How to Print a grid or matrix using Bash scripting

 To print a grid or matrix using the bash scripting, we  need to write loop within a loop. Which can be acheived using the below piece code.

Print 4X4 Grid:

#!/bin/bash
rows=4
columns=4
for ((i=0;i<$rows;i++))
do
    for ((j=0;j<$columns;j++))
    do  
        printf $j
    done
    printf "\n"
done

Output:

0123

0123

0123

0123

Bash matrix

Print a matrix using a single array:

#!/bin/bash

# We create an example array 'a' containing 16 values:
# array a = ( 0 1 2 3 4 ... 14 15 )
a=({0..15})

echo 'Linear array:'
echo ${a[*]}

# We now display this array 'a' in a 4x4 grid
echo 'Matrix array:'
for row in {1..4}; do
    for col in {1..4}; do
        echo -n ${a[((4*row+col-5))]}$'\t'
    done
    echo
done

Output:

Linear array:

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

Matrix array:

0       1       2       3

4       5       6       7

8       9       10      11

12      13      14      15

Bash_matrix_linear_array

Display "*" in a 4X4 Grid:

#!/bin/bash

# We now display this '*' in a 4x4 grid
echo 'Matrix array:'
for row in {1..4}; do
    for col in {1..4}; do
        echo -n *$'\t'
    done
    echo
done

Display_star_in_matrix

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