After reading this chapter, you should now know how to schedule a task to be performed at a specific time using the at command. You should also know the benefits of creating Cron jobs, which need to be performed multiple times. You should have also learned how to use the crontab command to add, modify, list, and remove crontab entries. You also have a good understanding of systemd—the first process created on a system—and how it manages other system processes, services, and logs. You should also know how to embed other scripting languages such as Python, AWK, Ruby, and so on, in a shell script.

After reading all of these chapters and practicing the examples, you should now be confident in shell scripting. Being a master of the command line, you are now capable of writing your own shell scripts to solve your day-to-day tasks. Finally, if anything is not covered in this book, you know that you should look into the man page of any command for help.