Which Language Do I Need to Know for Making a Linux Tool?

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Which language do I need to know for making a Linux tool?

Not a specific language. It’s often the actual code that decides how shit is supposed to look. For example, in Windows Forms software C# is used both for the business code as well as for the code that is actually rendering the forms. For basic Win32 GUI apps the C++ code decides for the most part how shit looks, while the active theme (which is probably some C++ code itself) does all the details. So basically not a specific styling language. Just good ol’ code. Varying UI frameworks might have their own styling languages, and then there’s Electron (which VS Code, for example, uses) which uses actual CSS for the styling.

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There are even more languages that are not strictly UI frameworks.   As a UI designer it really helps to look at the design of other peoples’ use of their platform, and understand what they’re doing when they’re not using the GUI design, for example (there’s more than just CSS in the web these days). With VS Code’s UI framework you can do this directly, or with a nice browser inspection of the UI that helps you to make the most out of what it’s doing, such as by using your own design patterns. VS Code includes all the stuff you need from a visual designer including CSS preprocessors like Sass (or Less), linting, and a ton of other things. There are tons of great tooling tools like HTML Inspector, Clint, etc.