shell脚本多重循环小实验

一、99乘法表

#!/bin/bash

for ((a=1;a<=9;a++))

do

for ((b=1;b<=$a;b++))

do

c=$[$a*$b]

echo -n -e "$a*$b=$c\t"

done

echo ""

done

二、矩形

#!/bin/bash

for ((a=1;a<=5;a++))

do

for ((b=1;b<=10;b++))

do

echo -n "*"

done

echo ""

done

三、直线

#!/bin/bash

for ((a=1;a<=15;a++))

do

echo -n "*"

done

echo ""

四、正直角三角形

#!/bin/bash

for ((a=1;a<=9;a++))

do

for ((b=1;b<=$a;b++))

do

echo -n "*"

done

echo ""

done

五、反直角三角形

1、 空格矩形加三角

#!/bin/bash

for ((a=1;a<=9;a++))

do

for ((b=1;b<=10;b++))

do

echo -n " "

done

for ((c=1;c<=$a;c++))

do

echo -n "*"

done

echo ""

done

2、空格倒三角加三角

#!/bin/bash

for ((a=1;a<=9;a++))

do

for ((b=9;b>=$a;b--))

do

echo -n " "

done

for ((c=1;c<=$a;c++))

do

echo -n "*"

done

echo ""

done

六、倒直角三角形

#!/bin/bash

for ((a=1;a<=9;a++))

do

for ((b=9;b>=$a;b--))

do

echo -n "*"

done

echo ""

done

七、等腰直角三角形

1、算法计算 $a*2-1

#!/bin/bash

for ((a=1;a<=9;a++))

do

for ((b=9;b>=$a;b--))

do

echo -n " "

done

for ((c=1;c<=$[$a*2-1];c++))

do

echo -n "*"

done

echo ""

done

2、三角加小三角

#!/bin/bash

for ((a=1;a<=9;a++))

do

for ((b=9;b>=$a;b--))

do

echo -n " "

done

for ((c=1;c<=$a;c++))

do

echo -n "*"

done

for ((d=2;d<=$a;d++))

do

echo -n "*"

done

echo ""

done

八、等腰梯形

#!/bin/bash

for ((a=1;a<=9;a++))

do

for ((b=9;b>=$a;b--))

do

echo -n " "

done

for ((c=1;c<=9;c++))

do

echo -n "*"

done

for ((d=1;d<=$[$a*2-1];d++))

do

echo -n "*"

done

echo ""

done

九、菱形

#!/bin/bash

for ((a=1;a<=9;a++))

do

for ((b=9;b>=$a;b--))

do

echo -n " "

done

for ((c=1;c<=$[$a*2-1];c++))

do

echo -n "*"

done

echo ""

done

for ((d=1;d<=10;d++))

do

for ((e=2;e<=$d;e++))

do

echo -n " "

done

for ((f=10;f>=$d;f--))

do

echo -n "*"

done

for ((g=9;g>=$d;g--))

do

echo -n "*"

done

echo ""

done

十、可调节大小菱形

#!/bin/bash

read -p "输入大小" i

for ((a=1;a<=$i;a++))

do

for ((b=$i;b>=$a;b--))

do

echo -n " "

done

for ((c=1;c<=$[$a*2-1];c++))

do

echo -n "*"

done

echo ""

done

for ((d=1;d<=$i+1;d++))

do

for ((e=1;e<=$d-1;e++))

do

echo -n " "

done

for ((f=2*$i+1;f>=$[$d*2-1];f--))

do

echo -n "*"

done

echo ""

done