How can I modify the power button behaviour?

Question

I want the PC to shut down without any dialogue, but let time for the applications to close properly.

One solution is, to change powerbtn.sh to: shutdown -h now but that does not wait for all applications to close.

Answer 1

gsettings set org.gnome.settings-daemon.plugins.power button-power shutdown

will change your the behaviour of the power button of your system from interactive (default) to immediate normal shutdown.

The command is gsettings set org.gnome.settings-daemon.plugins.power button-power <option>

Available options are:

• Blank: does nothing
• Suspend: makes your system suspend
• Shutdown: starts a normal issued shutdown procedure
• Hibernate: hibernates your system
• Nothing: does nothing
• Log out: log your user out

Answer 2

To do it GUI:

Install dconf-tools:

sudo apt-get install dconf-tools

open dconf-editor from dash or just run dconf-editor & in terminal

Navigate to org.gnome.settings-daemon.plugins.power and set your default button-power action there:

replace suspend by shutdown.