*for循环的嵌套
#!/bin/bash
for((i=1;i<=9;i++))
do
for((j=1;j<=i;j++))
do
let "temp=j*i"
echo -n "$j*$i=$temp "
done
echo ""
done
===========================================================
*while循环的嵌套
#!/bin/bash
i=1
while(($i<=9))
do
j=0
while(($j<$i))
do
let "j++"
let "temp=j*i"
echo -n "$j*$i=$temp "
done
let "i++"
echo ""
done
结果：
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
