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Commit 3124190

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updates for version 1.3
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‎README.md‎

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@@ -21,10 +21,10 @@ You can purchase the book using these links:
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* https://gumroad.com/l/gnu_awk
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* https://leanpub.com/gnu_awk
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* You can also get the book as part of **Magical one-liners** bundle from https://gumroad.com/l/oneliners or https://leanpub.com/b/oneliners
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* You can also get the book as part of **Awesome Regex** bundle from https://leanpub.com/b/regex or https://gumroad.com/l/regex
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* You can also get the book as part of **Awesome Regex** bundle from https://gumroad.com/l/regex or https://leanpub.com/b/regex
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* See https://learnbyexample.github.io/books/ for list of other books
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For a preview of the book, see [sample chapters](https://github.com/learnbyexample/learn_gnuawk/blob/master/sample_chapters/awk_sample_chapters.pdf)
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For a preview of the book, see [sample chapters](https://github.com/learnbyexample/learn_gnuawk/blob/master/sample_chapters/gnu_awk_sample.pdf)
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The book can also be [viewed as a single markdown file in this repo](./gnu_awk.md). See my blogpost on [generating pdf from markdown using pandoc](https://learnbyexample.github.io/tutorial/ebook-generation/customizing-pandoc/) if you are interested in the ebook creation process.
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# Feedback
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Please open an issue if you spot any typo/errors.
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[Open an issue](https://github.com/learnbyexample/learn_gnuawk/issues) if you spot any typo/errors.
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I'd also highly appreciate your feedback about the book.
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:warning::warning: Please DO NOT submit pull requests. Main reason being any modification requires changes in multiple places.
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Goodreads: https://www.goodreads.com/book/show/52758608-gnu-awk
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I'd also highly appreciate your feedback about the book.
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Twitter: https://twitter.com/learn_byexample
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* [GNU awk documentation](https://www.gnu.org/software/gawk/manual/) — manual and examples
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* [stackoverflow](https://stackoverflow.com/) and [unix.stackexchange](https://unix.stackexchange.com/) — for getting answers to pertinent questions on `bash`, `awk` and other commands
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* [tex.stackexchange](https://tex.stackexchange.com/) — for help on `pandoc` and `tex` related questions
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* Cover image: [LibreOffice Draw](https://www.libreoffice.org/discover/draw/)
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* [tex.stackexchange](https://tex.stackexchange.com/) — for help on [pandoc](https://github.com/jgm/pandoc/) and `tex` related questions
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* [LibreOffice Draw](https://www.libreoffice.org/discover/draw/) — cover image
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* [pngquant](https://pngquant.org/) and [svgcleaner](https://github.com/RazrFalcon/svgcleaner) for optimizing images
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* [softwareengineering.stackexchange](https://softwareengineering.stackexchange.com/questions/39/whats-your-favourite-quote-about-programming) and [skolakoda](https://skolakoda.org/programming-quotes) for programming quotes
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* [Warning](https://commons.wikimedia.org/wiki/File:Warning_icon.svg) and [Info](https://commons.wikimedia.org/wiki/File:Info_icon_002.svg) icons by [Amada44](https://commons.wikimedia.org/wiki/User:Amada44) under public domain
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* [arifmahmudrana](https://github.com/arifmahmudrana) for spotting an ambiguous explanation
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The book is licensed under a [Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License](https://creativecommons.org/licenses/by-nc-sa/4.0/)
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The code snippets are licensed under MIT, see [LICENSE](./LICENSE) file
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‎Version_changes.md‎

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<br>
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### 1.3
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* Added note regarding use of `NR==FNR` if the first file is empty
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* Added note for `split` function when the field separator is the same as default `FS`
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* Simplified one of the examples for paragraph mode
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* Updated exercise solutions as well for this usecase
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* Updated timing data for speed comparison examples, added `mawk` results as well
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* Corrected various typos, improved descriptions, comments, external links, etc
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<br>
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### 1.2
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* Added link to exercise solutions

‎code_snippets/Field_separators.sh‎

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echo 'one;two;three;four' | awk -F';' '{print 3ドル}'
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echo '=a=b=c=' | awk -F= '{print 1ドル "," $NF "."}'
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echo '=a=b=c=' | awk -F= '{print 1ドル "[" $NF "]"}'
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echo 'goal:amazing:whistle:kwality' | awk -v FS=: '{print 2ドル}'
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‎code_snippets/Gotchas_and_Tips.sh‎

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time LC_ALL=C awk '/^([a-d][r-z]){3}$/' /usr/share/dict/words > f2
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time mawk '/^[a-d][r-z][a-d][r-z][a-d][r-z]$/' /usr/share/dict/words > f3
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diff -s f1 f2
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rm f[12]
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diff -s f2 f3
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rm f[123]
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time awk -F'a' 'NF==4{cnt++} END{print +cnt}' /usr/share/dict/words
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time LC_ALL=C awk -F'a' 'NF==4{cnt++} END{print +cnt}' /usr/share/dict/words
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time mawk -F'a' 'NF==4{cnt++} END{print +cnt}' /usr/share/dict/words
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‎code_snippets/Installation_and_Documentation.sh‎

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cd gawk-5.1.0/
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./configure
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./configure
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make
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‎code_snippets/Record_separators.sh‎

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awk -v RS= -v ORS='\n\n' '/you/' programming_quotes.txt
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awk -v RS= '/you/{print c++ ? "\n" 0ドル : 0ドル}' programming_quotes.txt
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awk -v RS= '/you/{print s 0ドル; s="\n"}' programming_quotes.txt
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s='\n\n\na\nb\n\n12\n34\n\nhi\nhello\n'
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‎code_snippets/Regular_Expressions.sh‎

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printf 'spared no one\ngrasped\nspar\n' | awk '/ed/'
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printf 'spared no one\ngrasped\nspar\n' | awk '{r = @/ed/} 0ドル ~ r'
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printf 'spared no one\ngrasped\nspar\n' | awk 'BEGIN{r = @/ed/} 0ドル ~ r'
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## String Anchors
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‎example_files/buf.awk‎

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/state/{
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f = 0
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if(buf)
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if(f)
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buf = ""
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f = 0
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}

‎exercises/Exercise_solutions.md‎

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He he he
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$ awk -F'\n' -v RS= 'NF==2 && /do/{print c++ ? "\n" 0ドル : 0ドル}' sample.txt
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$ awk -F'\n' -v RS= 'NF==2 && /do/{print s 0ドル; s="\n"}' sample.txt
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Just do-it
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Believe it
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```bash
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$ # note that there's no extra empty line at the end of the output
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$ awk 'BEGIN{FS="\n"; OFS=". "; RS=""} {1ドル=1ドル; $NF=$NF ".";
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print c++ ? "\n" 0ドル : 0ドル}' sample.txt
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print s 0ドル; s="\n"}' sample.txt
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Hello World.
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Good day. How are you.

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