Introduction
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In the Linux world, privilege management is essential for maintaining system security and stability. The sudo command allows users to execute tasks that require superuser privileges without needing to log in directly as root. This reduces the risk of accidental errors and improves the traceability of actions performed. In this article we will explore what sudo is, how its authorization mechanism works, how to configure it properly using the sudoers file, and some practical usage examples. Additionally, we will review best practices for using sudo securely and avoiding common vulnerabilities.
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What is sudo?
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Sudo, which stands for “superuser do”, is a utility present in almost all Linux distributions. Its main function is to allow an authorized user to execute a command with the privileges of another user, usually root, without needing to know that account’s password. Instead, the user enters their own password, which is verified against the configuration file /etc/sudoers. If authentication is correct and the user has permission for the requested command, sudo temporarily elevates their privileges and executes the command. This policy-based model offers granular control over who can do what and when.
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How sudo works
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When sudo is invoked, the program first checks the /etc/sudoers file (or files included in /etc/sudoers.d/) to determine if the invoking user is authorized to execute the specified command. The verification includes comparing the username, host, and possibly
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