Add Value to an attribute in XML File using shell script

Question

I Want to edit XML file thru bash shell script. I am stuck in finding a solution - Kindly share your suggestion if this can be resolved via bash shell script.

I want to add -Dcustom.properties=/fs0/share/custom.properties value to jvmParameters attribute In applicationServerInstance tag if it does not exists.

Input File:

<?xml version="1.0" encoding="UTF-8"?>
<properties>
  <applicationServer>
        <applicationServerInstance id="app" serviceName=" App Server" rmiPort="15001" jvmParameters="-Xmx3072m" maxThreads="1000" programParameters="" distributed="false"/>
    </applicationServer>
    <blah>
    </blah>
    <blah abc="123">
    </blah>
</properties>

Ideal Input File(Above file should be be updated as below):

<?xml version="1.0" encoding="UTF-8"?>
<properties>
  <applicationServer>
        <applicationServerInstance id="app" serviceName=" App Server" rmiPort="15001" jvmParameters="-Xmx3072m -Dcustom.properties=/fs0/share/custom.properties" maxThreads="1000" programParameters="" distributed="false"/>
    </applicationServer>
    <blah>
    </blah>
    <blah abc="123">
    </blah>
</properties>

1sloc · Accepted Answer · 2016-10-22 13:35:00Z

1

To build on the answer proposed by @Kenazov:

#!/usr/bin/env bash

INPUT=input.xml;
OUTPUT=config.xml

xmllint --format $INPUT |\
sed '/<applicationServerInstance/{/-Dcustom.properties=\/fs0\/share\/custom.properties/!s/\(jvmParameters="[^"]*\)"/\1 -Dcustom.properties=\/fs0\/share\/custom.properties"/}' \
> $OUTPUT

answered Oct 22, 2016 at 13:35

1sloc

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SLePort · Accepted Answer · 2016-10-22 13:44:28Z

1

With sed:

sed -i '/<applicationServerInstance/{/-Dcustom\.properties=\/fs0\/share\/custom\.properties/!s/\(jvmParameters="[^"]*\)"/\1 -Dcustom.properties=\/fs0\/share\/custom.properties"/}' file

When <applicationServerInstance is found, if -Dcustom.properties=/fs0/share/custom.properties is not found in the line, it's appended as attribute value to jvmParameters.

As @1sloc point out in comment, you'd better sanitize your file using for instance xmllint before executing this sed to make sure that <applicationServerInstance and jvmParameters are on the same line.

The -i flag is to edit the file in place.

edited Oct 22, 2016 at 13:44

answered Oct 22, 2016 at 13:21

SLePort

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1 Comment

1sloc Over a year ago

To make sure, the file should first be sanitized using xmllint or the likes. Only after such a sanitation, we can be sure that applicationServerInstance and jvmParameters are on the same line, for instance.

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