Special Characters
http://www.collados.org/asix1/m01/tu1/special_characters.html
VirtualBox/Shared Folders

https://help.ubuntu.com/community/VirtualBox/SharedFolders
VirtualBox/How to resize a Virtual Drive
https://forums.virtualbox.org/viewtopic.php?f=35&t=50661
https://www.virtualbox.org/manual/ch08.html#vboxmanage-modifyvdi
Enable Gnome Root Login
http://www.pathin.org/tutorials/debian-6-howto-enable-gnome-root-login-on-debian-6-squeeze/
Enable Sudo
https://www.digitalocean.com/community/tutorials/how-to-add-delete-and-grant-sudo-privileges-to-users-on-a-debian-vps
https://wiki.debian.org/sudo
http://www.pathin.org/tutorials/howto-enable-sudo-on-user-account-debian-6-squeeze/

Working with grep
https://www.howtoforge.com/tutorial/linux-grep-command/
Creating a bootable USB drive from an ISO image
https://www.turnkeylinux.org/blog/iso2usb
Answers to questions in some practical exercises
Practical exercise 4
Practical exercise 5a