In this specific case only, since the /sys/class/rtc/rtc0/wakealarm file only controls the wake-up alarm for the system and is otherwise harmless, another alternative to avoid the password is either to take ownership of that file with chown (if you are the only user setting the alarm), or make it world-writeable with chmod +666 in that case, simply remove the sudo from your Python call, leaving sh -c "." intact. Now your script should run without requiring a password AND without compromising the security of your account, your data or your system!Īlternative only for wakealarm (not for general use!): Os.system('sudo /home/username/pydatertc.sh') Modify your python script to call pydatertc.sh If you want to use sudo su - user without a password, you should (if you have the privileges) do the following on you sudoers file: ALL NOPASSWD: /bin/su - where: is you username :D (saumun89, i.e.Username ALL=(ALL) NOPASSWD: /home/username/pydatertc.sh Below that line, insert the following line, where username is your username:.Around line 25, you'll see this line: %sudo ALL=(ALL:ALL) ALL.Type sudo visudo at the terminal to open the sudo permissions ( sudoers) file.Set up sudo to allow pydatertc.sh to execute without requiring a password Sudo chmod 700 /home/username/pydatertc.sh Sudo chown root:root /home/username/pydatertc.sh Quit the editor, and from the terminal, make the script executable and change its ownership to root, otherwise another user with access to your system could possibly edit it and execute whatever commands they want as root without needing your password:.your home directory:Įcho date \'+%s\' -d \'+ 24 hours\' > /sys/class/rtc/rtc0/wakealarm Insert only this line, and save it to, e.g.Open up gedit (or your favorite editor), and create the script e.g. How can users have root (administrative) privileges in Linux, Unix without knowing the root password One of the best answers to this question is sudo.Create a shell script with just that command > rtc., is allowed to run WITHOUT needing the password. The correct way to do it to setup sudo such that only the one specific command you need, i.e. You can do that by changing the /etc/sudoers file via the sudo visudo editor.Please note: Any method which involves putting your login password in plain text, in a command or in a file, is insecure and should NOT be used! Since disabling passwords for commands that require sudo is not recommended, you may want to apply that to only a specific command. How to Run the sudo Commands Without Entering a Password on Ubuntu 20.04? If the sudoers file is currently being edited you will receive a message to try again later. visudo locks the sudoers file against multiple simultaneous edits, provides basic sanity checks, and checks for parse errors. Visudo edits the sudoers file in a safe fashion, analogous to vipw(8). If you create any other users at a later point, you can use the sudo visudo command to add them to the sudoers group. If you install your Ubuntu 20.04 system or any previous version for the first time, you'll have a default user with an account of type administrator which can execute sudo. The file is composed of aliases (basically variables) and user specifications (which control who can run what). The /etc/sudoers file controls who can run what commands as what users on what machines and can also control special things such as whether you need a password for particular commands. Not all Ubuntu users can use sudo to execute commands as root or as another user but onlu users thatĪccording to the official Ubuntu website: The sudo command is used to run a command with elevated privileges, in most times as root but it can also be used to run commands as some other user, not necessarily a root user or super user. It originally stood for "superuser do" as the older versions of sudo were designed to run commands only as the superuser. Sudo is a program for Unix-like computer operating systems that allows users to run programs with the security privileges of another user, by default the superuser. We'll see how to configure sudo with no password for all commands in your system and also for specific commands. While this is convenient if you need to avoid repeating your password for sudo access each time, it's also not recommended in most cases because of security reasons. This will prevent Ubuntu 20.04 from prompting to enter a password each time you execute a command that requires sudo. In this article, you'll see how to configure and run sudo without a password on your Ubuntu 20.04 password.
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