Update 'bash/README.md'

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How to declare an array, append new elements, iterate over the array for processing. How to declare an array, append new elements, iterate over the array for processing.
## associative_array.bash
Numerical arrays are referenced using integers, and associative are referenced using strings. Associative Arrays can be handy when you want the key to have meaning.
## booleans.bash ## booleans.bash
BASH doesn't actually have booleans, but there's tricks to make variables behave enough like bools to be useful. BASH doesn't actually have booleans, but there's tricks to make variables behave enough like bools to be useful.