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Top Forums Shell Programming and Scripting Help with shell script to extract data from XML file Post 302232088 by fpmurphy on Wednesday 3rd of September 2008 09:50:34 PM
Old 09-03-2008
Rather than using grep, sed or awk to transform the XML into the required output, it is better to use an XSLT processor.

If you have (Gnome) libxsl/libxslt installed, it comes with xsltproc a command line interface to a XSLT v1.0 compliant processor.

Here is a stylesheet which performs the required transformation using xsltproc:
Code:
$ cat file.xsl
<?xml version="1.0"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">

<xsl:output method="text" omit-xml-declaration="yes" />

<xsl:template match="id">
    <xsl:value-of select="@v"/><xsl:text>&#xa;</xsl:text>
</xsl:template>

<xsl:template match="/">
  <xsl:apply-templates select="/wfregistry/completedworkflows/id" />
</xsl:template>

</xsl:stylesheet>

$ xsltproc file.xsl file.xml
3381
3399
3415
3431
3447
3463
3479
3495
3511
3527
3543
3559
3575
3591
3607
$

 

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IPTABLES-XML(1) 						  iptables 1.4.21						   IPTABLES-XML(1)

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) iptables 1.4.21 IPTABLES-XML(1)
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