Physics grad student, but mainly the kind that tightens screws, and only occasionally the kind that has to figure out how to fix a computer. I've been using linux/unix for a longish time, but never intensively, so I mostly have no idea what I'm doing, and that frequently leads me to the land of stackoverflow.
In the coding department, I use mainly Python and MATLAB, but I also know small bits and pieces of php, sql, c, c++, java, and a couple of others.