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Linux.

Contents

Linux distro.

http://distrowatch.com/
Comparing Linux distros.

SysRq.

x86: ALT-SysRq-<command key>
SPARC: ALT-STOP-<command key>
PPC: ALT - Print Screen (or F13) - <command key>

'b' - reboot
'p' - dump the current registers and flags to your console
'r' - take control of keyboard back from X
'e' - send SIGTERM to all processes, except for init
'i' - send SIGKILL to all processes, except for init
's' - attempt to sync all mounted filesystems
'u' - remount all filesystems read-only

You can put one of such line:

$ echo 0 > /proc/sys/kernel/sysrq  # disable
$ echo 1 > /proc/sys/kernel/sysrq  # enable

to your /etc/rc.local or alternativaly place under /etc/sysctl:

kernel.sysrq = 1

http://www.kernel.org/doc/Documentation/sysrq.txt
              Linux Magic System Request Key Hacks

Comunity.

http://kernelnewbies.org/
Linux Kernel Newbies