How to Use at and batch on Linux to Schedule Commands
If you want to schedule a Linux job that will happen only once, cron is overkill. The at family of commands is what you need! And if you want to run processes only when your system has free resources, you can use batch.
— Read on www.howtogeek.com/451386/how-to-use-at-and-batch-on-linux-to-launch-processes/