. What are the uses of the at command? The following small series will introduce you to the usage of the Linux at command.

In linux system, you may have discovered why the system often does some tasks automatically? Who are these tasks at their disposal? In Linux, if you want your own backup program to automatically start running under the system at some point in time, without having to manually start it, what should you do? These routine tasks may be divided into one-time work and cycle time work. Which services are responsible for the system? Also, if you want to send a letter to your wife's birthday every year to remind yourself not to forget, what should I do under Linux?

1. Command format:

at[parameter][time]

2. Command function:

Execute a specified task at a specified time, can only be executed once, and need to open the atd process (

ps -ef