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Full Discussion: "Sed" while changing a key in a file
Top Forums Shell Programming and Scripting "Sed" while changing a key in a file Post 302300345 by raghu.amilineni on Tuesday 24th of March 2009 01:22:32 AM
Old 03-24-2009
"Sed" while changing a key in a file
Hi,

I am new to shell scripting.

I use Solaris10 machine.I have to write a simple shell script which replaces a part of string a file.

my file name is properties.ini, which has the following values
#application properties
location.mysql = /opt/bin # ( here location.mysql is considered as #key and /opt/bin is considered as value )
location.java = /usr/bin

Now

when i run a shell script I have to replace the value of location.mysql from /opt/bin to /opt/xyz

Currently I user the following code Which i am able to replace.

#!/bin/sh
KEY=location.mysql
VALUE=/opt/xyz
FILE=./properties.ini

sed "s|^$KEY.*|$KEY=$VALUE|g" $FILE > ./temp.bak
mv ./temp.bak $FILE

The above code is working fine, but in the code after replacing the value from location.mysql=/opt/bin to location.mysql=/opt/xyz I am moving into a file called temp.bak(temporarily) , and then moving back that file into its original name(properties.ini)

Is there any solution to replace the value in the file permanently with out moving the files.

Thanks in advance,
RaghuDeep Amilineni
raghu.amilineni
 

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LEARN ABOUT LINUX

chsh

CHSH(1) 							   User Commands							   CHSH(1)

NAME

       chsh - change login shell

SYNOPSIS

       chsh [options] [LOGIN]

DESCRIPTION

       The chsh command changes the user login shell. This determines the name of the user's initial login command. A normal user may only change
       the login shell for her own account; the superuser may change the login shell for any account.

OPTIONS

       The options which apply to the chsh command are:

       -h, --help
	   Display help message and exit.

       -s, --shell SHELL
	   The name of the user's new login shell. Setting this field to blank causes the system to select the default login shell.

       If the -s option is not selected, chsh operates in an interactive fashion, prompting the user with the current login shell. Enter the new
       value to change the shell, or leave the line blank to use the current one. The current shell is displayed between a pair of [ ] marks.

NOTE

       The only restriction placed on the login shell is that the command name must be listed in /etc/shells, unless the invoker is the superuser,
       and then any value may be added. An account with a restricted login shell may not change her login shell. For this reason, placing /bin/rsh
       in /etc/shells is discouraged since accidentally changing to a restricted shell would prevent the user from ever changing her login shell
       back to its original value.

FILES

       /etc/passwd
	   User account information.

       /etc/shells
	   List of valid login shells.

       /etc/login.defs
	   Shadow password suite configuration.

SEE ALSO

       chfn(1), login.defs(5), passwd(5).

User Commands							    06/24/2011								   CHSH(1)
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