shell函数应用

[root@centos17 shell]# sh -v factorial.sh 
#!/bin/bash
factorial() {
factorial1=1
for((i=1;i<=5;i++));do
	factorial1=$((factorial1*i))
done
echo "5的阶乘是：$factorial1"
}

factorial
5的阶乘是：120
[root@centos17 shell]# 

[root@centos17 shell]# sh -v factorial.sh
#!/bin/bash
factorial() {
factorial1=1
for((i=1;i<=$num;i++));do
	factorial1=$((factorial1*i))
done
echo "$num的阶乘是：$factorial1"
}
num=5
factorial
5的阶乘是：120
[root@centos17 shell]# 

[root@centos17 shell]# sh -v factorial.sh 5
#!/bin/bash
factorial() {
factorial1=1
for((i=1;i<=$1;i++));do
	factorial1=$((factorial1*i))
done
echo "$1的阶乘是：$factorial1"
}
factorial $1
5的阶乘是：120
[root@centos17 shell]# 

[root@centos17 shell]# sh -v factorial.sh 5 8 10
#!/bin/bash
factorial() {
factorial1=1
for((i=1;i<=$1;i++));do
	factorial1=$((factorial1*i))
done
echo "$1的阶乘是：$factorial1"
}
factorial $1
5的阶乘是：120
factorial $2
8的阶乘是：40320
factorial $3
10的阶乘是：3628800
[root@centos17 shell]#