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Did you try to run that command in a console terminal to see what happens, before binding it to a key?
Do you run shutdown with appropriate privileges?
The manual says the time argument is mandatory (try "shutdown now", or "halt").
I don't think I'm doing it right, as it is still asking for a password.
When I add what you say, it just says it has a syntax error, I'm adding it to the last line (27).
I tried to bypass the password for all commands, but it doesn't seem to be working, but it doesn't say my syntax is wrong.
What's broken here?
# This file MUST be edited with the 'visudo' command as root.
# See the man page for details on how to write a sudoers file.
# Host alias specification
# User alias specification
# Cmnd alias specification
# User privilege specification
root ALL=(ALL) ALL
sawducum ALL=(ALL) ALL
# Allow members of group sudo to execute any command
# (Note that later entries override this, so you might need to move
# it further down)
%sudo ALL=(ALL) ALL
# Members of the admin group may gain root privileges
%admin ALL=(ALL) ALL
%sawducum ALL=(ALL) ALL