What is the use of PrtSc SysRq in keyboard?
What is the use of PrtSc SysRq in keyboard?
The SysRq key (sometimes Sys Req) is an abbreviation for System Request. These days, keyboards generally combine the SysRq key with the Print Screen (or Prt Scr) key. To actually invoke the System Request key, you’d need to press Alt+SysRq. This key was meant for invoking low-level operating system functions.
Where is SysRq key on laptop?
The SysRq key is usually the same key as PrintScreen . If your keyboard doesn’t have a key labeled SysRq or PrintScreen , it may not have a key that sends the scan code that Linux expects. For the purpose of magic SysRq, the SysRq key is whichever key sends the scan code 99.
Where is Print Screen SysRq?
Print Screen is a key present on most PC keyboards. The print screen key is typically located next to the F1-F12 keys on your keyboard. NOTE: If you are using a laptop, you may have to hold the Fn (Function Key) to access the Print Screen function. It sometimes shares a key with SysRq.
What is SysRq laptop?
System Request (SysRq or Sys Req) is a key on personal computer keyboards that has no standard use. Introduced by IBM with the PC/AT, it was intended to be available as a special key to directly invoke low-level operating system functions with no possibility of conflicting with any existing software.
How do you Ctrl Break?
In a PC, holding down the Ctrl key and pressing the Break key cancels the running program or batch file. See Ctrl-C.
What does Num Lock do?
The NumLock key changes the operation of the numeric keypad keys on a PC-style keyboard.
Where is the SysRq?
From user space programs (such as a command line shell), SysRq may be accessed by writing to /proc/sysrq-trigger (e.g., echo s > /proc/sysrq-trigger ). Many embedded systems have no attached keyboard, but instead use a serial console for text input/output to the running system.