All scripts for this chapter can be found on GitHub: https://github.com/PacktPublishing/Learn-Linux-Shell-Scripting-Fundamentals-of-Bash-4.4/tree/master/Chapter13. Apart from your Ubuntu Linux virtual machine, no other resources are needed to complete the examples in this chapter. For the argument-checker.sh, functions-and-variables.sh, library-redirect-to-file.sh scripts only the final version is found online. Be sure to verify the script version in the header before executing it on your system.