任意键进行下一步

#!/bin/bash
getchar()
{
        oldstty=`stty -g`
        stty -icanon -isig -echo min 1 time 0
        dd bs=1 count=1 /dev/null
        stty $oldstty
}
echo "WOCAO"
echo "Fuck input :"
char=`getchar`
echo -e "\rFuck!"