在shell脚本中获取3个数组中的公共元素

#!/bin/bash

array1=("apple" "banana" "orange" "grape")
array2=("banana" "grape" "watermelon" "kiwi")
array3=("grape" "kiwi" "mango" "pineapple")

commonArray=()

for element in "${array1[@]}"
do
    foundInArray2=false
    foundInArray3=false
    
    for item in "${array2[@]}"
    do
        if [ "$element" == "$item" ]
        then
            foundInArray2=true
            break
        fi
    done
    
    for item in "${array3[@]}"
    do
        if [ "$element" == "$item" ]
        then
            foundInArray3=true
            break
        fi
    done
    
    if [ "$foundInArray2" == true ] && [ "$foundInArray3" == true ]
    then
        commonArray+=("$element")
    fi
done

echo "公共元素：${commonArray[@]}"