What are some common array operations in shell scripting?

Here are some common array operations in shell scripting:

1. Declaring an Array:

   my_array=(value1 value2 value3)

2. Accessing Elements:

   echo ${my_array[0]}  # Access the first element

3. Getting the Length of an Array:

   echo ${#my_array[@]}  # Number of elements in the array

4. Iterating Over an Array:

   for element in "${my_array[@]}"; do
       echo $element
   done

5. Adding Elements:

   my_array+=(value4)  # Append a new element

6. Removing Elements:

   unset my_array[1]  # Remove the second element

7. Slicing an Array:

   echo ${my_array[@]:1:2}  # Get elements from index 1 to 2

8. Finding Common Elements Between Two Arrays:

   a=(1 2 3)
   b=(2 3 4)
   common=()
   for x in "${a[@]}"; do
       for y in "${b[@]}"; do
           if [ $x -eq $y ]; then
               common+=($x)
           fi
       done
   done
   echo "Common elements: ${common[@]}"

These operations are fundamental for manipulating arrays in shell scripts.