Learn Linux Shell Scripting - Fundamentals of Bash 4.4

Summary

We started this chapter by showing the new at command and explaining how we can use at for scheduling scripts. We described the timestamp syntax for at and how it contains a queue for all scheduled jobs. We explained how at is mostly used for ad hoc scheduled commands and scripts, before we continued to the more powerful cron scheduler.

The cron daemon, responsible for most scheduled tasks on a system, is a very powerful and flexible scheduler, which is most often used via the so-called crontab. This is a user-bound file, which contains instructions for cron on when and how to run commands and scripts. We presented the timestamp syntax that is used in a crontab.

The second part of the chapter dealt with logging our scheduled commands ...