Bash: Assign the output of a command to an array element?

Fenster

I am writing a script where I interactively receive input from the user. I'd ideally like to read the answers into an array. Code in question:

    for q in $(seq 0 ${#img_question[@]}); do
        until [[ $[img_answer[$q]} == '^[0-9]+([.][0-9]+)?$' ]]; do
            echo -ne ${img_question[$q]}
            read ${img_answer[$q]}
        done
    done

I'm taking in straight numerical values. The thing is, values recorded by the array element are null, empty. I've worked through a few permutations of this, but nothing seems to work. I've tried to indirectly assign to the array element through an intermediary variable, but it is treated as a command. Example:

[me][~] # read ans
Testing
[me][~] # echo $ans
Testing
[me][~] # {test_array[0]}=$ans
-bash: {test_array[0]}=Testing: command not found

What's the best way (if any) to accomplish this?

pickarooney

In the second part, should you use a 'let' for the assignment of the $ans variable to the first slot in the array?

Fenster

I think I might have it now. Your suggestion was wrong, but it starkly illuminated my mistake.

pickarooney

Glad to be the blacklight

Fenster

I was using completely the wrong syntax:

        until [[ $img_answer[$q] == $is_valid ]]; do
            echo -ne ${img_question[$q]}
            read img_answer[$q]
            # Validation
        done

I was simultaneously trying to call the variable, and assign to it, which Bash couldn't handle.