Q18

What is effective user ID?

Q: What is effective user ID?

> * **Real User ID (RUID)**: Identifies the actual user who launched the process. * **Effective User ID (EUID)**: The user identity used by the kernel to evaluate permissions when the process attempts to access files or network resources. * *SUID Role*: When a standard user runs an SUID executable (like `passwd`), the RUID remains the standard user, but the EUID changes to `root`, granting root-level file access.

💬Answer

Real User ID (RUID): Identifies the actual user who launched the process.
Effective User ID (EUID): The user identity used by the kernel to evaluate permissions when the process attempts to access files or network resources.
SUID Role: When a standard user runs an SUID executable (like passwd), the RUID remains the standard user, but the EUID changes to root, granting root-level file access.

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