In future posts, we'll look at how sudo can be used to provide more fine-grained options for controlling sudo privileges. > /etc/sudoers: syntax error near line 3 > /etc/sudoers: syntax error near line 3 <<< The sudo command temporarily elevates privileges allowing users to complete sensitive tasks without logging in as the root user. By default, Linux restricts access to certain parts of the system preventing sensitive files from being compromised. Fortunately, there are some ways around this that don't involve a lot of work, and the visudo command provides some details on the problems needing to be fixed. Sudo stands for SuperUser DO and is used to access restricted files and operations. We would like to create a new partition, so we press n. To create a new partition on the empty disk, we will provide it as an argument to gdisk : sudo gdisk /dev/sdX The gdisk utility awaits our commands. password for 5: Fixing a corrupt /etc/sudoers fileĪ corrupt /etc/sudoers file can keep sudo from working and really mess up your day. sudo fdisk -l Find your device name in the fdisk output In our example, the disk drive has been assigned the /dev/sdb device path. ![]() Extra care should always be taken when using the root account in this way. With a default /etc/sudoers configuration and membership in the sudo (or admin) group, you can assume root control using the command sudo su. There are times when prefacing every command with "sudo" gets in the way of getting your work done. Press to keep the current choice, or type selection number: There are 3 choices for the alternative editor (providing /usr/bin/editor). $ sudo update-alternatives -config editor When you run a command with sudo, you must enter. This command will display a list of editors with the current one marked with an asterisk and allows you to select the one that you prefer. It lets the users execute the commands with administrator privileges. If the editor used by default is one that you’re not comfortable using, you can change it with this command: The /etc/sudoers file should always be modified using the visudo command because this command helps to keep you from causing configuration errors that might make the resultant file unusable (i.e., it can break sudo). Trick 3: Changing the default editor for the visudo command Just use the -u option with the sudo command and specify the username. While most people use sudo access to run commands as root, it also allows you to run commands as other users. Alias command in Linux saves a lot of your time and improves your efficiency. Linux Alias Command: Set, Create and Remove Aliases. It can be used to avoid repetitive long typing of commands and shell lines and simplify work. Linux commands are executed on Terminal by pressing Enter at the end of the line. The alias command is simply a way to reference another command. It’s similar to the Command Prompt application in Windows. Trick 2: Running commands as other users - not just root A Linux command is a program or utility that runs on the CLI a console that interacts with the system via texts and processes. If you don’t want anyone to have this ability, don’t put anyone in the sudo (or admin) group on your system and this privilege level will not be implemented. The rest of the line allows members of this group to run any command as any user. The $sudo (or %admin) part of this line is a reference to the sudo (or admin) group. The privileges are derived through a line like this in the /etc/sudoers file: %sudo ALL=(ALL:ALL) ALL If you see inaccuracies in our content, please report the mistake via this form.Assuming the standard /etc/sudoers setup, they should immediately be able to start using sudo commands once this change has been made. If we have made an error or published misleading information, we will correct or clarify the article. ![]() Our editors thoroughly review and fact-check every article to ensure that our content meets the highest standards. Our goal is to deliver the most accurate information and the most knowledgeable advice possible in order to help you make smarter buying decisions on tech gear and a wide array of products and services. sudo, (super-user do), is a command that allows a user to perform tasks that require superuser/root permissions, without logging in as root or assuming. ZDNET's editorial team writes on behalf of you, our reader. Indeed, we follow strict guidelines that ensure our editorial content is never influenced by advertisers. Neither ZDNET nor the author are compensated for these independent reviews. This helps support our work, but does not affect what we cover or how, and it does not affect the price you pay. When you click through from our site to a retailer and buy a product or service, we may earn affiliate commissions. ![]() And we pore over customer reviews to find out what matters to real people who already own and use the products and services we’re assessing. We gather data from the best available sources, including vendor and retailer listings as well as other relevant and independent reviews sites. ZDNET's recommendations are based on many hours of testing, research, and comparison shopping.
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