Penguin

Used under Linux for Magic Sys Key. If you have this compiled into your kernel, and enabled in proc (see /etc/sysctl.conf or echo 1 >/proc/sys/kernel/sysrq)

This means you can do nifty things even if your machine has completely screwed up.

A useful sequence:

Alt-SysReq-U
Force remount of all filesystems readonly
Alt-SysReq-S
Sync all disks
Alt-SysReq-B
Reboot

Other useful commands:

Alt-SysReq-?
List all sysreq's
Alt-SysReq-K
Kill all processes

--- CategoryKernel