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The unix file command uses a “magic” file database to determine which type of data a file contains, independently of the file’s name or extension.
I need to craft my custom magic database for testing purposes, but I fail to find how to create one.
You can
man magicfor a description for how to create your own magic file. Then usefile -C -m <your magic file>to compile it, andfile -m <your magic file>to use it.