function countdown() {
local i;
sleep 1
for ((i=$1 - 1;i>=1;i--));do
printf ‘\b\b%02d‘ "$i"
sleep 1
done
}
export LANG=en_US.UTF8;
if [ -f /root/.showfuelmenu ];then
./root/.showfuelmenu
fi
if [[ "$showmenu" == "yes" || "showmenu" == "YES" ]];then
fuelmenu
else
echo
echo -n "press a key to enter Fuel Setup (or press ESC to skip)... 15"
countdown 15 & pid=$!
if ! read -s -n 1 -t 15 key;then
echo -e "\nSkipping Fuel Setup..."
echo -n "Applying default Fuel setings..."
fuelmenu --save-only --iface=eth0
原文地址:http://www.cnblogs.com/ruiy/p/fuelSource.html