Bash script to find the parent directory of a file or dir that is located above the working dir in the hierarchy

find_parent_upwards.sh

find_parent_upwards() {
    local look=${PWD%/}

    while [[ -n $look ]]; do
        [[ -e $look/$1 ]] && {
            printf '%s\n' "$look"
            return
        }

        look=${look%/*}
    done

    [[ -e /$1 ]] && echo /
}