how to filter out some paragraphs in a file

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pod::abstract::filter

Pod::Abstract::Filter(3pm)				User Contributed Perl Documentation				Pod::Abstract::Filter(3pm)

NAME

       Pod::Abstract::Filter - Generic Pod-in to Pod-out filter.

DESCRIPTION

       This is a superclass for filter modules using Pod::Abstract. Subclasses should override the "filter" sub. Pod::Abstract::Filter classes in
       the Pod::Abstract::Filter namespace will be used by the "paf" utility.

       To create a filter, you need to implement:

       filter
	   Takes a Pod::Abstract::Node tree, and returns either another tree, or a string. If a string is returned, it will be re-parsed to be
	   input to any following filter, or output directly if it is the last filter in the list.

	   It is recommended your filter method produce a Node tree if you are able to, as this will improve interoperability with other
	   "Pod::Abstract" based software.

       require_params
	   If you want positional arguments following your filter in the style of:

	    paf find [thing] Pod::Abstract

	   then override require_params to list the named arguments that are to be accepted after the filter name.

METHODS

   new
       Create a new filter with the specified arguments.

   require_params
       Override to return a list of parameters that must be provided. This will be accepted in order on the command line, unless they are first
       set using the "-flag=xxx" notation.

   param
       Get the named param. Read only.

   filter
       Stub method. Does nothing, just returns the original tree.

   run
       Run the filter. If $arg is a string, it will be parsed first. Otherwise, the Abstract tree will be used. Returns either a string or an
       abstract tree (which may be the original tree, modified).

AUTHOR

       Ben Lilburne <bnej@mac.com>

COPYRIGHT AND LICENSE

       Copyright (C) 2009 Ben Lilburne

       This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

perl v5.10.1							    2010-01-03						Pod::Abstract::Filter(3pm)

Shell Programming and Scripting