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diff.%refers to the currently open filepath. Why is all this an argument to the:wcommand? Also, how does-get assigned to the contents of the working buffer? Is that automatic in vim, that the contents of the buffer (or maybe a specific range in the buffer) gets assigned to stdin for shell commands?:wbecause we're writing the file to the command (onstdin). In the command,-tells it to read fromstdin.:w !git diff % -for a colorized version, if you have git installed!fatal: bad flag '-' used after filenamewhen I run:w !git diff % -.