Merge branch 'master' of github.com:dukeatlas/reu-docs

docs/programming.rst

@@ -1,5 +1,13 @@
-Programming in C++ and Python
-=============================
+UNIX Shell, C++, and Python
+===========================
+
+The `UNIX shell <https://en.wikipedia.org/wiki/Unix_shell>`_ is going
+to become your best friend. You should really learn how to use it
+effectively. The defaut shell on most Linux distributions is ``bash``
+(this is the default on macOS as well). Check out `this tutorial
+<https://swcarpentry.github.io/shell-novice/>`_. There are also many
+videos online to walk you through a lot of basics; `this one
+<https://www.youtube.com/watch?v=oxuRxtrO2Ag>`_ is pretty thorough.
 
 The main programming languages used in HEP are C++ and Python. There
 are *infinite* resources online for learning these programming