Identify three differences between the shutdown and init commands.
A.
init shuts a system down faster than the shutdown command.
B.
Only shutdown broadcasts a final shutdown warning to all fogged in users.
C.
init does not terminate all services normally. The shutdown command performs a t shutdown of
all services.
D.
The shutdown command can only bring the system to the single-user milestone. The command
must be used to shut the system down to run level 0.
E.
The shutdown sends a shutdown message to any systems that are mounting resource-tern that
is being shut down.
F.
The shutdown command will shut the system down and turn off power; init will only shut system
down.
Explanation:
Note shutdown:
Shutdown is executed by the super user to change the state of the machine. In most cases, it is
used to change from the multi-user state (state 2) to another state.
By default, shutdown brings the system to a state where only the console has access to the
operating system. This state is called single-user.
Before starting to shut down daemons and killing processes, shutdown sends a warning message
and, by default, a final message asking for confirmation. message is a string that is sent out
following the standard warning message “The system will be shut down in …” If the string contains
more than one word, it should be contained within single (‘) or double
(“) quotation marks.
Note init:
If a 0 through 6 is entered, init enters the corresponding run level. Run levels 0, 5, and 6 are
reserved states for shutting the system down. Run levels 2, 3, and 4 are available as multi-user
operating states.
OPTIONS
0 Go into firmware.
5 Shut the machine down so that it is safe to remove the power. Have the machine remove power,
if possible.
6 Stop the operating system and reboot to the state defined by the initdefault entry in /etc/inittab.
Reference: man init, man shutdown
ABE