it is nice that you added a snapshot part

Thank you, in case of errors you can give it a clean start. Should also work on platforms other than Virtualbox.

Sander sometimes assumes changes made in previous chapters, sometimes he doesn't. IMHO a candidate RHCSA should be able to make a small script or flip back a few pages, to get on the same page were Sander assumes you are.

heading should be Install Dependencies not install Vagrant because we are install both vagrant and virtualization hypervisors either kvm or virtualbox & the section above it in README.md should be called Dependencies.

Agree, see 373c8c7. Current Vagrantfile assumes Virtualbox, KVM hasn't been implemented yet.

we can reduce the lines by put package names in one command:
sudo apt-get install git dkms virtualbox-5.1

Like 8058808?

@smartbit I think we can organize it better

# Generate SSH key to use when accessing machies
ssh-keygen -t rsa -b 4096 -N "" -C "root@example.com" -f ~/.ssh/rhce # empty password

# Make adding SSH key load to ssh agent automatic
eval $(ssh-agent); echo $'eval $(ssh-agent)' >> ~/.profile
ssh-add ~/.ssh/rhce; echo $'ssh-add ~/.ssh/rhce' >> ~/.profile

# Add Virtualbox GPG Key & repository
wget -q -O - http://download.virtualbox.org/virtualbox/debian/oracle_vbox_2016.asc | sudo apt-key add -
sudo sh -c 'echo "deb http://download.virtualbox.org/virtualbox/debian `lsb_release -sc` non-free contrib" > /etc/apt/sources.list.d/virtualbox.org.list'

# TODO remove linestarve.com and use alternative method to get latest version of vagrant
# Add a repository to download vagrant
sudo bash -c 'echo deb http://vagrant-deb.linestarve.com/ any main > /etc/apt/sources.list.d/wolfgang42-vagrant.list'
sudo apt-key adv --keyserver pgp.mit.edu --recv-key AD319E0F7CFFA38B4D9F6E55CE3F3DE92099F7A4

# Update packages list
sudo apt update

# TODO remove virtualbox version-number and automatically install latest version; dkms needed when upgrading kernel
# Install packages
sudo apt -y --force-yes install virtualbox-5.1 git vagrant # virtualbox-ext-pack dkms

# Download (clone) lab environment from GitHub
cd ~
git clone https://github.com/AnwarYagoub/RHCSA-RHCE-Lab-Environment.git
cd ~/RHCSA-RHCE-Lab-Environment

more comment is (almost) always better. Please push to the branch update_readme

Ok I will pull the latest changes and add comments.

Why using --force-yes man page for this command says:

--force-yes
           Force yes; this is a dangerous option that will cause apt to continue without prompting if it is doing something potentially harmful.
           It should not be used except in very special situations. Using force-yes can potentially destroy your system! Configuration Item:
           APT::Get::force-yes. This is deprecated and replaced by --allow-downgrades, --allow-remove-essential, --allow-change-held-packages in
           1.1.

saw it, the --allow* descriptions and which to choose wasn't easy to find. Please suggest one.

Do we really need to force installing packages I can see why we need it !!

Probably not, now removed

This will make installing vagrant easy 👍

@smartbit
why two exports with the same variable name virtualbox_version ?
the last one will override the first.

I was studying regex, sed & awk and came up with several alternatives. The other.md files have similar pairs and in c6bcfb3 you'll find even more alternatives.

What do you think, should we depend on the output order of yum & html pages, or should awk do the sorting? Any other suggestions, enhancements, questions, etc?

Ubuntu.md currently has three steps for installing vagrant:

1. download the .deb file
2. install it apt install ./vagrant_"$vagrant_version"_x86_64.deb
3. delete it rm ./vagrant_"$vagrant_version"_x86_64.deb

whereas in CentOS/Fedora it is a simple yum install https://...._x86_64.rpm. Do you know how to put the .deb-url on the apt install command-line directly?

What do you think, should we depend on the output order of yum & html pages, or should awk do the sorting? Any other suggestions, enhancements, questions, etc?

I mean when a user sees theses two command he/she may apply both of them. so why to put two of them if one can handle it properly

Ubuntu.md currently has three steps for installing vagrant:

download the .deb file
install it apt install ./vagrant_"$vagrant_version"x86_64.deb
delete it rm ./vagrant"$vagrant_version"_x86_64.deb

whereas in CentOS/Fedora it is a simple yum install https://...._x86_64.rpm. Do you know how to put the .deb-url on the apt install command-line directly?

If we want to install .deb we should use dpkg with -i option or any other alternative apt-get used to install packages from repositories unlike yum which can handle install a local package.

so why to put two of them if one can handle it properly

Because I didn't come to a conclusion which of the two (three) is better. What are your thoughts? After we made up our mind, we remove the other and have a reference left in the repository.

we should use dpkg with -i

Like this? It would put vagrant install on a single line, but then we'd have 2 lines for installing: dpkg for vagrant & apt install for git & virtualbox.
That would give 2 options 1) apt install & dpkg -i 2) download, apt install, rm. Which do you prefer?