Shell script multi loop experiment

One 、99 Multiplication table

#!/bin/bash

for ((a=1;a<=9;a++))
do
for ((b=1;b<=$a;b++))doc=$[$a\ast$b]
echo -n -e “$a\ast$b=$c\t”

done
echo “”

done

Two 、 rectangular

#!/bin/bash

for ((a=1;a<=5;a++))
do
for ((b=1;b<=10;b++))
do
echo -n “*”
done

echo “”
done

3、 ... and 、 A straight line

#!/bin/bash
for ((a=1;a<=15;a++))
do
echo -n “*”
done
echo “”

Four 、 Right triangle

5、 ... and 、 An inverted right triangle

#!/bin/bash
for ((a=1;a<=9;a++))
do
for ((b=9;b>=$a;b–))
do
echo -n “*”
done
echo “”
done

6、 ... and 、 Isosceles right triangle

#!/bin/bash
for ((a=1;a<=9;a++))
do
for ((b=9;b>=$a;b–))
do
echo -n " "
done

for ((c=1;c<=$[$a2-1];c++))
do
echo -n ""
done
echo “”
done