53

I have desktop edition of Ubuntu.

I like the Terminal so that that I prefer to shutdown my computer with the shutdown command.

However when I type shutdown now it prompts me to enter my password.Is there any way I can shutdown my computer using this command without entering my password?

  • 4
    Does anyone know what command is executed when I click "shutdown" in Desktop Environment? – kubahaha Feb 20 '15 at 17:15
  • For me both poweroff and shutdown now works from terminal. In Ubuntu 20,04, but I an sure that it has been like that for years. – Soren A Apr 29 at 22:00
57

Open up a terminal (CTRL + T) and type the following sudo visudo

Add the following line:

%group_name ALL=(ALL) NOPASSWD: /sbin/poweroff, /sbin/reboot, /sbin/shutdown

or

user_name ALL=(ALL) NOPASSWD: /sbin/poweroff, /sbin/reboot, /sbin/shutdown

This allows the user/group to run the above three commands, using sudo, however with no password.

So, sudo poweroff will now result in a passwordless shutdown.


However, to make this even cleaner, we'll add an alias, so that running shutdown calls sudo shutdown now.

Open ~/.bash_aliases for editing.

nano ~/.bash_aliases

Insert the following line at the end of the file:

alias shutdown='sudo shutdown now' 

Finally, load the changes to the .bash_aliases file...

source ~/.bash_aliases

Try it out!

shutdown

Thanks, Eric.

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38

A safe way to do this without using sudo and without tinkering with the system, is by executing these one-liner commands:

For Ubuntu 14.10 or earlier:

Shutdown:

/usr/bin/dbus-send --system --print-reply --dest="org.freedesktop.ConsoleKit" /org/freedesktop/ConsoleKit/Manager org.freedesktop.ConsoleKit.Manager.Stop

Restart:

/usr/bin/dbus-send --system --print-reply --dest="org.freedesktop.ConsoleKit" /org/freedesktop/ConsoleKit/Manager org.freedesktop.ConsoleKit.Manager.Restart

consolekit Install consolekit should of course be installed your system.

Other commands you may like:

Suspend:

/usr/bin/dbus-send --system --print-reply --dest="org.freedesktop.UPower" /org/freedesktop/UPower org.freedesktop.UPower.Suspend

Hibernate: (if enabled on your system)

/usr/bin/dbus-send --system --print-reply --dest="org.freedesktop.UPower" /org/freedesktop/UPower org.freedesktop.UPower.Hibernate


For Ubuntu 15.04 and later:

(This is due to Ubuntu's shift in using systemd instead of Upstart)

systemctl poweroff

systemctl reboot

systemctl suspend

systemctl hibernate

systemctl hybrid-sleep

Since hibernate is normally disabled by default in Ubuntu systems, you can enable this by checking this answer: https://askubuntu.com/a/617254/101985

Original source: https://bbs.archlinux.org/viewtopic.php?id=127962

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  • This is a useful reference, however the systemctl command requires to input the user's password, so it is not applicable as a direct answer to the question. – Andrea Lazzarotto Aug 17 at 12:48
3

unity uses many gnome services, and in that case too - you can shutdown gnome way.

gnome-session-quit --power-off --force --no-prompt

will do the job.

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  • Looks like this only works for logout. From man page of --no-prompt: End the session without user interaction. This only works with --logout. – Pylinux Nov 2 '19 at 21:41
1

While you can use the method of allowing NOPASSWD on /usr/sbin/shutdown, although another, DE-independent solution is to just use init 0.

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0

that is easy. using -S option like this:

echo <your-password> | sudo -S poweroff
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0

On Ubuntu 20.04 LTS, I created a polkit file with

echo "[Shutdown or suspend without a password]
Identity=unix-user:$USER
Action=org.freedesktop.login1.set-wall-message;org.freedesktop.login1.halt;org.freedesktop.login1.suspend
ResultAny=yes
" | sudo tee /etc/polkit-1/localauthority/50-local.d/allow_shutdown_suspend.pkla

With this, systemctl halt and systemctl suspend work without a password. This also work remotely with e.g. ssh 192.168.0.55 -t 'systemctl suspend'.

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