#!/bin/bash

# Handling arguments
while getopts "d:" opt; do
    case $opt in
        d)
            file_name=$OPTARG
            ;;
        *)
            echo "Usage: $0 -d <file_name>"
            exit 1
            ;;
    esac
done

if [ -z "$file_name" ] || [ ! -f "$file_name" ]; then
    echo "File not found or not specified. Usage: $0 -d <file_name>"
    exit 1
fi

# Reading a file and converting its contents into an array
mapfile -t numbers < <(tr ' ' '\n' < "$file_name")

# Number of elements
count=${#numbers[@]}
echo "Number of elements: $count"

# First 10 elements
first_ten=("${numbers[@]:0:10}")
echo "First 10 elements: ${first_ten[*]/,/, }"

# Last 10 elements
last_ten=("${numbers[@]: -10}")
echo "Last 10 elements: ${last_ten[*]/,/, }"