Essential Books

Array from string

suggest change 
stringVar="Apple Orange Banana Mango"
arrayVar=(${stringVar// / })

Each space in the string denotes a new item in the resulting array. 

echo ${arrayVar[0]} # will print Apple
echo ${arrayVar[3]} # will print Mango

Similarly, other characters can be used for the delimiter. 

stringVar="Apple+Orange+Banana+Mango"
arrayVar=(${stringVar//+/ })
echo ${arrayVar[0]} # will print Apple
echo ${arrayVar[2]} # will print Banana
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Arrays:
* Arrays
* Array Assignments
* Accessing Array Elements
* Array Modification
* Array Length
* Array Iteration
* Associative Arrays
* Looping through an array
* Destroy Delete or Unset an Array
* List of initialized indexes
* Array from string
* Reading an entire file into an array
* Array insert function
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