1 [root@kuaiwei scripts]# cat 99form_.sh
 2 #!/bin/sh
 3 for a in `seq 9`
 4 do
 5     for b in `seq 9`
 6     do
 7          [ $a -ge $b ] && echo -en "$a × $b = $(expr $a \* $b) "
 8     done
 9 echo " "
10 done

 1 [root@kuaiwei scripts]# sh 99form_.sh   
 2 1 × 1 = 1 
 3 2 × 1 = 2 2 × 2 = 4 
 4 3 × 1 = 3 3 × 2 = 6 3 × 3 = 9 
 5 4 × 1 = 4 4 × 2 = 8 4 × 3 = 12 4 × 4 = 16 
 6 5 × 1 = 5 5 × 2 = 10 5 × 3 = 15 5 × 4 = 20 5 × 5 = 25 
 7 6 × 1 = 6 6 × 2 = 12 6 × 3 = 18 6 × 4 = 24 6 × 5 = 30 6 × 6 = 36 
 8 7 × 1 = 7 7 × 2 = 14 7 × 3 = 21 7 × 4 = 28 7 × 5 = 35 7 × 6 = 42 7 × 7 = 49 
 9 8 × 1 = 8 8 × 2 = 16 8 × 3 = 24 8 × 4 = 32 8 × 5 = 40 8 × 6 = 48 8 × 7 = 56 8 × 8 = 64 
10 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