Array

Initialization of an Array

myArray=("cat" "dog" "mouse" "frog")

Or for associative array

declare -a myArray

Ref: https://www.gnu.org/software/bash/manual/html_node/Arrays.html

Accessing Array element

Array Syntax	Meaning
${myArray[0]}	1st Element of Array
${myArray[@]}	Loop Through all element
${#myArray[@]}	Number of Element of Array
${myArray[-1]}	Last Element of the array
${myArray[@]:2:1}	1 element from index 2
${myArray[@]:2:-1}	From element index 2 to last element
${!myArray[@]}	Array indices or keys for assciative arrays

Find mroe Shell parameter expansion at https://www.gnu.org/software/bash/manual/html_node/Shell-Parameter-Expansion.html

Looping over all element of array

for str in ${myArray[@]}; do
  echo $str
done

Looping through indices

for i in ${!myArray[@]}; do
  echo "element $i is ${myArray[$i]}"
done

Ref: https://www.freecodecamp.org/news/bash-array-how-to-declare-an-array-of-strings-in-a-bash-script/