This article describes how to install LibreOffice 4.0 on Debian-based / Ubuntu-based Linux distributions, such as Linux Mint, Xubuntu, Kubuntu, Debian and Ubuntu. This installation method is based on the official .deb packages.
This how-to is about installing VirtualBox on CentOS 6.2. Provided instructions should also work on Scientific Linux and Red Hat Enterprise Linux (RHEL).
This short howto is about setting up sudo on Red Hat Entreprise Linux and its derivates CentOS and Scientific Linux. It also gives a quick introduction on using the vi text editor through visudo.
This howto explains how to change the default program to open all files with a given extension on Linux Mint and Ubuntu. It also details how to change the default application for a batch of filetypes, for example all audio files or all video files.