shell腳本100例之五

編寫99乘法表
[root@1-CentOS-7-30-LAMP scripts]# cat chengfabiao.sh
#!/bin/bash

for((i=1;i<10;i++))
do
for((j=1;j<=i;j++))
do
echo -n "$i $j = $(($i$j))"
echo -n " "

done
echo " "
done
總結嵌套for循環的使用；以及echo命令與數字運算符號的使用。
[root@1-CentOS-7-30-LAMP scripts]# sh chengfabiao.sh
1 1 = 1
2 1 = 2 2 2 = 4
3 1 = 3 3 2 = 6 3 3 = 9
4 1 = 4 4 2 = 8 4 3 = 12 4 4 = 16
5 1 = 5 5 2 = 10 5 3 = 15 5 4 = 20 5 5 = 25
6 1 = 6 6 2 = 12 6 3 = 18 6 4 = 24 6 5 = 30 6 6 = 36
7 1 = 7 7 2 = 14 7 3 = 21 7 4 = 28 7 5 = 35 7 6 = 42 7 7 = 49
8 1 = 8 8 2 = 16 8 3 = 24 8 4 = 32 8 5 = 40 8 6 = 48 8 7 = 56 8 8 = 64
9 1 = 9 9 2 = 18 9 3 = 27 9 4 = 36 9 5 = 45 9 6 = 54 9 7 = 63 9 8 = 72 9 * 9 = 81