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Full Discussion: Variable scope in bash
Top Forums Shell Programming and Scripting Variable scope in bash Post 302589325 by Corona688 on Wednesday 11th of January 2012 10:11:52 AM
Old 01-11-2012
The execution is slow because you're running dozens of externals in backticks all the time. You should use externals to process big batches of data -- not individual lines. Externals are fast enough on bulk data, but overkill for anything less, like makng 10 phone calls to say 10 words. Most of your script could probably be done with one execution of awk, if we knew the details.

If you show the input you get from sar, and the output you want from the script, we can find a much more efficient way to do so, probably in nearly pure awk. It can do much more than '{ print $1 }'

I don't see anything obviously wrong with your script, though there's many places in it where things are unquoted and quoting may be important.
 

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LEARN ABOUT PHP

set_time_limit

SET_TIME_LIMIT(3)							 1							 SET_TIME_LIMIT(3)

set_time_limit - Limits the maximum execution time

SYNOPSIS

       bool set_time_limit (int  $seconds)

DESCRIPTION

	Set  the  number of seconds a script is allowed to run. If this is reached, the script returns a fatal error. The default limit is 30 sec-
       onds or, if it exists, the max_execution_time value defined in the php.ini.

	When called, set_time_limit(3) restarts the timeout counter from zero. In other words, if the timeout is the default 30  seconds,  and	25
       seconds into script execution a call such as set_time_limit(20) is made, the script will run for a total of 45 seconds before timing out.

PARAMETERS

	      o $seconds
		- The maximum execution time, in seconds. If set to zero, no time limit is imposed.

RETURN VALUES

	Returns TRUE on success, or FALSE on failure.

NOTES

       Warning

	       This  function  has no effect when PHP is running in safe mode. There is no workaround other than turning off safe mode or changing
	      the time limit in the php.ini.

       Note

	       The set_time_limit(3) function and the configuration directive max_execution_time only affect the  execution  time  of  the  script
	      itself.  Any  time  spent  on activity that happens outside the execution of the script such as system calls using system(3), stream
	      operations, database queries, etc. is not included when determining the maximum time that the script has been running. This  is  not
	      true on Windows where the measured time is real.

SEE ALSO

       max_execution_time, max_input_time.

PHP Documentation Group 													 SET_TIME_LIMIT(3)
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