shell 99乘法表

#!/bin/bash
for (( i=1;i<=9;i++))
do
    for ((j=1;j<=i;j++))
    do
        let sum=i*j
        printf "%-8s" $j"x"$i=$sum
    done
    echo
 
done

 

#!/bin/bash

for(( i=1 ;i<=9;i++ ))
do
   for(( j=1;j<=9;j++ ))
   do
      [ $j -le $i ] && echo -n "$i*$j=$[ $i * $j ]  "
   done
   echo ''
done