What are shell scripts? Please, describe some useful notions when writing them such as pipes, redirections, etc. Describe when would you use a Makefile instead of a shell script. Provide examples of your own, of useful shell scripts and Makefiles. Hint: think of processes you find useful to automate in your daily work life or during software development. Attention: examples that can be found online or given in the slides during the class are not accepted.