用shell脚本输出99乘法表

用shell脚本输出99乘法表

效果：

1 * 1 = 1
1 * 2 = 2	2 * 2 = 4
1 * 3 = 3	2 * 3 = 6	3 * 3 = 9
1 * 4 = 4	2 * 4 = 8	3 * 4 = 12	4 * 4 = 16
1 * 5 = 5	2 * 5 = 10	3 * 5 = 15	4 * 5 = 20	5 * 5 = 25
1 * 6 = 6	2 * 6 = 12	3 * 6 = 18	4 * 6 = 24	5 * 6 = 30	6 * 6 = 36
1 * 7 = 7	2 * 7 = 14	3 * 7 = 21	4 * 7 = 28	5 * 7 = 35	6 * 7 = 42	7 * 7 = 49
1 * 8 = 8	2 * 8 = 16	3 * 8 = 24	4 * 8 = 32	5 * 8 = 40	6 * 8 = 48	7 * 8 = 56	8 * 8 = 64
1 * 9 = 9	2 * 9 = 18	3 * 9 = 27	4 * 9 = 36	5 * 9 = 45	6 * 9 = 54	7 * 9 = 63	8 * 9 = 72	9 * 9 = 81

脚本：

写法1：

#!/bin/bash
for x in `seq 9`
do
	for y in `seq $x`
	do
		printf "$y * $x = $(($x *$y))\t"
	done
	printf "\n"
done

写法2：

#!/bin/bash
for ((x=1;x<=9;x++))
do
	for ((y=1;y<=$x;y++))
	do
		printf "$y * $x = $(($x * $y))\t"
	done
	printf "\n"
done

写法3：

#!/bin/bash
for x in {1..9}
do
	for ((y=1;y<=$x;y++))
	do
		printf "$y * $x = $(($x*$y))\t"
	done
	printf "\n"
done

倒状的九九乘法表

效果：

1 * 9 = 9	2 * 9 = 18	3 * 9 = 27	4 * 9 = 36	5 * 9 = 45	6 * 9 = 54	7 * 9 = 63	8 * 9 = 72	9 * 9 = 81
1 * 8 = 8	2 * 8 = 16	3 * 8 = 24	4 * 8 = 32	5 * 8 = 40	6 * 8 = 48	7 * 8 = 56	8 * 8 = 64
1 * 7 = 7	2 * 7 = 14	3 * 7 = 21	4 * 7 = 28	5 * 7 = 35	6 * 7 = 42	7 * 7 = 49
1 * 6 = 6	2 * 6 = 12	3 * 6 = 18	4 * 6 = 24	5 * 6 = 30	6 * 6 = 36
1 * 5 = 5	2 * 5 = 10	3 * 5 = 15	4 * 5 = 20	5 * 5 = 25
1 * 4 = 4	2 * 4 = 8	3 * 4 = 12	4 * 4 = 16
1 * 3 = 3	2 * 3 = 6	3 * 3 = 9
1 * 2 = 2	2 * 2 = 4
1 * 1 = 1

写法1：

#!/bin/bash
for ((x=9;x>0;x--))
do
	for ((y=1;y<=$x;y++))
		do
			printf "$y * $x = $(($x * $y))\t"
		done
	printf "\n"
done