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I'm asking a question in a very strange manner, i'm sorry. I know what i want, but i don't know exactly how it's called.

I hear somewhere that ubuntu (or linux) has hotkeys , shortcut to start flushing memory.

What i want: for example my laptop stop working, freezing, not responding. But i know that linux kernel is working, and before hot reboot i want do "safe reboot" that means, i want sync everything in swap and in memory with my file system before hot reboot.

Also i know that i can kill my X using some hotkey.

I'm using Ubuntu 13.04

UPDATE according flamemyst answer

Thanks that was exactly what i want.

Just a little addition.

As i read, in Ubuntu some of Magic Commands can be disabled. This link will help How to enable commands

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c0rp
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Whenever you got stuck/frozen GUI, you can try switch to console mode using Ctrl+Alt+F1. This should be the first remedy.

In case of really frozen/stuck, probably because of bug in kernel or driver code, you can invoke Magic SysRq Hot Key ( Alt+PrintScreen/SysRq+Aditional Key ). Please refer to http://en.wikipedia.org/wiki/Magic_SysRq_key for complete additional keys references.

Common use case is to invoke Alt+SysRq+REISUB to safely sync all harddisk and then reboot system. REISUB run the following command in order:

  • R = Taking back keyboard from X server
  • E = Send SIGTERM to all process
  • I = Send SIGKILL to all process
  • S = Sync/Flush data to disk
  • U = Unmount
  • B = Reboot System
flamemyst
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