First PR for gnu grep
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Added entry for BRE/ERE regex information.
Realised that I would need `grep` 3.8 to go through the exercise (the one that comes with MacOS is old as the medieval times!)
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This pull request includes updates to the documentation for learning resources related to GNU
grepand other essential GNU utilities. The most important changes include adding detailed instructions and examples for usinggrep, exercises for practicinggrepcommands, and installation instructions for essential GNU utilities on MacOS.Documentation updates:
README.md: Added a new introduction and table of contents to improve navigation.Guides and exercises:
gnu-grep/README.md: Created a comprehensive guide on GNUgrep, including examples, command references, and explanations of regular expressions.gnu-grep/exercises/chapter_2/README.md: Added exercises for practicinggrepcommands with detailed instructions and expected outputs.Installation instructions:
gnu-grep/gnu-essentials-mac.md: Provided instructions for installing essential GNU utilities on MacOS using Homebrew, including necessary configuration steps.