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========

 Linux.

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.. contents::

   :local:

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