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The pmset command is able to schedule system sleep, shutdown, wakeup or power on events. The schedule argument is for setting up one-time power events, and repeat is for setting up daily or weekly events. Scheduling of events can only be done by a privileged user. The schedule argument recognizes the following additional arguments:
Reset the nice level of all high-priority and real-time tasks n: b: n: k: Shut off the system o: r: o: y: Output the current registers and flags to the console p: l: p; Display all active high-resolution timers and clock sources. q ' a: q: Switch the keyboard from raw mode, used by programs such as X11 and SVGAlib, to XLATE mode r: p: r: p ...
Ubuntu releases are also given code names, using an adjective and an animal with the same first letter – an alliteration, e.g., "Dapper Drake".With the exception of the first two releases, code names are in alphabetical order, and except for the first three releases, the first letters are sequential, allowing a quick determination of which release is newer.
A runlevel defines the state of the machine after boot. Different runlevels are typically assigned (not necessarily in any particular order) to the single-user mode, multi-user mode without network services started, multi-user mode with network services started, system shutdown, and system reboot system states.
Shutdown options have been moved from a separate dialog box to the start menu, in Windows Vista and later versions of Microsoft Windows. The above is from Windows 7.. In Microsoft Windows and ReactOS, a PC or server is shut down by selecting the Shutdown item from the Start menu on the desktop.
Ubuntu (/ ʊ ˈ b ʊ n t uː / ⓘ uu-BUUN-too) [8] is a Linux distribution derived from Debian and composed mostly of free and open-source software. [9] [10] [11] Ubuntu is officially released in multiple editions: Desktop, [12] Server, [13] and Core [14] for Internet of things devices [15] and robots.
The cron in Version 7 Unix was a system service (later called a daemon) invoked from /etc/rc when the operating system entered multi-user mode. [10] Its algorithm was straightforward: Read /usr/lib/crontab [11] Determine if any commands must run at the current date and time, and if so, run them as the superuser, root. Sleep for one minute
The CFS does away with the old notion of per-priorities fixed time-slices and instead it aims at giving a fair share of CPU time to tasks (or, better, schedulable entities). [ 1 ] [ 2 ] Starting from version 6.6 of the Linux kernel, it was replaced by the EEVDF scheduler.