http://linuxgazette.net/issue81/vikas.html
s: This command syncs the kernel buffers to disk. You should do this before unmounting.
b: Does an immediate reboot, pretty much like pressing the reset button. For a safe shutdown, precede this with a sync and Unmount.
p: Prints the contents of the CPU registers.
m: Shows memory information.
t: Shows information about the tasks currently running.
0-9: Sets the console log-level to the specified number.
e: Sends a SIGTERM to all processes, except init.
i: Sends a SIGKILL(sure kill) to all processes, except init.
l: Sends a SIGKILL to all processes, including init(you won't be able to anything after this).
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