System Accounts:
* root: The superuser account with complete system access. It's crucial for system administration and troubleshooting, but should be used with extreme caution due to its vast powers.
* daemon: A generic account used by system services and processes that run in the background. It's not intended for direct login.
* bin: Used by programs that need to access system files and resources, often with restricted permissions.
* sys: Another account used by system programs, primarily for managing system resources.
* nobody: A special account with minimal permissions, used for running applications that require lower privileges.
User Accounts:
* The initial user: This account is created during the installation process, and its name varies depending on the distribution (often "user", "admin", or something similar). This account is typically used for initial system setup and configuration.
Note: The exact list of built-in accounts and their names can differ slightly between Linux distributions. Some distributions may have additional system accounts tailored to their specific requirements.
It's important to understand the purpose of each built-in account and use them responsibly. You should always avoid logging in as root unless absolutely necessary, and instead utilize the `sudo` command for performing administrative tasks with elevated privileges.