function rotate_line
{
    INTERVAL=1 # Sleep time between “twirls”
    TCOUNT=”0” # For each TCOUNT the line twirls one increment
    while : # Loop forever...until this function is killed
    do
        TCOUNT=`expr $TCOUNT + 1` # Increment the TCOUNT
        case $TCOUNT in
            “1”) echo ‘-’”\b\c”
                sleep $INTERVAL
                Scripting Quick Start and Review 35
                Free & Share & Open
            ;;
            “2”) echo ‘\\’”\b\c”
                sleep $INTERVAL

do_swirl () {
    interval=0.2
    while true; do
        case $(( ++tcount % 4 )) in
            0) swirl='-' ;;
            1) swirl='\\' ;;
            2) swirl='|' ;;
            3) swirl='/' ;;
        esac
        printf '%c\b' "$swirl"
        sleep "$interval"
    done
}

do_swirl2 () {
    swirl=( '-' '\\' '|' '/' )
    interval=0.2
    while true; do
        printf '%c\b' "${swirl[++tcount % 4]}"
        sleep "$interval"
    done
}