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Semirandom question: what's the proper file extension for a YAML file?

I've done informal polls on it and every time it's an even split between .yaml and .yml

There are plenty of file formats that have multiple extensions in common use. I can think of a few off the top of my head:

- .jpg / .jpeg

- .tif / .tiff

- .htm / .html

- .cpp / .cxx

It's frustrating at times, but not all file formats have One True Extension.

C++ is the worst offender: .cpp, .cxx, .cc, .h, .hpp, .hh, etc.

I've even seen .c++/.h++ in the wild at least once.

Could be worse, could be uppercase .C/.H…

Most of these are Microsoft's fault: MS-DOS allows only 3 characters for the file extension, so the file extensions had to be abbreviated.

As for C++, I'd also blame Microsoft. The plus character (+) is a reserved character for MS-DOS, so the obvious extension ".c++" couldn't be used (nor could the case-sensitive ".C" extension). So people either toppled their plus signs (".c++" becomes ".cxx"), or replaced them by the first letter of "plus" (".c++" becomes ".cpp"), or treated them as a repetition sign (".c++" becomes ".cc").

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