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The Linux Command Line by William E. Shotts Jr.

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Chapter 19. Regular Expressions

In the next few chapters, we are going to look at tools used to manipulate text. As we have seen, text data plays an important role on all Unix-like systems, such as Linux. But before we can fully appreciate all of the features offered by these tools, we have to examine a technology that is frequently associated with the most sophisticated uses of these tools—regular expressions.

As we have navigated the many features and facilities offered by the command line, we have encountered some truly arcane shell features and commands, such as shell expansion and quoting, keyboard shortcuts, and command history, not to mention the vi editor. Regular expressions continue this “tradition” and may be (arguably) the most arcane ...

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