03-07-2013
There are PERL tutorials on the web that are a fine use of your time, and I am told it is the most versatile tool of all, being midway between c/C++/JAVA and shell/sed/awk. Learning it is a big task for a newcomer to computers, but learning your first language and O/S language interface is a big task regardless.
A tool like sed or sed-like-perl can copy the file, capturing lines (sed h, d) it finds by context (sed /pattern/ and N) and moving them (sed G) to new places it finds by context.
https://www.unix.com/man-page/All/1/sed/
However, the only really robust way to adjust an XML file is to use or create an XML-aware tool. PERL/C++/JAVA have XML parsers that will put the document in memory as a container object (DOM). Once there, you can adjust the content and write a new XML file.
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LEARN ABOUT REDHAT
xml::dom::parser
PARSER(1) User Contributed Perl Documentation PARSER(1)
NAME
XML::DOM::Parser - An XML::Parser that builds XML::DOM document structures
SYNOPSIS
use XML::DOM;
my $parser = new XML::DOM::Parser;
my $doc = $parser->parsefile ("file.xml");
DESCRIPTION
XML::DOM::Parser extends XML::Parser
The XML::Parser module was written by Clark Cooper and is built on top of XML::Parser::Expat, which is a lower level interface to James
Clark's expat library.
XML::DOM::Parser parses XML strings or files and builds a data structure that conforms to the API of the Document Object Model as described
at <http://www.w3.org/TR/REC-DOM-Level-1>. See the XML::Parser manpage for other additional properties of the XML::DOM::Parser class.
Note that the 'Style' property should not be used (it is set internally.)
The XML::Parser NoExpand option is more or less supported, in that it will generate EntityReference objects whenever an entity reference is
encountered in character data. I'm not sure how useful this is. Any comments are welcome.
As described in the synopsis, when you create an XML::DOM::Parser object, the parse and parsefile methods create an XML::DOM::Document
object from the specified input. This Document object can then be examined, modified and written back out to a file or converted to a
string.
When using XML::DOM with XML::Parser version 2.19 and up, setting the XML::DOM::Parser option KeepCDATA to 1 will store CDATASections in
CDATASection nodes, instead of converting them to Text nodes. Subsequent CDATASection nodes will be merged into one. Let me know if this
is a problem.
Using LWP to parse URLs
The parsefile() method now also supports URLs, e.g. http://www.erols.com/enno/xsa.xml. It uses LWP to download the file and then calls
parse() on the resulting string. By default it will use a LWP::UserAgent that is created as follows:
use LWP::UserAgent;
$LWP_USER_AGENT = LWP::UserAgent->new;
$LWP_USER_AGENT->env_proxy;
Note that env_proxy reads proxy settings from environment variables, which is what I need to do to get thru our firewall. If you want to
use a different LWP::UserAgent, you can either set it globally with:
XML::DOM::Parser::set_LWP_UserAgent ($my_agent);
or, you can specify it for a specific XML::DOM::Parser by passing it to the constructor:
my $parser = new XML::DOM::Parser (LWP_UserAgent => $my_agent);
Currently, LWP is used when the filename (passed to parsefile) starts with one of the following URL schemes: http, https, ftp, wais,
gopher, or file (followed by a colon.) If I missed one, please let me know.
The LWP modules are part of libwww-perl which is available at CPAN.
perl v5.8.0 2000-01-31 PARSER(1)