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Top Forums Shell Programming and Scripting Find and update line in xml file Post 302921962 by brichigo on Tuesday 21st of October 2014 11:12:25 AM
Old 10-21-2014
Find and update line in xml file

Hi,

I have a xml file that I need to modify 1 line to change some value from 2 to 10 (or any number).

Sample input:
Code:
<!-- some text here>
.
.
.
<message:test name="ryan">
     <message:sample-channel charset="UTF-8" max-value="2" wait="20">
         <message:sample>test123</message:sample>
     </message:sample-channel>
</message:test>

Basically, I only need to update the max-value from 2 to any number (i.e. 10). However, there are multiple occurrences of the ff line in the xml.
Code:
<message:sample-channel charset="UTF-8" max-value="2" wait="20">

The only unique line that can be used as pattern is '<message:test name="ryan">'

Is there a sed or awk command that can be used to update the max-value?
 

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IPTABLES-XML(8) 														   IPTABLES-XML(8)

NAME
iptables-xml -- Convert iptables-save format to XML SYNOPSIS
iptables-xml [-c] [-v] DESCRIPTION
iptables-xml is used to convert the output of iptables-save into an easily manipulatable XML format to STDOUT. Use I/O-redirection pro- vided by your shell to write to a file. -c, --combine combine consecutive rules with the same matches but different targets. iptables does not currently support more than one target per match, so this simulates that by collecting the targets from consecutive iptables rules into one action tag, but only when the rule matches are identical. Terminating actions like RETURN, DROP, ACCEPT and QUEUE are not combined with subsequent targets. -v, --verbose Output xml comments containing the iptables line from which the XML is derived iptables-xml does a mechanistic conversion to a very expressive xml format; the only semantic considerations are for -g and -j targets in order to discriminate between <call> <goto> and <nane-of-target> as it helps xml processing scripts if they can tell the difference between a target like SNAT and another chain. Some sample output is: <iptables-rules> <table name="mangle"> <chain name="PREROUTING" policy="ACCEPT" packet-count="63436" byte-count="7137573"> <rule> <conditions> <match> <p>tcp</p> </match> <tcp> <sport>8443</sport> </tcp> </conditions> <actions> <call> <check_ip/> </call> <ACCEPT/> </actions> </rule> </chain> </table> </iptables-rules> Conversion from XML to iptables-save format may be done using the iptables.xslt script and xsltproc, or a custom program using libxsltproc or similar; in this fashion: xsltproc iptables.xslt my-iptables.xml | iptables-restore BUGS
None known as of iptables-1.3.7 release AUTHOR
Sam Liddicott <azez@ufomechanic.net> SEE ALSO
iptables-save(8), iptables-restore(8), iptables(8) Jul 16, 2007 IPTABLES-XML(8)
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