In this chapter, we will introduce the following topics:
- Running a program continuously (forever) using looping constructs or recursion
- Keeping programs/scripts running after logoff
- Invoking commands when they require permissions
- Sanitizing user input and for repeatable results
- Making a simple multi-level user menu using select
- Generating and trapping signals for cleanup
- Using temporary files and lock files in your program
- Leveraging timeout when waiting for command completion
- Creating a file-in-file-out program and running processes in parallel
- Executing your script on startup
