Linux Administration

  1. User and Group Management
    1. Understanding Users and Groups
      1. User Accounts
        1. root User
          1. System Users
            1. Regular Users
            2. Group Accounts
              1. Primary Groups
                1. Supplementary Groups
                2. User and Group ID
                  1. UID/GID Ranges
                    1. Special UIDs/GIDs
                  2. Managing User Accounts
                    1. Creating Users
                      1. Modifying Users
                        1. Deleting Users
                          1. Setting and Changing Passwords
                            1. Locking and Unlocking Accounts
                              1. Managing User Home Directories
                                1. The /etc/passwd file
                                  1. Structure and Fields
                                    1. Security Considerations
                                    2. The /etc/shadow file
                                      1. Password Hashes
                                        1. Expiration and Aging
                                      2. Managing Group Accounts
                                        1. Creating Groups
                                          1. Modifying Groups
                                            1. Deleting Groups
                                              1. Adding and Removing Users from Groups
                                                1. The /etc/group file
                                                  1. Structure and Fields
                                                  2. The /etc/gshadow file
                                                    1. Group Passwords
                                                  3. Sudo and Privileged Access
                                                    1. Purpose of Sudo
                                                      1. Configuring /etc/sudoers with visudo
                                                        1. Granting and Revoking Sudo Privileges
                                                          1. Security Best Practices

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                                                        2. The Command-Line Interface (CLI)

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                                                        4. File Permissions and Ownership