On startup, the Mathematica kernel does the following:
Perform license management operations. Run Mathematica commands specified in any -runfirst options passed to the kernel executable. Run Mathematica commands specified in any -run options passed to the kernel executable. Run the Mathematica commands in the user-specific or special location file init.m. Run the Mathematica commands in the site-wide or central location file init.m. Load init.m and Kernel/init.m files in Autoload directories. Begin running the main loop.
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