grep is a tool that searches for the specified string (really a regex) over all files and subdirectories. I dont know what the equivalent on windows is, but I'm sure there is one.
And note that the actual source code for the vast majority of plugins is not in builtins.py, most of the stuff in builtins.py are stubs used to load the actual code. The exception is the builtin file type plugins like txt2txtz.
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