shell for循环练习题99乘法表

#!/bin/bash
# Crushlinux
# 2017-03-10

for one in {1..9}
do
for ((two=1;two<=$one;two++))
do
echo -n "$two x $one = $(($one*$two))  "
done
echo
done

版本二：

#!/bin/bash
#99乘法表
for i in {1..9}
do
for j in {1..9}
do
echo -n "$j*$i=$(expr $j \* $i) "
if [ $j == $i ];then
echo -e '\n'    #-e 允许对后面\做出解释
break
fi
done
done

版本三：

#!/bin/bash

for i in {1..9}
do
for j in {1..9}
do
if [ $j -le $i ]
then
echo  -n "$j x $i = $(($j*$i))   "

fi
done
echo
done