How to Print Pyramid of Stars and Numbers using Bash scripting

 In this example, you will learn to print half pyramids, inverted pyramids, full pyramids, inverted full pyramids and Floyd's triangle in  Bash scripting.

Half Pyramid of  *

*
* *
* * *
* * * *
* * * * *

Script

#!/bin/bash
printf "Enter num of Rows:"
read rows
for ((i=1;i<=rows;i++))
   do
    for ((j=1;j<=i;j++))
     do
     printf "* "
     done
  printf "\n"
done

bash_half_pyramid

Half Pyramid of  0

Enter num of Rows:5
0 
0 0 
0 0 0 
0 0 0 0 
0 0 0 0 0 

Script

#!/bin/bash
printf "Enter num of Rows:"
read rows
for ((i=1;i<=rows;i++))
   do
    for ((j=1;j<=i;j++))
     do
     printf "0 "
     done
  printf "\n"
done

bash_half_pyramid-0

Half Pyramid of  numbers

Enter num of Rows:5
1 
1 2 
1 2 3 
1 2 3 4 
1 2 3 4 5 

Script

#!/bin/bash
printf "Enter num of Rows:"
read rows
num=1
for ((i=1;i<=rows;i++))
   do
    for ((j=1;j<=i;j++))
     do
     printf "$num "
     num=$((num + 1))
     done
     num=1
  printf "\n"
done

Half Pyramid of numbers Bash

Inverted Half Pyramid of  *

Enter num of Rows:5
* * * * * 
* * * * 
* * * 
* * 
* 

Script

#!/bin/bash
printf "Enter num of Rows:"
read rows
for ((i=rows;i>=1;i--))
   do
    for ((j=1;j<=i;j++))
     do
     printf "* "
     done
  printf "\n"
done

Inverted Half Pyramid of star

Full Pyramid of  *

Enter num of Rows:5
        * 
      * * * 
    * * * * * 
  * * * * * * * 
* * * * * * * * *  

Script

#!/bin/bash
printf "Enter num of Rows:"
read rows
for((i=1; i<=rows; i++))
do
  for((j=1; j<=rows - i; j++))
  do
    printf "  "
  done
  for((j=1; j<=2*i - 1; j++))
  do
    printf "* "
  done
  echo
done

Full Pyramid of star

Inverted Full Pyramid of  *

Enter num of Rows:5
* * * * * * * * * 
  * * * * * * * 
    * * * * * 
      * * * 
        * 

Script

#!/bin/bash
printf "Enter num of Rows:"
read rows
for((i=rows; i>=1; i--))
do
  for((j=1; j<=rows - i; j++))
  do
    printf "  "
  done
  for((j=1; j<=2*i - 1; j++))
  do
    printf "* "
  done
  echo
done

Inverted Full Pyramid of star

Floyd's Triangle

Enter num of Rows:10
1 
2 3 
4 5 6 
7 8 9 10 
11 12 13 14 15 
16 17 18 19 20 21 
22 23 24 25 26 27 28 
29 30 31 32 33 34 35 36 
37 38 39 40 41 42 43 44 45 
46 47 48 49 50 51 52 53 54 55 

Script

#!/bin/bash
printf "Enter num of Rows:"
read rows
num=1
for((i=1; i<=rows; i++))
do
  for((j=1; j<=i; j++))
  do
    echo -n "$num "
    num=$((num + 1))
  done
  echo
done

Floyds Triangle