Shell脚本打印99乘法表

[root@localhost ~]# vim 99.sh 
#!/bin/bash
for i in  `seq 9`
do
for j in `seq 9`
do
[ $j -le $i ] &&  echo  -n  "$i*$j= `echo $(($i*$j))` "
done
echo "  "
done
[root@localhost ~]# chmod +x 99.sh 
[root@localhost ~]# ./99.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