As Smiling Dragon mentioned it's against the forum's rules posting homework..., but at least you have put some effort:
Code:
echo "Enter a number"
read number
echo "What do you want to do to this number?"
echo "Enter d, to count down to zero"
echo "Enter u, to count up from zero"
read choice
case $choice in
d) while [ "$number" -ge 0 ]
do
echo $number
number=`expr $number - 1` # no spaces here before/after = sign
done;;
u) while [ 0 -le "$number" ]
do
echo $number
number=`expr $number + 1`
done;;
esac
echo "bye"
~
