This guide is an in-depth resource for IT professionals focused on advanced user management within Linux environments. It covers essential principles for managing user accounts, privileges, and permissions, emphasizing security best practices like the Least Privilege Rule and the use of sudo for privilege escalation. Detailed sections explain file permissions, group management, secure remote management, and the use of Infrastructure as Code (IaC) for large-scale server administration. With practical examples and guidance on tools like SSH, LDAP, PAM, and sudo, the guide empowers administrators to maintain efficient, secure, and scalable Linux systems.

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