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Full Discussion: Optimize and Speedup the script
Top Forums Shell Programming and Scripting Optimize and Speedup the script Post 302396452 by methyl on Thursday 18th of February 2010 12:46:56 PM
Old 02-18-2010
If in doubt correct all syntax errors even if the shell didn't spot them. You can get really strange effects.


On the performance front it would help to see how you are calling the script and in particular whether $3 contains wildcards. The only line which could be appreciably slow is the line which counts the records which match $4.
How big are your input file(s) - size and number of records ?
How many input files are there?

Do you call the script 9 times (once for every case statement) with different parameters? This could be the performance problem if every input file is searched 9 times for every run set of the script. If the input files are large it may be better to select all the records which interest you in one pass and then work on that subset.

How often do you run the script? Is it run from the command line, a control script, or from cron?
 

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LEARN ABOUT LINUX

service

service(8)						      System Manager's Manual							service(8)

NAME

       service - run a System V init script

SYNOPSIS

       service SCRIPT COMMAND [OPTIONS]

       service --status-all

       service --help | -h | --version

DESCRIPTION

       service runs a System V init script in as predictable environment as possible, removing most environment variables and with current working
       directory set to /.

       The SCRIPT parameter specifies a System V init script, located in /etc/init.d/SCRIPT.  The  supported  values  of  COMMAND  depend  on  the
       invoked	script,  service  passes  COMMAND and OPTIONS it to the init script unmodified.  All scripts should support at least the start and
       stop commands.  As a special case, if COMMAND is --full-restart, the script is run twice, first with the stop command, then with the  start
       command.

       service --status-all runs all init scripts, in alphabetical order, with the status command.

EXIT CODES

       service calls the init script and returns the status returned by it.

FILES

       /etc/init.d
	      The directory containing System V init scripts.

ENVIRONMENT

       LANG, TERM
	      The only environment variables passed to the init scripts.

SEE ALSO

       /etc/init.d/skeleton,
       update-rc.d(8),
       init(8),
       invoke-rc.d(8).

								     Jan 2006								service(8)
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