change working env: targets

Question 1

A target unit’s main purpose is to synchronize
with the other units on a computer when it boots up,
or when it is instructed to change states.
The most common use for a target
is to get the system into a new state,

Answer 1

target

Question 2

show all unit files for available targets

Answer 2

systemctl list-unit-files -t

Question 3

show all loaded and active unit files

Answer 3

systemctl list-unit -t

Question 4

list out default target

Answer 4

systemctl get-default

Question 5

change default target to a different target

Answer 5

systemctl set-default

Question 6

will change the running state of the system from current target to a different target

Answer 6

systemctl isolate <target></target>

Question 7

almost identical to the System V Init sing-user mode and allows the root user to repair a system

Answer 7

systemctl rescue

Question 8

will run the reboot.target that is the same as typing reboot at the cmd prompt

Answer 8

systemctl reboot

Question 9

perform a complete shutdown of the system by isolating the system to the poweroff.target - same thing as typing poweroff at cmd prompt

Answer 9

systemctl poweroff