Countdown with

countsheep.bash

countsheep(){
    hr=$1
    min=$2
    sec=$3

    if [ -z "$4" ]
    then
        prefix=""
    else
        prefix="$4"
    fi

    while [ $hr -ge 0 ]; do
        while [ $min -ge 0 ]; do
            while [ $sec -ge 0 ]; do
                echo -ne "${prefix}$(printf %02d "$hr"):$(printf %02d "$min"):$(printf %02d "$sec")\033[0K"
                sec=$((sec-1))
                sleep 1
                echo -ne "\r"
            done
        sec=59
        min=$((min-1))
        done
    hr=$((hr-1))
    done
}

# Usage: 
# coutnsheep h m s "Prefix if desired"
# example:
# countsheep 1 30 0 "Time until next action: "
# will print:
# Time Until next action: 01:30:00