spinner_unicode.sh

spinner () {
    local pid=$1
    local speed=${2:-.1}
    local text=$3
    local spin="⢎⡰⢎⡡⢎⡑⢎⠱⠎⡱⢊⡱⢌⡱⢆⡱"

    local i=0
    while kill -0 "$pid" 2>/dev/null
    do
        local i=$(( (i+1) % 8))
        local c1=$(echo $spin | cut -c$(( i*6+1 ))-$(( i*6+3 )))
        local c2=$(echo $spin | cut -c$(( i*6+4 ))-$(( i*6+6 )))
        printf "\r$3$c1$c2"
        sleep "$speed"
    done
}