Shell Programming and Scripting

if $num != seq 1 9
then
echo "Invalid entry. Use numbers 1-9. "

 while (( $var <= $num ))
do
  f=(( $f * $var ))
  let var++
done

tput cup 18 33 read num

tput cup 18 33; read num

[[ $num = [1..9] ]] || echo "Invalid entry. Use numbers 1-9. "

while (( $var <= $num ))
do
  f=(( $f * $var ))
  let var++
done

for ( var=0; var<= $num; var++)
do
    ((f*=var))
done

#!/bin/bash
f=2
until ((num)) # Until num is a numeric value > 0
do
    tput cup 18 33; read -p "Enter number " num
done
for ((var=1; var <= $num; var++))
do
    ((f*=$var))
    echo "$var : $f"
done