Shutdown server when network inactive

Operating Systems Linux Red Hat Shutdown server when network inactive

05-15-2013

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Shutdown server when network inactive

I was referring script to shutdown server from local interface ubuntuforums.org/archive/index.php/t-2017336.html. This is scheduled in CRON. It will run every 20 minutes
and check for inactivity. It compares the RX and TX packets from 20 minutes ago to detect if they significantly increased. If they haven't, it will force the system to sleep.But in my case its not working properly.
I wanted to know what below expression does.
if [ $rx -le $t_rx ] || [ $tx -le $t_tx ]; then ## If network packets have not changed that much
echo "Powering off ..." >> $log

sanjaymp

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LEARN ABOUT PHP

register_shutdown_function

REGISTER_SHUTDOWN_FUNCTION(3)						 1					     REGISTER_SHUTDOWN_FUNCTION(3)

register_shutdown_function - Register a function for execution on shutdown

SYNOPSIS

       void register_shutdown_function (callable  $callback, [mixed  $parameter], [mixed  $...])

DESCRIPTION

	Registers a $callback to be executed after script execution finishes or exit(3) is called.

	Multiple  calls  to  register_shutdown_function(3)  can be made, and each will be called in the same order as they were registered. If you
       call exit(3) within one registered shutdown function, processing will stop completely and no other registered shutdown  functions  will	be
       called.

PARAMETERS

	      o $callback
		-  The	shutdown  callback  to register.  The shutdown callbacks are executed as the part of the request, so it's possible to send
		output from them and access output buffers.

	      o $parameter
		- It is possible to pass parameters to the shutdown function by passing additional parameters.

	      o $...
		-

RETURN VALUES

	No value is returned.

ERRORS
/EXCEPTIONS
	If the passed callback is not callable a E_WARNING level error will be generated.

EXAMPLES

       Example #1

	      register_shutdown_function(3) example

	      <?php
	      function shutdown()
	      {
		  // This is our shutdown function, in
		  // here we can do any last operations
		  // before the script is complete.

		  echo 'Script executed with success', PHP_EOL;
	      }

	      register_shutdown_function('shutdown');
	      ?>

NOTES

       Note

	       Working directory of the script can change inside the shutdown function under some web servers, e.g. Apache.

       Note

	       Shutdown functions will not be executed if the process is killed with a SIGTERM or SIGKILL signal. While  you  cannot  intercept  a
	      SIGKILL, you can use pcntl_signal(3) to install a handler for a SIGTERM which uses exit(3) to end cleanly.

SEE ALSO

       auto_append_file, exit(3), The section on connection handling.

PHP Documentation Group 											     REGISTER_SHUTDOWN_FUNCTION(3)

Red Hat