九九乘法表

方法一：

#!/bin/bash
a=1
while [ $a -le 9 ]
do
  b=1
  while [ $b -le $a ]
  do
     c=$[$a*$b]
     echo -e -n "$a*$b=$c\t"
     let b++
  done
let a++
echo ""
done

方法二：

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

横线

for((a=1;a<=8;a++))
do
  echo  -n "*"
done

竖线

#!/bin/bash

for((a=1;a<=8;a++))
do
  echo  "*"
done

矩形

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

直角三角形

方法一：

#!/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

方法二：

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

等腰三角形

#!/bin/bash
for((i=1;$i<=10;i++))

do
  for((j=10;j>=$i;j--))
  do
    echo -n " "
  done
  for((k=1;k<=$[$i*2-1];k++))
  do
   echo -e -n "*"
   done
echo ""
done

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

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

倒等腰三角形

#!/bin/bash
for((a=1;a<=10;a++))
do
  for((b=2;b<=$a;b++))
  do
    echo -n " "
  done
  for((c=10;c>=$a;c--))
  do
    echo -n "*"
  done
  for((d=9;d>=$a;d--))
  do
    echo -n "*"
  done

echo ""
done

菱形

#!/bin/bash
for((i=1;$i<=9;i++))
do
  for((j=9;j>=$i;j--))
  do
    echo -n " "
  done
  for((k=1;k<=$[$i*2-1];k++))
  do
    echo -e -n "*"
  done
echo ""
done

for((a=1;a<=10;a++))
do
  for((b=2;b<=$a;b++))
  do
    echo -n " "
  done
  for((c=10;c>=$a;c--))
  do
    echo -n "*"
  done
  for((d=9;d>=$a;d--))
  do
    echo -n "*"
  done

echo ""
done

平行四边形

#!/bin/bash
for((a=1;$a<=8;a++))
do
  for((b=1;$b<=$a;b++))
  do
    echo -n " "
  done
  for((c=1;$c<=8;c++))
  do
    echo -n "*"
  done
echo ""
done

#!/bin/bash
for((a=1;$a<=8;a++))
do
  for((b=8;$b>=$a;b--))
  do
    echo -n " "
    done
  for((c=1;$c<=8;c++))
  do
    echo -n "*"
  done
echo ""
done

直角梯形

#!/bin/bash
for((a=1;$a<=8;a++))
do
  for((b=8;$b>=$a;b--))
  do
     echo -n " "
  done
  for((c=1;$c<=8+$a;c++))
  do
     echo -n "*"
  done
echo ""
done

等腰梯形

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