Shell-循环之“益智小游戏”

一、直线

①竖着的直线

#!/bin/bash

for ((i=1;i<=20;i++))
do
 echo "|"
done

②横着的直线

#!/bin/bash

for ((i=1;i<=20;i++))
do
 echo -n "--"
done
 echo ""

二、矩形

长为7宽为3的矩形

#!/bin/bash

for ((i=1;i<=3;i++))
do

 for ((b=1;b<=7;b++ ))
 do
 echo -n "❄"
 done
 
echo ""
done

三、99乘法表

#!/bin/bash
#for循环99乘法表
for (( a=1;a<=9;a++ ))
do
 for (( b=1;b<=$a;b++ ))
 do
 c=$[$a*$b]
 echo -n -e "$b*$a=$c\t"
 done
 echo ""
done

四、三角形

①正直角三角形

#!/bin/bash

for ((i=1;i<=10;i++))
do

 for ((b=1;b<=$i;b++ ))
 do
 echo -n "❄"
 done

echo ""
done

②倒反直角三角形

#!/bin/bash

for ((i=10;i>=1;i--))
do

 for ((b=1;b<=$i;b++ ))
 do
 echo -n "❄"
 done

echo ""
done

③反直角三角形

#!/bin/bash

for ((i=1;i<=10;i++))
do

  for ((b=10;b>=$i;b--))
  do
  echo -n " "
  done
    for ((c=1;c<=$i;c++))
    do
    echo -n "★"
    done

echo ""
done

④倒直角三角形

#!/bin/bash

for ((i=10;i>=1;i--))
do

  for ((b=10;b>=$i;b--))
  do
  echo -n " "
  done
    for ((c=1;c<=$i;c++))
    do
    echo -n "★"
    done

echo ""
done

⑤等腰三角形（尖头向上）

#!/bin/bash

for ((i=1;i<=10;i++))
do

  for ((b=10;b>=$i;b--))
  do
  echo -n " "
  done
    for ((c=1;c<=$i;c++))
    do     
    echo -n "*"
    done
      for ((d=2;d<=$i;d++))
      do
      echo -n "*"
      done
echo ""
done

⑥等腰三角形（尖头向下）

#!/bin/bash

for ((i=10;i>=1;i--))
do

  for ((b=10;b>=$i;b--))
  do
  echo -n " "
  done
    for ((c=1;c<=$i;c++))
    do
    echo -n "*"
    done
      for ((d=2;d<=$i;d++))
      do
      echo -n "*"
      done

echo ""
done

五、菱形

#!/bin/bash

for ((i=1;i<=10;i++))
do

  for ((b=10;b>=$i;b--))
  do
  echo -n " "
  done
    for ((c=1;c<=$i;c++))
    do
    echo -n "8"
    done
      for ((d=2;d<=$i;d++))
      do
      echo -n "8"
      done
echo ""
done

for ((i=10;i>=1;i--))
do

  for ((b=10;b>=$i;b--))
  do
  echo -n " "
  done
    for ((c=1;c<=$i;c++))
    do
    echo -n "8"
    done
      for ((d=2;d<=$i;d++))
      do
      echo -n "8"
      done

echo ""
done

六、平行四边形

①

#!/bin/bash

for ((i=1;i<=5;i++))
do
 for ((a=1;a<=$i;a++))
 do
 echo -n " "
 done
   for ((b=1;b<=7;b++ ))
   do
   echo -n "❄"
   done

echo ""
done

②

#!/bin/bash

for ((i=1;i<=5;i++))
do
 for ((a=5;a>=$i;a--))
 do
 echo -n " "
 done
   for ((b=1;b<=7;b++ ))
   do
   echo -n "❄"
   done

echo ""
done

七、梯形

①直角梯形

#!/bin/bash

for ((i=1;i<=5;i++))
do
 for ((a=5;a>=$i;a--))
 do
 echo -n " "
 done
   for ((b=1;b<=7;b++))
   do
   echo -n "❄"
   done
     for ((c=1;c<=$i;c++))
     do
     echo -n "❄"
     done
echo ""
done

②等腰梯形

#!/bin/bash

for ((i=1;i<=5;i++))
do
 for ((a=5;a>=$i;a--))
 do
 echo -n " "
 done
   for ((b=1;b<=7+$i;b++))
   do
   echo -n "❄"
   done
     for ((c=1;c<=$i;c++))
     do
     echo -n "❄"
     done
echo ""
done

八、PATH变量

#!/bin/bash

OLDIFS=$IFS
IFS=':'

for a in $PATH
do
 echo $i

 for b in $a/*
 do
  if [ -x $b ];then
  echo $b
  fi
 done
done