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Full Discussion: Overriding XML File
Top Forums Shell Programming and Scripting Overriding XML File Post 302513603 by DGPickett on Wednesday 13th of April 2011 05:06:32 PM
Old 04-13-2011
Well, it is a sort of join, but for only 10 or so, generate the sed script from that file, then run it on the other, longer file. You can write the sed substitutes in sed. Note, writing code that writes code makes you no longer a newby, if you succeed.

There might be tools that can interpret both files in SQL and do the join, but cartesian join is slow. UNIX join can do this, too. Sorted merge is nicer, like a many to one sorted join. I wrote a tool for that, like join, but pipe friendly and exploiting knowing file a is always the many side. Google for m1join.c; I think it is in here somewhere.

Finally, some tools like bash, awk have what I call associative arrays, really two column tables so you can look up using a unique key a string, with loading syntax something like: xtable["ardvark"]="First animal." You can load file 2 into such a container and then use it to decide what to substitute. If the shell uses a nice algorythm like hash map or tree, or the set is small, the performance can be good.

Joins - just the start!
 

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XML::Handler::CanonXMLWriter(3) 			User Contributed Perl Documentation			   XML::Handler::CanonXMLWriter(3)

NAME
XML::Handler::CanonXMLWriter - output XML in canonical XML format SYNOPSIS
use XML::Handler::CanonXMLWriter; $writer = XML::Handler::CanonXMLWriter OPTIONS; $parser->parse(Handler => $writer); DESCRIPTION
"XML::Handler::CanonXMLWriter" is a PerlSAX handler that will return a string or write a stream of canonical XML for an XML instance and it's content. "XML::Handler::CanonXMLWriter" objects hold the options used for writing the XML objects. Options can be supplied when the the object is created, $writer = new XML::Handler::CanonXMLWriter PrintComments => 1; or modified at any time before calling the parser's `"parse()"' method: $writer->{PrintComments} = 0; OPTIONS
IOHandle IOHandle contains a handle for writing the canonical XML to. If an IOHandle is not provided, the canonical XML string will be returned from `"parse()"'. PrintComments By default comments are not written to the output. Setting comment to a true value will include comments in the output. AUTHOR
Ken MacLeod, ken@bitsko.slc.ut.us SEE ALSO
perl(1), PerlSAX James Clark's Canonical XML definition <http://www.jclark.com/xml/canonxml.html> perl v5.16.3 2003-10-21 XML::Handler::CanonXMLWriter(3)
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