计算阶乘的BASH SHELL代码

#!/bin/bash

#jc.sh

#计算阶乘的BASH SHELL代码

t=1

s=1

if [ $1 -ge 13 ]

then

echo input must be less than 13.

else

while [ $t -le $1 ]

do

let s=s*t

let t=t+1

done

echo $1! equals $s.

fi