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Bash V2 grammar
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.. POSIX shell grammar: http://pubs.opengroup.org/onlinepubs/009695399/utilities/xcu_chap02.html
   Good read: https://docstore.mik.ua/orelly/unix/upt/ch08_19.htm
   Read: https://www.safaribooksonline.com/library/view/learning-the-bash/1565923472/pr01.html
   Source: https://www.safaribooksonline.com/library/view/mastering-unix-shell/9780470183014/

This grammar is defined with the `BNF <https://en.wikipedia.org/wiki/Backus%E2%80%93Naur_form>`_ syntax for context-free grammars.
The syntax is valid for `US-ASCII <https://en.wikipedia.org/wiki/ASCII>`_ encoded text.

.. literalinclude:: bash-2.bnf
  :linenos:
  :language: bnf