shell脚本写99乘法表

可以使用循环语句和格式化输出实现，以下是一个简单的示例：

#!/bin/bash
for i in {1..9}
do
    for j in {1..9}
    do
        printf "%d x %d = %d\t" $i $j $((i*j))
    done
    echo ""
done

输出结果为：

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