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The magic SysRq key is a key combination understood by the Linux kernel, which allows the user to perform various low-level commands regardless of the system's state. It is often used to recover from freezes , or to reboot a computer without corrupting the filesystem . [ 1 ]
In FreeBSD and DragonFly BSD it can be changed before rebooting the system with the command nextboot -o "-s" -k kernel, and its bootloader offers the option on bootup to start in single-user mode. In Solaris the command reboot -- -s will cause a reboot into single-user mode. macOS users can accomplish this by holding down ⌘ S after powering ...
A kernel panic message from a Linux system An OpenSolaris kernel panic. Kernel panic in Ubuntu 13.04 "Raring Ringtail" (Linux kernel 3.8) in Oracle VM VirtualBox
This is an accepted version of this page This is the latest accepted revision, reviewed on 29 December 2024. Family of Unix-like operating systems This article is about the family of operating systems. For the kernel, see Linux kernel. For other uses, see Linux (disambiguation). Operating system Linux Tux the penguin, the mascot of Linux Developer Community contributors, Linus Torvalds Written ...
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.
In Unix and Linux, the shutdown command can be used to turn off or reboot a computer. Only the superuser or a user with special privileges can shut the system down. One commonly issued form of this command is shutdown -h now, which will shut down a system immediately. Another one is shutdown -r now to reboot.
This behavior is enforced in some variations of cron, such as that provided in Debian, [10] so that simply restarting the daemon does not re-run @reboot jobs. @reboot can be useful if there is a need to start up a server or daemon under a particular user, and the user does not have access to configure init to start the program.
systemctl is a command to introspect and control the state of the systemd system and service manager. Not to be confused with sysctl . systemd-analyze may be used to determine system boot-up performance statistics and retrieve other state and tracing information from the system and service manager.