Reading binary (MACH-O) file load commands [closed]

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How does otool and similar tools read load commands? I could not find any open source tools to figure this out (even though otool is partially open source). How does it parse the binary file? Where does it start?

Thanks

Answer 1

I would expect that the otool command would open the file and parse the header of the binary according to the OSX ABI Mach-O File Format