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The Ultimate Linux Shell Scripting Guide
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This is the first of two chapters in which I introduce the concept of text-stream filters. We’ll look at what they are and how to use them from the command-line. In the following chapters, I’ll present some examples of how these filter utilities can be used in shell scripts.
There are two reasons why you should learn about these various utilities. First, they’re very helpful if you need to create shell scripts that can automate the creation of different types of documents, such as reports. The second reason is that they are covered on certain Linux certification exams, such as the CompTIA Linux+/Linux Professional Institute exams.
Topics in this chapter include:
cat
tac
cut
paste
join
sort
Okay, let’s get cracking, shall we?