Let's say you have an list named fruit that contains the following values. Notice apple is listed twice. A for loop can be used to iterate over each item in the list, like this.

#!/bin/bash

fruits=(banana apple orange apple grapes)

for fruit in ${fruits[@]}; do
  echo $fruit
done

Which should return the following. Notice apple is still listed twice.

banana
apple
orange
apple
grape

Here is how you can remove duplicate values from the list while preserving the original order of the list (no sort).

#!/bin/bash
  
fruits=(banana apple orange apple grapes)

fruits=($(echo ${fruits[@]} | tr [:space:] '\n' | awk '!a[$0]++'))

for fruit in ${fruits[@]}; do
  echo $fruit
done

Here is how you can sort the list alphabetically and then only return unique values.

IFS=$'\n'
fruit=($(sort --uniq <<<"${fruit[*]}"))
unset IFS

A for loop can be used to iterate over each item in the list.

for myFruit in ${sorted[@]}; do
  echo $myFruit
done

Which should return the following. Notice that apple is now only listed once.

apple
banana
grape
orange