MAGIC VIEW BOT SERIAL KEY SOFTWARE

So the command: 'ctrl-a f m' would show memory information about the system. The method of sending a break is dependent on the terminal program or hardware used to connect to the serial console.ДЇor minicom, a popular serial terminal program, the command sequence: 'ctrl-a f' will initiate a break sequence. It is possible to invoke a Magic SysRq feature over a serial console by sending a 'break' serial command, followed by the desired key. Many embedded systems have no attached keyboard, but instead use a serial console for text input/output to the running system. The Xen hypervisor has functionality to send magic commands to hosted domains via its 'xm sysrq' command. The linux daemon sysrqd provides a method of accessing SysRq features over TCP/IP port 4094 after authenticating with a plain-text password. This is equivalent to the key combination Alt + SysRq + B which reboots the machine. As an example, shell script can be simply used: While this was originally implemented as part of the kernel's keyboard handler for debugging, the functionality has been also exposed via the proc filesystem and is commonly used to provide extended management capabilities to headless and remote systems. Alternate ways to invoke Magic SysRq Command line access The feature is controlled both by a compile-time option in the kernel configuration, CONFIG_MAGIC_SYSRQ, and a sysctl kernel parameter, kernel.sysrq. Remount all mounted filesystems in read-only mode Output a list of current tasks and their information to the console Switch the keyboard from raw mode, the mode used by programs such as X11 and svgalib, to XLATE mode Output the current registers and flags to the consoleДisplay all active high-resolution timers and clock sources. Reset the nice level of all high-priority and real-time tasks Output current memory information to the console This was originally designed to imitate a Secure Access Key Kill all processes on the current virtual console (Can be used to kill X and svgalib programs, see below) Send the SIGKILL signal to all processes except init Output a terse help document to the consoleДЄny key which is not bound to a command should also perform this action

When using Kernel Mode Setting, provides emergency support for switching back to the kernel's framebuffer console If the in-kernel debugger 'kdb' is present, enter the debugger. Send the SIGTERM signal to all processes except init ( PID 1)Д¬all oom_kill, which kills a process to alleviate an OOM condition Immediately reboot the system, without unmounting partitions or syncing Set the console log level, which controls the types of kernel messages that are output to the console The magic SysRq can also be accessed from the serial console. In this case the combination is a bit trickier: hold 'Alt', hold 'Fn', hold 'SysRq', release 'Fn', press key. On some laptops SysRq is accessible only by pressing 'Fn'. For the same purposes the AltGr key, if present, can be used in place of the Alt key. To avoid this Print Screen feature the magic SysRq combination should include the Ctrl, becoming 'Ctrl'+'Alt'+'SysRq'+key. Under graphical environments (such as Gnome or KDE) 'Alt'+'PrintScrn/SysRq'+key combination generally only leads to a screenshot being dumped. In this case, a separate 'Print Screen' key should be present. Furthermore, some keyboards may not provide a separate SysRq key. For example, on a Dvorak keyboard, the key below '9' and '0' counts as an 'o', not as an 'r', so it shuts the system down instead of switching the keyboard to raw mode. Users with a keyboard layout other than QWERTY have to remember that their layout becomes QWERTY when they use one of these combinations. The key combination consists of Alt, SysRq and another key, which controls the command issued (as shown in the table below). With respect to these tasks, this feature serves as a tool of last resort. Principal among the offered commands are means to forcibly unmount file systems, kill processes, recover keyboard state, and write unwritten data to disk. In this sense, it can be considered a form of escape sequence.

MAGIC VIEW BOT SERIAL KEY SOFTWARE

Much like Sun Microsystems's Open Firmware (OpenBoot), this key combination provides access to powerful tools for software development and disaster recovery.

Magic view bot serial key