Operating Systems / Linux
System Startup and Services
A closer look at System Startup and Services.
Booting Linux and systemd
From firmware to login, boot is a chain of loaders, an initial RAM disk, and PID 1. This overview covers UEFI and GRUB, initramfs, systemd units and targets, journald, and how Debian differs from older init and macOS launchd at a glance.
Scheduling tasks with cron and systemd timers
Linux runs recurring and one-shot jobs through several schedulers. This overview compares cron and crontab syntax, anacron, systemd timers, and at, and explains when each fits on a typical Debian server or desktop.