Shell Programming and Scripting

Hello,

I have an xml file whose contacts are like below:

<Node>Apple
<B>Value1</B>
<B>Value2</B>
<B>Value3</B>
</Node>
<Node>Mango
<B>Value1</B>
<B>Value2</B>
<B>Value3</B>
</Node>
<Node>Apple
<B>Value1</B>
<B>Value2</B>
<B>Value3</B>
</Node>
<Node>Bannana
<B>Value1</B>
<B>Value2</B>
<B>Value3</B>
</Node>

I would like to find/grep Node type "Apple" and than would like to change "value3" to "value4" of Node Apple only in this xml file. Is it possible that I can do it through sed or any other scripting utility?

Any help would be highly appreciated. Thanks in advance!!

BR,
Umar

use awk, if you dont have nawk

Code:

 
$ nawk '/Node/,/<\/Node/{if($0~/Apple/)a=1;}{if($0~/Value3/ && a){sub("Value3","Value4");a=0}}1' test.txt
<Node>Apple
<B>Value1</B>
<B>Value2</B>
<B>Value4</B>
</Node>
<Node>Mango
<B>Value1</B>
<B>Value2</B>
<B>Value3</B>
</Node>
<Node>Apple
<B>Value1</B>
<B>Value2</B>
<B>Value4</B>
</Node>
<Node>Bannana
<B>Value1</B>
<B>Value2</B>
<B>Value3</B>
</Node>

Hello itkamaraj,

Thank you for your reply, your script perfectly fits into my example. However I am attaching my original file where I would like to change "Accumulator Factor" under node "DiscountOnUsage" only.

<Node>DiscountOnUsage
<Condition>ActiveOffer
<ActiveOffer>401</ActiveOffer>
</Condition>
.
.
.
<Accumulator Factor="3.78333333333333" ID="6"/>
</Tariff>
</Node>

Can you please help in adopting this script as per my above requirement. FYI original file is also attached.

Thanks!!

P.S: For instance I would like to change Accumulator Factor to --> "<Accumulator Factor="3.78333333333333" ID="6"/><Accumulator Factor="3.78333333333333" ID="72"/>

BR,
Umar

How about this ?

Code:

perl -nle 'if(/\<Node\>DiscountOnUsage/ ... /\<\/Node\>/){$_=~s/(\<Accumulator Factor\s*=\s*)(.+?\s+ID\s*=\s*)(.+?)\/\>/$1$2"72"\/\>/g;print $_;}else{print}' zone_IDD.txt