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added details about the ebook version
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gnu_awk.md

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* [Gotchas and Tips](#gotchas-and-tips)
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* [Further Reading](#further-reading)
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<br> <br> <br>
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:information_source: :information_source: This chapter has been converted into a better formatted ebook: https://learnbyexample.github.io/learn_gnuawk/. The ebook also has content updated for newer version of the commands, includes a chapter on regular expressions, has exercises, solutions, etc.
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For markdown source and links to buy pdf/epub versions, see: https://github.com/learnbyexample/learn_gnuawk
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<br> <br> <br>
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```bash
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$ awk --version | head -n1
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* familiarity with regular expressions
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* if not, check out **ERE** portion of [GNU sed regular expressions](./gnu_sed.md#regular-expressions) which is close enough to features available in `gawk`
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* this tutorial is primarily focussed on short programs that are easily usable from command line, similar to using `grep`, `sed`, etc
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* this tutorial has also been [converted to an ebook](https://github.com/learnbyexample/learn_gnuawk) with additional descriptions, examples, a chapter on regular expressions, etc.
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* see [Gawk: Effective AWK Programming](https://www.gnu.org/software/gawk/manual/) manual for complete reference, has information on other `awk` versions as well as notes on POSIX standard
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<br>

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