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Modify existing values in a file

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Top Forums Shell Programming and Scripting Modify existing values in a file
# 8  
Old 04-22-2014
I have tried below code and it is working but it is failing where there is no "kernel.shmall" parameter in file /etc/sysctl.conf
Code:
if grep -o "kernel.shmall" /etc/sysctl.conf > /dev/null
      then
            oldvalue=$(grep -v '^#' /etc/sysctl.conf|grep kernel.shmall|sed 's/=/ /g'| awk '{ print $2}')
      
            if [ $oldvalue -lt 4194304 ]
            then
               sed -i "s|\("kernel.shmall" *= *\).*|\14194304|" /etc/sysctl.conf
            fi
       else
           echo "kernel.shmall=" >> /etc/sysctl.conf
           sed -i "s|\("kernel.shmall" *= *\).*|\14194304|" /etc/sysctl.conf
      fi

is there any modifications do i need to do in script to add "kernel.shmall=4194304" value to file sysctl.conf where there is no parameter kernel.shmall
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lr_environment

LR_ENVIRONMENT.IN(1)					  LogReport's Lire Documentation				      LR_ENVIRONMENT.IN(1)

NAME

       lr_environment - Export Lire configuration in shell script form

SYNOPSIS

       eval `lr_environment`

DESCRIPTION

       The lr_environment command is used to import the Lire configuration in Lire shell scripts.

       All of Lire configuration variables will be written in a format that can be evaled by the shell.

       Shell scripts don't usually have to use that command, since it is done by the defaults file sourced by each command.

       The old names used by when the configuration was done in shell script are also exported by this script for backward compatibility.

AUTHOR

	 Francis J. Lacoste <flacoste@logreport.org>

VERSION

       $Id: lr_environment.in,v 1.12 2006/07/23 13:16:33 vanbaal Exp $

COPYRIGHT

       Copyright (C) 2003 Stichting LogReport Foundation LogReport@LogReport.org

       This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by
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       You should have received a copy of the GNU General Public License along with this program (see COPYING); if not, check with
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Lire 2.1.1							    2006-07-23						      LR_ENVIRONMENT.IN(1)