bash

For many years I have been yearning to have a single operating system that I run for all my work and leisure needs, but I have always had to run Linux for my software development related tasks, and Microsoft Windows for general usage. Linux works well for me when doing programming work due to the powerfull bash shell, the Linux command line utilities (like git, grep, cat, etc) and how well they integrate with the shell and a host of development tools that just works so naturally in Linux, like python and node.