shell倒立打印乘法口诀表

#!/bin/bash
for ((i=9;i>0;i--));do
        for ((j=1;j<=i;j++));do
                let "chengji=$i*$j"
                echo -n "$j*$i=$chengji "
        done
echo
done

正常打印

#!/bin/bash
for ((i=1;i<10;i++));do
    for ((j=1;j<=i;j++)); do
        let "chengji=$i*$j"
        echo -n "$i*$j=$chengji "
    done
echo
done


#!/bin/bash
for ((i=1;i<10;i++)); do
        for ((j=1;j<=i;j++)); do
                #let "chengji=i * j"
                #((chengji=i*j))
                #chengji=$i*$j
                chengji=$((i*j))
                #chengji=$[i*j]
                #chengji=`expr $i \* $j`
                #chengji=`echo $i*$j|bc`
                echo -n "$j*$i=$chengji "
        done
echo

done

来源：CSDN

作者：A4m1n

链接：https://blog.csdn.net/qq_41059600/article/details/99693294