Installing Eclipse CDT and build-essentials to offline Ubuntu

On my offline Ubuntu I use Eclipse C++ (CDT) and build-essentials to build C++ projects. To install Eclipse C++ (CDT) and build-essentials to offline Ubuntu:

1. Download Linux version of Eclipse C++, copy to offline Ubuntu and extract. You can directly run eclipse without any further installation, but you need to finish the following steps to build a C++ project.
2. On your Windows PC that is connected to the internet, install a virtualizer like VirtualBox  and install Ubuntu Desktop 22.04 as virtual machine.
3. Enable Windows - Ubuntu file sharing.
4. Use the following shell script to download build_essentials on your online PCs Ubuntu virtual machine and its dependencies. You can copy these downloads to your offline Ubuntu and install them following the steps written as comments down below:

	#!/bin/bash
	#1.On online Ubuntu 22.04, create a folder, save this script as download_build_essential.sh
	#2.Make script executable with chmod +x download_build_essential.sh
	#3.Run script with ./download_build_essential.sh
	#4.Copy downladed .deb files (~76MB) to the offline Ubuntu 22.04
	#5.On offline Ubuntu, run sudo dpkg -i *.deb
	#6.Verify installation with make --version
	# Function to download a package and its dependencies
	download_package() {
	package=$1
	# Check if the package has already been processed
	if grep -Fxq "$package" downloaded_packages.txt
	then
	echo "Already downloaded: $package"
	return
	else
	echo "$package" >> downloaded_packages.txt
	fi
	echo "Downloading $package..."
	apt-get download $package
	for dep in $(apt-cache depends $package | grep Depends: | sed "s/ Depends://"); do
	# Avoid downloading virtual packages
	if apt-cache show $dep > /dev/null 2>&1; then
	download_package $dep
	fi
	done
	}
	# Main package to download
	main_package="build-essential"
	# Update package lists
	echo "Updating package lists..."
	sudo apt-get update
	# Create a directory for downloads
	download_dir=$main_package
	mkdir -p $download_dir
	cd $download_dir
	# File to keep track of downloaded packages
	touch downloaded_packages.txt
	# Download main package and dependencies
	download_package $main_package
	echo "Download completed. Files saved in $download_dir."

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