December 2018
Beginner
452 pages
12h 17m
English
Content preview from Learn Linux Shell Scripting - Fundamentals of Bash 4.4
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Summary
This chapter explained regular expressions, and two common tools that use them under Linux: grep and sed.
We began by explaining that regular expressions are search patterns, used in combination with text to find matches. These search patterns allow us to search very flexibly in text where its contents are not necessarily known at runtime.
Search patterns allow us, for example, to look only for words and not numbers, for words at the beginnings or endings of lines, or for empty lines. Search patterns include wildcards, which can represent one or more of a certain character or character class.
We introduced the grep command to show how we can use the basic functionality of regular expressions in Bash.
The second part of this chapter ...
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