what is use of boot -a

Answer Posted / rakesh

The kernel initializes itself and begins loading modules,
reading the files with the ufsboot program until it has
loaded enough modules to mount the root filesystem itself.
At that point, ufsboot is unmapped and the kernel uses its
own drivers. If the system complains about not being able
to write to the root filesystem, it is stuck in this part
of the boot process.

The boot -a command singlesteps through this portion of the
boot process. This can be a useful diagnostic procedure if
the kernel is not loading properly.
/etc/system: The /etc/system file is read by the kernel,
and the system parameters are set.

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