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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 ]
Single-user mode is a mode in which a multiuser computer operating system boots into a single superuser. It is mainly used for maintenance of multi-user environments such as network servers. Some tasks may require exclusive access to shared resources, for example running fsck on a network share. This mode can also be used for security purposes ...
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.
Single-user mode, booted to system console only, with only root filesystem mounted (as read-only) s: Single-user mode, identical to S except the current terminal acts as the system console 1: Single-user mode with local filesystems mounted (read-write) 2: Multi-user mode with most daemons started and Common Desktop Environment launched 3
A QWERTY keyboard layout with the position of Control, Alt and Delete keys highlighted. Control-Alt-Delete (often abbreviated to Ctrl+Alt+Del and sometimes called the "three-finger salute" or "Security Keys") [1] [2] is a computer keyboard command on IBM PC compatible computers, invoked by pressing the Delete key while holding the Control and Alt keys: Ctrl+Alt+Delete.
Switch focus to the next/previous tab/view within a window Ctrl+Tab ↹: Ctrl+Tab ↹. Ctrl+⇧ Shift+Tab ↹. Ctrl+Tab ↹-> Ctrl+⇧ Shift+Tab ↹ <- Switch focus to the next/previous panel on the desktop Ctrl+Alt+Tab ↹ / Ctrl+Alt+⇧ Shift+Tab ↹: Switch focus to the next/previous panel (without dialog) Ctrl+Alt+Esc / Ctrl+Alt+⇧ Shift+Esc
In Linux, if the script was executed by a regular user, the shell would attempt to execute the command rm -rf / as a regular user, and the command would fail. However, if the script was executed by the root user, then the command would likely succeed and the filesystem would be erased. It is recommended to use sudo on a per-command basis instead.
In the lower right we can see a terminal emulator running a Unix shell, in which the user can type commands as if they were sitting at a terminal. In computing , a shell is a computer program that exposes an operating system 's services to a human user or other programs.