shell脚本阶乘计算

1.  #!/bin/sh
2. #written by wubo
3. #blog:wbmtf.blog.51cto.com
4. ####此脚本的功能是用户输入一个大于零的数，然后计算它的阶乘，当此数小于等于零时，就停止执行
5. while :
6. do
7. fac=1
8. echo -n "for jiecheng,please input a number:"
9. read  num
10. if [ $num -le 0 ]
11. then break
12. fi
13. for i in `seq 1 $num`
14. do
15. let fac=$fac\*$i
16. done
17. echo "${num}的阶乘是:${fac}"
18. done
19.