The remaining chapters in this document provide additional breadth and depth. This chapter and the next two chapters introduce the basic concepts of shell scripting. Put another way, it is often easy to write a script, but it can be more challenging to write a script that consistently works well. If you don’t true your scripts, they wobble. If you have ever successfully trued a bicycle wheel (or paid someone else to do so), that’s similar to learning the basics of shell scripting. While shell scripts can be used for more complex tasks, they are usually not the best choice. Shell scripting is generally considered to be a glue language, ideal for creating small pieces of code that connect other tools together. With a bit more experience, you become comfortable riding them around town, but also quickly discover why most people drive cars for longer trips.
You fall off and scrape your knees a lot at first. Writing a shell script is like riding a bike.
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