#!/bin/bash
array=(one two three)
echo "Printing first object in array."  #Replace 0 with the place number of the array item
echo ${array[0]}

echo ""

echo "Whole array"
echo ${array[*]} 

echo "" 

echo "Array indexes" 
echo ${!array[*]}

Output

Printing first object in array. 
one

Whole array
one two three

Array indexes
0 1 2

https://www.linuxjournal.com/content/bash-arrays