2021-08-21

九九

#!/usr/bin/bash
for i in {1..9}
do
for b in {1..9}
do
if [ $i -ge $b ];then
 printf "%2s *%2s = %-2s " "$b" "$i" "$[$i * $b]"
 fi
 done
printf "\n"
done

画一个五角星

#!/usr/bin/bash
for ((i=1;i<=13;i=i+6))
      do
      for ((k=1;k<=13-$[(i+1) / 2];k++))
      do
      printf " "
      done
      for ((j=1;j<=i;j++))
        do
      printf "*"
       done
      printf "\n"
    done

    for ((i=23;i>=11;i=i-6))
      do
      for ((k=1;k<=13-$[(i+1) / 2];k++))
      do
      printf " "
      done
      for ((j=1;j<=i;j++))
        do
      printf "*"
       done
      printf "\n"
    done
  for ((i=5;i>=1;i=i-2))
      do
      for ((k=1;k<=1+$[(i+5) / 2];k++))
      do
      printf " "
      done
      for ((j=1;j<=i;j++))
        do
      printf "*"
       done
      for ((k=1;k<=18-$[3 * i];k++))
      do
      printf " "
      done
      for ((j=1;j<=i;j++))
        do
      printf "*"
       done
        printf "\n"
    done