daemon

In Linux and Unix systems, handling background processes efficiently is a crucial skill for users and administrators alike. Daemons – background processes that run independently of user sessions – can sometimes crash or terminate unexpectedly upon logout due to the SIGHUP (hangup) signal. In this article, we'll explore how to create a daemon that survives this hangup signal using the nohup and disown commands. Q1: What is a SIGHUP signal, and why does it affect running processes? A1: The SIGHUP signal is a signal sent to a process when its controlling terminal is closed. It was originally designed to notify the process of a telephone or modem hangup.

Cron is an indispensable tool for Linux administrators and users, providing a way to automate the tasks that need to be run at scheduled times. However, not all Linux distributions handle cron scheduling in the same way. In this blog post, we'll explore the default cron daemons used by some of the major Linux distributions, such as CentOS, Ubuntu, and Debian, discuss their differences, and their implications for system management and task scheduling. Before diving into the differences, let’s define what a cron daemon does. A cron daemon is a background service that runs on Unix-like operating systems.