Services #

Services, also known as daemons, are background processes that run continuously on a Unix-like operating system, such as Linux, BSD, or macOS. These services perform specific functions, such as managing network connections, handling file transfers, or providing web server functionality. Daemons typically start automatically when the system boots up and remain active until the system shuts down or the service is manually stopped.

Daemons typically have the following characteristics:

  • Background Processes: Daemons run in the background, meaning they operate independently of user interaction and do not require a graphical interface to function.

  • Persistent Operation: Unlike regular user applications that terminate when their task is complete, daemons continue running indefinitely, waiting for incoming requests or events to handle.

  • Service-Oriented: Each daemon is responsible for providing a specific service or functionality to the operating system or network. Examples include the SSH daemon for secure remote access, the httpd daemon for serving web pages, and the cron daemon for scheduling tasks.

  • Controlled by Init System: On Unix-like systems, daemons are managed by the init system, which starts, stops, and monitors their operation.

  • Logging and Error Handling: Daemons typically write log files to record their activities and any errors encountered during operation.

  • Configuration Files: Most daemons have configuration files that allow administrators to customize their behavior, specify settings, and define how they interact with the system and users.