XML parsing by UNIX


 
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# 1  
Old 03-20-2013
XML parsing by UNIX

Hi,
I am new in shell scripting. i want to extract tag values in xml files by using shell script. my files like this:
Code:
<cw: properties>
<cw:std_properties>
<tns: properties>
<tns:name>AdminOutQueue</tns:name> 
<tns:type>String</tns:type> 
<tns:subtype>QueueName</tns:subtype> 
<tns:value xml:space="preserve">WBIA.SMRPSC1.ADOUTQ</tns:value> 
<tns:description>The logical queue that will be used by the connector to write admin messages to the broker</tns:description> 
<tns:updateMethod>component restart</tns:updateMethod> 
<tns:location>
<tns:reposController>false</tns:reposController> 
<tns:reposAgent>true</tns:reposAgent> 
<tns:localConfig>true</tns:localConfig> 
</tns:location>
<tns:isEncrypted>false</tns:isEncrypted> 
</tns: properties>
<tns: properties>
<tns:name>AgentTraceLevel</tns:name> 
<tns:type>Integer</tns:type> 
<tns:subtype /> 
<tns:value xml:space="preserve">5</tns:value> 
<tns:description>Trace level for the connector agent</tns:description> 
<tns:updateMethod>component restart</tns:updateMethod> 
<tns:location>
<tns:reposController>false</tns:reposController> 
<tns:reposAgent>true</tns:reposAgent> 
<tns:localConfig>true</tns:localConfig> 
</tns:location>
<tns:isEncrypted>false</tns:isEncrypted> 
</tns: properties>
 
</cw: properties>
</cw:std_properties>

i want to extract AdminOutQueue or AgentTraceLevel property value like tns:value for both.
how can i do that?please help.
Thanks in advance

regards,
Arindam

Last edited by Corona688; 03-20-2013 at 08:05 PM..
# 2  
Old 03-20-2013
Quote:
Originally Posted by arindam guha
Hi,
I am new in shell scripting. i want to extract tag values in xml files by using shell script. my files like this:
<cw: properties>
<cw:std_properties>
<tns: properties>
<tns:name>AdminOutQueue</tns:name>
<tns:type>String</tns:type>
<tns:subtype>QueueName</tns:subtype>
<tns:value xml:space="preserve">WBIA.SMRPSC1.ADOUTQ</tns:value>
<tns:description>The logical queue that will be used by the connector to write admin messages to the broker</tns:description>
<tns:updateMethod>component restart</tns:updateMethod>
<tns:location>
<tns:reposController>false</tns:reposController>
<tns:reposAgent>true</tns:reposAgent>
<tns:localConfig>true</tns:localConfig>
</tns:location>
<tns:isEncrypted>false</tns:isEncrypted>
</tns: properties>
<tns: properties>
<tns:name>AgentTraceLevel</tns:name>
<tns:type>Integer</tns:type>
<tns:subtype />
<tns:value xml:space="preserve">5</tns:value>
<tns:description>Trace level for the connector agent</tns:description>
<tns:updateMethod>component restart</tns:updateMethod>
<tns:location>
<tns:reposController>false</tns:reposController>
<tns:reposAgent>true</tns:reposAgent>
<tns:localConfig>true</tns:localConfig>
</tns:location>
<tns:isEncrypted>false</tns:isEncrypted>
</tns: properties>

</cw: properties>
</cw:std_properties>


i want to extract AdminOutQueue or AgentTraceLevel property value like tns:value for both.
how can i do that?please help.
Thanks in advance

regards,
Arindam
Grep will get the whole line.
Code:
line=$(grep *AdminOutQueue* file_name)

In Bash ${string#substring} removes substring from the front of string and
${string%substring} from the end
Code:
name="${"${"$line"#"<tns:name>AdminOutQueue</tns:"}"%">"}"

Mike

PS: in the future, start a new thread for a new subject.
PPS. Nesting expansions rarely works, the example above may not work, you may need an intermediate variable.


Moderator's Comments:
Mod Comment This post moved from other thread to here


edit: nesting substitutions like I did above does not work, you need to trim the beginning and end seperately.

Last edited by Michael Stora; 04-07-2013 at 02:53 AM..
# 3  
Old 03-20-2013
It sounds like you want to just ignore lines that do not have those tags. If the data conveniently has line feeds after every close or all element tag and not after any interesting open element tags, just egrep for those tags. It's not xml, just text filtering. You can use sed, awk or perl to adjust the lines if they do not ffit that mold and the line feeds are not real data. PERL, C++ and JAVA can parse xml, and probably that other p named script language I keep blocking on. XPATH XQUERY sorts of queries rely on real xml parsing.
This User Gave Thanks to DGPickett For This Post:
# 4  
Old 03-21-2013
Code:
$ awk -F'[<>]' ' /tns:name/ || /tns:value/ { print $3 } ' file
AdminOutQueue
WBIA.SMRPSC1.ADOUTQ
AgentTraceLevel
5

This User Gave Thanks to anbu23 For This Post:
# 5  
Old 03-21-2013
thanks for ur reply.
PFA the xml file.
actually i want to extract value this way.
Example:
if i give AdminInQueue in my command it will give back its <tns:value> only. here it will give WBIA.SMRPSC1.ADINQ.
means i want to extract the particular <tns:value> by giving its name only.
and i will store it one variable.

can u please suggest something?
thanks in advance.
# 6  
Old 03-22-2013
One approach is to make tuple lines, where the name and value are in that order on the line with a delimiter between: space, comma, tab, colon, pipe long vertical mark. Then another command can filter the lines that you want, allowing you to use wild cards in your key.
This User Gave Thanks to DGPickett For This Post:
# 7  
Old 03-23-2013
Thanks. Can u pls post the required command for this.
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