What is the purpose of using sudo?
The sudo command is used to give such permissions to any particular command that a user wants to execute once the user enters a user password to give system based permissions.
What happens when you run sudo?
It runs whatever command you want to run as an administrator. It’s often used to give you the privilege to edit system files (like /etc/hosts ) or to add directories to system directories and so on.
What does the sudo authentication file control?
sudo determines who is an authorized user by consulting the file /etc/sudoers. By running sudo with the -v option, a user can update the time stamp without running a command . The -a (authentication type) option causes sudo to use the specified authentication type when validating the user, as allowed by /etc/login.
What sudoers file means?
The sudoers file is a file Linux and Unix administrators use to allocate system rights to system users. This allows the administrator to control who does what. When you want to run a command that requires root rights, Linux checks your username against the sudoers file. This happens when you type the command “sudo”.
What security goals does sudo help an administrator achieve?
sudo has a specific purpose: It allows authorized users to escalate their current privileges in a controlled way. The practical impact of that depends on how you are using privileges in your system. Typically, users don’t use privileges to silo their data, so sudo doesn’t protect that data.
Why is sudo more secure?
The consensus among many Unix and Linux users seems to be that sudo is more secure than using the root account, because it requires you type your password to perform potentially harmful actions. The concept behind sudo is to give non-root users access to perform specific tasks without giving away the root password.
Can root user do anything?
The root account has root privileges. This means it can read and write any files on the system, perform operations as any user, change system configuration, install and remove software, and upgrade the operating system and/or firmware. In essence, it can do pretty much anything on the system.
How can I sudo without password?
Enable sudo without password in Ubuntu/Debian
- Open the /etc/sudoers file (as root , of course!) by running: sudo visudo.
- At the end of the /etc/sudoers file add this line: username ALL=(ALL) NOPASSWD:ALL.
- Finally, open a new terminal window and run a command that requires root privileges, such as sudo apt-get update .
Who can edit sudoers?
Sudoers must be edited by running visudo in Terminal, like so:
- sudo visudo.
- Defaults timestamp_timeout=0.
- root ALL=(ALL) ALL.
- username hostlist = (userlist) commandlist.
- alexander ALL=(ALL) ALL.
- alexander ALL=(ALL) /usr/bin/apt-get update.
- \%admin ALL=(ALL) ALL.
- sudo update-alternatives –config editor.