In this tutorial, created using Jekyll (alembic theme) and Kramdown Flavored Markdown, code blocks display commands necessary to complete the tutorial. Some sections are marked as optional and can be skipped.
A code block will look like this:
sudo apt-get install tree cd ~ # comment tree -I workspace/tools
All lines contained within the highlighted boxes will need to be executed at the command line (or occasionally at an R command prompt). When copy/paste is used be sure to hit Return or Enter after pasting each command or set of commands. All lines starting with a ‘#’ are comments and will not be interpretted by the shell/R session.