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We are trying to allow a user that has not root permission to change the Time and Timezone. I've been reading and testing all day without results. I know that I can do that with sudo but I'm not an expert in the application. Can anybody help me telling me how can I do that?
sudo would require a password anyway. There is a simpler was... add a sticky bit to the program:
chmod 4777 `which date`
This will cause the app to be ran as the owner (in this case root), whoever executes it!
This is not good advice. There is almost never a good reason to create a world writable SUID file. Go the sudo route. The password that sudo prompts for is the user password you can keep root to yourself. If you really feel the need to get rid of the password prompt, there's always the NOPASSWD option.