Permissions

Definition

In computing, permissions are access rights granted to users, programs, or processes to perform specific operations on a file, directory, or other resource. The OS is responsible for enforcing these permissions.

Why It Matters

Permissions are a fundamental security mechanism. They prevent unauthorized users or programs from reading, modifying, or deleting sensitive data, protecting the integrity and confidentiality of the system.

Contextual Example

On a Unix-like system (like Linux or macOS), a file has separate permissions for read (r), write (w), and execute (x) for the file's owner, a group, and everyone else. The command `chmod` is used to change these permissions.

Common Misunderstandings

• The "root" or "administrator" user has permissions to override all other user permissions.
• Incorrect file permissions are a common source of both security vulnerabilities and application errors.