#to create an array:
$ declare -a my_array
#set number of items with spaceBar seperation:
$ my_array = (item1 item2)
#set specific index item:
$ my_array[0] = item1
bash array
ss="abcdefghi"
my_array=( `echo $ss | grep -o . ` ) # split word into array
echo ${my_array[2]}
give c
i=0
echo ${my_array[$i]}${my_array[$i+1]}xxx
give : abxxx