Mr. Wiener is an independent education policy consultant. From 2002 to 2009, he was the policy director for the Education Trust, an advocacy group focused on low-income students and students of color.

bash_unit allows you to write unit tests (functions starting with test), run them and, in case of failure, displays the stack trace with source file and line number indications to locate the problem.

Think back to the last time you jotted down a quick note or made a grocery list. Chances are, it wasn’t with pen and paper. Over the past decade, keyboards and screens have quietly replaced ...