Array
#!/bin/bash

array=('Lin' 'Chen')
array[2]="Yanhua"

echo ${array[0]}
echo ${array[1]}

echo ${array[*]}
echo ${array[@]}

for i in ${array[*]}
do
	echo $i
done

array2=("${array[@]}") # create a copy
array2[0]="Chen"
echo ${array[@]}
echo ${array2[@]}

echo ${#array[@]} # 3, array size

array=(a b c d e f g h i j)
echo ${array[@]:3:2}         # prints d e
			
Reference