print_missing_entries () {

    #Extract entries from base file (English)
    BASE_ENTRY_KEYS=($( grep "#" ${SCRIPT_INPUT_FILE_0} | awk -F ' = ' '{print $1}' ))

    #The filename is formatted as "SCRIPT_INPUT_FILE_0", "SCRIPT_INPUT_FILE_1"
    #in which SCRIPT_INPUT_FILE_0 is the base file
    for COUNTER in {1..8}
    do
        tmp="SCRIPT_INPUT_FILE_$COUNTER"
        filename=${!tmp}

        #Extract entries from compared file
        COMPARED_ENTRY_KEYS=($( grep "#" $filename | awk -F ' = ' '{print $1}' ))

        #Array contains mismatched entries
        RES=(`echo ${BASE_ENTRY_KEYS[@]} ${COMPARED_ENTRY_KEYS[@]} | tr ' ' '\n' | sort | uniq -u `)

        count=${#RES[@]}

        #Throw warning if there are missing entries
        if [ $count -gt 0 ]
        then
        echo "warning: found unmatched entries in $filename"
            for entry in "${RES[@]}"
            do
                echo "$entry"
            done
        fi
    done
}

print_missing_entries