Answer by JayCravens for dir command: force output to one filename per line, full path included, but nothing else

It's a bit messy, but I got it in one line:

readarray <<< $(dir -1) dir_list; for line in "${dir_list[@]}"; do printf "%s\n" "$line"; done | xargs -I {} echo "$PWD/{}"

It separates each dir -1 into individual "line"s, then iterates the array, appending the echo of $PWD to each xargs line.