Simple spinner implemented in shell

spiner(){
    trap 'tput cnorm' EXIT INT
    local s=$(($SECONDS +$1))
    tput civis
    while [[ $SECONDS -lt $s ]]; do
        for f in '|' '\' '-' '/';do echo -n "$f"
            sleep .2s
            echo -n $'\b'
        done
    done
    tput cnorm
}