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Essential System Tools: journalctl – query and display messages from the journal

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Linux
Software

Systemd (stylized as systemd) is a suite of software that provides fundamental building blocks for Linux. It’s a Linux-specific system and service manager, offering an init system used to bootstrap the user space and to manage system processes after booting. The software provides a standard process for controlling what programs run when a Linux system boots up. Systemd, was created by Red Hat’s Lennart Poettering and Kay Sievers. It provides more than running core programs. It also starts a journal of system activity, the network stack, a cron-style job scheduler, user logins, and many other jobs.

systemd has courted a lot of controversy with some legitimate concerns about its design details (for example, the decision to use binary logs), and debate about whether it extends its reach too far. Nevertheless, this system and service manager has been adopted by many popular Linux distributions such as Fedora, Ubuntu, Debian, openSUSE, and Arch. Why? Essentially, because it offers a fast boot-up, parallelizing the boot process, as well as being designed with security in mind with most daemons running at minimal privileges. It also unifies system objects, and offers a simple configuration file language.

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