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Editor to share with you what are the shortcuts requested by the system in Linux, I believe most people do not know much about it, so share this article for your reference, I hope you will gain a lot after reading this article, let's go to know it!

Linux's magical system request key is a lifesaver for the system. It is a standard key on most keyboards, usually on i386 and ppc, accessed through +. When this feature is enabled, no matter what state the kernel is in, it can communicate with the kernel through a special key combination. This feature allows you to do some useful work when faced with a dying system.

Note: this feature requires CONFIG_MAGIC_SYSRQ to be enabled when configuring the kernel and a switch that sysctl uses to mark this feature.

Enable command: echo 1 > / proc/sys/kernel/sysrq

Here are some main commands and their functions: (sysrq represents the system request standard key, for example, sysrq+b is + + b on i386, the same below)

Sysrq+b: restart the system

Sysrq+e: sends SIGTERM signals to all processes except init

Sysrq+h: displaying SysRq in the console

Sysrq+i: sends SIGKILL signals to all processes except init

Sysrq+k: security access key that kills all programs on this console

Sysrq+l: sends SIGKILL signals to all processes, including init

Sysrq+m: output memory information to the console

Sysrq+o: turn off the machine

Sysrq+p: outputs the register information to the console.

Sysrq+r: turn off keyboard original mode

Sysrq+s: flushes all mounted file systems to disk.

Sysrq+t: outputs the task information to the console.

Sysrq+u: unmount all loaded file systems.

The above is all the contents of the article "what are the shortcuts requested by the system in Linux". Thank you for reading! I believe we all have a certain understanding, hope to share the content to help you, if you want to learn more knowledge, welcome to follow the industry information channel!

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