Is Linux/Unix based OS adoption for development (or recreation) a rough measure of the awareness, adaptability and/or skill of a developer, after considering factors like learning curve for effective code testing via the CLI, basic scripting, tweaking, etc.
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In general, I would not use a crude measure like if they Unix to judge the skill of a developer. I personally use Linux for development and would not like to trade this for Windows. This has primarily to do with the workspaces, package management system, and that Linux is more transparent about its guts. However, a sizeable portion of the dev community uses windows because of C# and Visual Studio, and I do not think those devs are less skillfull than Linux devs. In addition, an IDE like eclipse runs on both Unix and Windows, making the development environment quite similar between Windows and Unix. Finally, a large part of the skill of a dev comes from the thoughtprocess and design skills of the dev. These are OS independent.
In conclusion, I think there is no clear relation between the skill of a dev and the choice in OS.