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Full Discussion: Modify existing values in a file
Top Forums Shell Programming and Scripting Modify existing values in a file Post 302897597 by darling on Tuesday 15th of April 2014 10:39:08 AM
Old 04-15-2014
ok.. Thanks for your swift responce.. Let me tell you what i am trying to do here..

i am trying to edit "sysctl.conf" file.. if this file has got below variables with below values or morethan that then it should leave that value...

If variable value is less than that then it should alter the value to below given value

For example:

sysctl.conf file has below values

Code:
kernel.shmall = 5194304 (more than 4194304 so it should leave it as it is)

kernel.shmmax = 2147483648 (it is equal to 2147483648 so it should leave it as it is)

kernel.msgmni = 124 (it is less than 1024 so it should alter the value to 1024)

expecting output is
Code:
kernel.shmall = 5194304 

kernel.shmmax = 2147483648

kernel.msgmni = 1024

will you able to help me on this to write a script or weather i am going in right direction to achive above output by previously shared script

---------- Post updated at 09:39 AM ---------- Previous update was at 03:49 AM ----------

This is my script i am preparing to replace "kernel.shmall" if value is less than equal 4194303

script:

Code:

#!/bin/sh
echo `cat /emblocal/sysctl.conf|fgrep kernel.shmall`|while read kernel.shmall
if
[ "kernel.shmall" -le 4194303 ];
then
kernel.shmall = 4194304
fi

output of

Code:
cat /emblocal/sysctl.conf|fgrep kernel.shmall

is

Code:
kernel.shmall = 419430 #kernel.shmall = 2097152

it should take only kernel.shmall, not which are commented "#" like #kernel.shmall



can you let me know how to do it?
 

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LEARN ABOUT DEBIAN

sysctl.d

SYSCTL.D(5)							     sysctl.d							       SYSCTL.D(5)

NAME

       sysctl.d - Configure kernel parameters at boot

SYNOPSIS

       /etc/sysctl.d/*.conf

       /run/sysctl.d/*.conf

       /usr/lib/sysctl.d/*.conf

DESCRIPTION

       systemd uses configuration files from the above directories to configure sysctl(8) kernel parameters to load during boot.

CONFIGURATION FORMAT

       The configuration files should simply contain a list of variable assignments, separated by newlines. Empty lines and lines whose first
       non-whitespace character is # or ; are ignored.

       Note that both / and . are accepted as separators in sysctl variable names.

       Each configuration file is named in the style of <program>.conf. Files in /etc/ overwrite files with the same name in /usr/lib/. Files in
       /run overwrite files with the same name in /etc/ and /usr/lib/. Packages should install their configuration files in /usr/lib/, files in
       /etc/ are reserved for the local administration, which possibly decides to overwrite the configurations installed from packages. All files
       are sorted by filename in alphabetical order, regardless in which of the directories they reside, to ensure that a specific configuration
       file takes precedence over another file with an alphabetically later name.

EXAMPLE

       Example 1. /etc/sysctl.d/domain-name.conf example:

	   # Set kernel YP domain name
	   kernel.domainname=example.com

SEE ALSO

       systemd(1), sysctl(8), sysctl.conf(5)

AUTHOR

       Lennart Poettering <lennart@poettering.net>
	   Developer

systemd 							    10/07/2013							       SYSCTL.D(5)
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