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Operating Systems Linux Linux command to find and replace occurance of more than two equal sign with "==" from XML file. Post 302661093 by alister on Sunday 24th of June 2012 06:53:37 PM
Old 06-24-2012
Quote:
Originally Posted by bakunin
... because there is a trick:

Code:
(cat /path/to/file) | sed '<somecommand>' > /path/to/file

This will work for files which are small enough to fit into memory. The downside is, that if anything goes wrong (power loss, reboot, process aborted, ...) your data will be irrevocably destroyed. You sure do not want to use this hack on critical data just to save a few GB of (temporary) diskspace.
That won't work even when there's just a single byte in the file, if the shell first creates the sed portion of the pipeline. There are no guarantees on which component of a pipeline will be created first.

Regards,
Alister
 

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XML(3pm)						User Contributed Perl Documentation						  XML(3pm)

NAME
CGI::XML - Perl extension for converting CGI.pm variables to/from XML SYNOPSIS
use CGI::XML; $q = new CGI::XML; # convert CGI.pm variables to XML $xml = $q->toXML; $xml = $q->toXML($root); # convert XML to CGI.pm variables $q->toCGI($xml); DESCRIPTION
The CGI::XML module converts CGI.pm variables to XML and vice versa. CGI::XML is a subclass of CGI.pm, so it reads the CGI variables just as CGI.pm would. METHODS
$q = new CGI::XML creates a new instance of CGI::XML. You also have access to all of the methods in CGI.pm. $q->toXML([$root]) where $root is an optional parameter that specifies the root element. By default, toXML will not return a root element. $q->toCGI($xml) where $xml is the XML you would like to convert to CGI.pm parameters. Values in the XML will overwrite any existing values if they exist. NOTE
CGI::XML does not currently handle multiple selections passed from HTML forms. This will be added in a future release. AUTHOR
Jonathan Eisenzopf <eisen@pobox.com> CONTRIBUTORS
David Black <dblack@candle.superlink.net> SEE ALSO
perl(1), XML::Parser(3). perl v5.8.8 2004-12-05 XML(3pm)
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