Essential Books

List of initialized indexes

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Get the list of inialized indexes in an array 

$ arr[2]='second'
$ arr[10]='tenth'
$ arr[25]='twenty five'
$ echo ${!arr[@]}
2 10 25
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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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