A few different ways to grab input in a bash script.

01-positional-arguments-to-array.bash

#!/usr/bin/env bash

# assign "$1" and "$2", which are the first and second positional arguments,
# as items 0 and 1 in the `arr` array.
arr=("$1" "$2")

printf "\n\nthe final values are: %s\n" "${arr[*]}"

02-prompt-the-user-for-input.bash

#!/usr/bin/env bash

# Prompt the user for some information, and add the input to an array.
# It'd be a good idea to perform validation on the provided input, which
# we do not do below in order to keep the example simple.

declare -a arr

read -p "What is your username? " -r username

arr+=("$username")

read -p "What is your favorite color? " -r color

arr+=("$color")

printf "\n\nthe final values are: %s\n" "${arr[*]}"

03-prompt-in-a-loop.bash

#!/usr/bin/env bash

# A bit more advanced now, we're going to let the user add any number of values
# to the array by using a loop.

declare -a arr

# present a introductory prompt to the user
echo "enter values, one on each line. Ctrl+D or a blank entry exits."

while read -p "add value: " -r value || printf "\n" ; do

    # if the input is empty, stop prompting for a value
    if test -z "$value"; then
        break
    fi

    # append the user's input to an array
    arr+=("$value")
done

printf "\n\nthe final values are: %s\n" "${arr[*]}"