User:RichiH/PDF/Magic SysReq

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From Magic SysRq key

Set the console log level, which controls the types of kernel messages that are output to the console 0 through 9 0 through 9 0 through 9
(without using shift)
Immediately reboot the system, without unmounting partitions or syncing b x b
Reboot kexec and output a crashdump c j c
Display all currently held Locks d e d
Send the SIGTERM signal to all processes except init (PID 1) e . e
Call oom_kill, which kills a process to alleviate an OOM condition f u f
When using Kernel Mode Setting, provides emergency support for switching back to the kernel's framebuffer console[1] g i g
Output a terse help document to the console
Any key which is not bound to a command should also do the trick
h d h
Send the SIGKILL signal to all processes except init i c i
Kill all processes on the current virtual console (Can be used to kill X and svgalib programs, see below)
This was originally designed to imitate a Secure Access Key
k t k
Show a stack backtrace of all currently executing tasks l n l
Output current memory information to the console m m ,
Reset the nice level of all high-priority and real-time tasks n b n
Shut off the system o r o
Output the current registers and flags to the console p l p
Display all active high-resolution timers and clock sources. q ' a
Switch the keyboard from raw mode, the mode used by programs such as X11 and svgalib, to XLATE mode r p r
Sync all mounted filesystems s o s
Output a list of current tasks and their information to the console t y t
Remount all mounted filesystems in read-only mode u g u
Output Voyager SMP processor information v k v
Display list of blocked (D state) tasks w , z