Write a script to sort a given number in ascending or descending order

#!/bin/bash
<<doc
Name: Adarsh Rai
date: 23-09-2023
Description: Write a script to sort a given number in ascending or descending order
Sample Input: ./sorting.sh -a 5 4 6 2 3 8 9 7 1
Sample Output:
Ascending order of array is 1 2 3 4 5 6 7 8 9
doc

#!/bin/bash

# Check if there are command line arguments
if [ $# -gt 0 ]
then
    # Store command line arguments in an array
    array=($@)

    # Check the first argument using a case statement
    case ${array[0]} in

        -a)
            # Sort in ascending order using bubble sort algorithm
            length=${#array[@]}
            for i in `seq 1 $(($length - 1))`
            do
                for j in `seq 1 $(($length - 2))`
                do
                    # Compare and swap elements if necessary
                    if [ ${array[$j]} -gt "${array[$(($j+1))]}" ]
                    then
                        temp=${array[$j]}
                        array[$j]=${array[$(($j+1))]}
                        array[$(($j+1))]=$temp
                    fi
                done
            done
            length=${#array[@]}

            # Print the ascending order of the array (excluding the first element)
            echo "ascending order of array is ${array[@]:1:$(($length - 1))}"
            ;;

        -d)
            # Sort in descending order using bubble sort algorithm
            length=${#array[@]}
            for i in `seq 1 $(($length - 1))`
            do
                for j in `seq 1 $(($length - 2))`
                do
                    # Compare and swap elements if necessary
                    if [ ${array[$j]} -lt "${array[$(($j+1))]}" ]
                    then
                        temp=${array[$j]}
                        array[$j]=${array[$(($j+1))]}
                        array[$(($j+1))]=$temp
                    fi
                done
            done
            length=${#array[@]}

            # Print the descending order of the array (excluding the first element)
            echo "descending order of array is ${array[@]:1:$(($length - 1))}"
            ;;

        *)
            # Display an error message for invalid input
            echo "ERROR : Please pass the choice.
Usage : ./sorting -a/-d 4 23 5 6 3"
            ;;
    esac
else
    # Display an error message for missing command line arguments
    echo "Error : Please pass the argument through command line.
Usage : ./sorting -a/-d 4 23 5 6 3"
fi