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In linux /boot, we have the Linux kernel and boot loader files. I wonder whether there is an equivalent of Linux /boot directory in an Mac OS?

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Not as a single location; the analogous files are in a number of different filesystem locations:

  • The boot loader is /System/Library/CoreServices/boot.efi on Intel Macs. If you have one of the old PowerPC Macs (and an old enough version of OS X), that'd use /System/Library/CoreServices/BootX.

  • The kernel is /System/Library/Kernels/kernel in Yosemite (version 10.10), but was just /mach_kernel in older versions.

  • Apple-supplied loadable kernel modules (known as kernel extensions or kexts) are found in /System/Library/Extensions/, and third-party extensions in /Library/Extensions/.

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