Introduction Show
Sudo stands for SuperUser DO and is used to access restricted files and operations. By default, Linux restricts access to certain parts of the system preventing sensitive files from being compromised. The Prerequisites
SyntaxTo start using
When the
Options
Additional options can be found under the Note: Staying logged in as an administrator compromises security. In the past, admins would use su (substitute user) to temporarily switch to an administrator account. However, the su command requires a second user account and password, which isn’t always feasible. Granting sudo PrivilegesFor most modern Linux distributions, a user must be in the sudo, sudoers, or wheel group to use the We recommend to only grant privileges that are absolutely necessary for the user to perform daily tasks. The following sections explain how to add a user to the sudoers group. RedHat and CentOSIn Redhat/CentOS, the wheel group controls sudo users. Add a user to the wheel group with the following command:
Replace Debian and UbuntuIn Debian/Ubuntu, the sudo group controls sudo users. Add a user to the sudo group with the following command:
Replace Using visudo and the sudoers GroupIn some modern versions of Linux, users are added to the sudoers file to grant
privileges. This is done using the 1. Use the
2. This will open /etc/sudoers for editing. To add a user and grant full sudo privileges, add the following line:
3. Save and exit the file. Here’s a breakdown of the granted sudo privileges:
Note: It’s easier to simply add a user to the sudo or wheel group to grant sudo privileges. If you need to edit the configuration file, only do so using visudo. The visudo application prevents glitches, bugs, and misconfigurations that could break your operating system. Examples of sudo in LinuxBasic Sudo Usage1. Open a terminal window, and try the following command:
2. You should see an error message. You do not have the necessary permissions to run the command. 3. Try the same command with
4. Type your password when prompted. The system executes the command and updates the repositories. Run Command as a Different User1. To run a command as a different user, in the terminal, enter the following command:
2. The system should display your username. Next, run the following command:
3. Enter the password for Switch to Root UserThis command switches your command prompt to the BASH shell as a root user:
Your command line should change to:
The Execute Previous Commands with sudoThe Linux command line keeps a record of previously executed commands. These records can be accessed by pressing the up arrow. To repeat the last command with elevated privileges, use:
This also works with older commands. Specify the historical number as follows:
This example repeats the 6th entry in history with the To learn about how to efficiently use history command, check out our article on sudo history command with examples. Run Multiple Commands in One LineString multiple commands together, separated by a semicolon:
Add a String of Text to an Existing FileAdding a string of text to a file is often used to add the name of a software repository to the sources file, without opening the file for editing. Use the following syntax with echo, sudo and tee command:
For example:
Note: This would add the Nginx software repositories to your system. Conclusion You should now understand the Which of the following is a requirement for using storage spaces direct quizlet?Terms in this set (140) Which of the following is a requirement for using Storage Spaces Direct? A 10 GB Ethernet network interface with remote-direct memory access (RDMA) support is a must.
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Which of the following are types of containers that can be used in Windows Server 2016?Windows Server 2016 supports two types of Containers namely Windows Server Container and Hyper-V Container. They differ mainly in the degree of isolation they provide. Windows Server Container uses process and namespace isolation technology to isolate applications.
Which registry root key should Lucida access to change the font size?Which Registry root key should Lucida access to change the font size? Lucida can change the font size by accessing the HKEY_CURRENT_USER key. This key contains data on color combinations, font sizes and type, the keyboard layout, the taskbar, clock configuration, and other profile settings for the current user.
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