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poweroff

`poweroff` is a command-line instruction used to shut down a computer on Linux operating system. It will safely close all running applications, save all unsaved data, and shut down the computer. This is a command that must be executed before exiting the operating system and shutting down the computer.

Immediate shutdown (-i)

Immediate shutdown and power off (-h)

Immediate shutdown and power off (only works if system has this feature) (-H)

Immediate shutdown and disconnect power (only works if system has this feature) (-P)

Ignore filesystems on mounted points (-f)

Don't actually shutdown, just send warning message to all users (-w)

Delay shutdown by seconds (-d)

Don't execute init (-n)

Specify shutdown time instead of immediate shutdown (-t)

Examples

poweroff: Immediately shutdown and disconnect power.
poweroff -f: Forcefully shutdown all programs, and immediately shutdown and disconnect power.
poweroff -h: Immediately shutdown and power off.
poweroff -d 60: Shutdown the computer after a delay of 60 seconds.
poweroff -t 20:30: Shutdown the computer at 8:30 PM.
poweroff -f -n: Forcefully shutdown all programs, but don't execute init.
poweroff -w: Don't actually shutdown, just send warning message to all users.