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Full Discussion: Grep Headers
Top Forums UNIX for Dummies Questions & Answers Grep Headers Post 302353651 by bakunin on Tuesday 15th of September 2009 09:59:54 PM
Old 09-15-2009
The header is always in the first (or first two, if you want to include the separator) line(s) and there is a special command for printing the first <n> lines of a data stream: "head -<n> ". So you could get your desired output with two commands:

Code:
head -2 <file>
grep "<your-filter>" <file>

Still, this is a invocation of two separate commands and it will be more performant if you could combine it to one command. Actually "sed" is able to do this:

Code:
sed -n '1,2p;/<your_filter>/p' <file>

The second variant has the additional advantage of being fit to be used in a pipeline, whereas in the first variant you would have to deal with "tee" to create several output streams for the different tools:

Code:
process_creating_output | sed -n '1,2p;/<your_filter>/p'

I hope this helps.

bakunin
 

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LEARN ABOUT OSX

svn::dump::reader

SVN::Dump::Reader(3)					User Contributed Perl Documentation				      SVN::Dump::Reader(3)

NAME

       SVN::Dump::Reader - A Subversion dump reader

SYNOPSIS

	   # !!! You should use SVN::Dump, not SVN::Dump::Reader !!!

	   use SVN::Dump::Reader;
	   my $reader = SVN::Dump::Reader( $fh );
	   my $record = $reader->read_record();

DESCRIPTION

       The "SVN::Dump::Reader" class implements a reader object for Subversion dumps.

METHODS

       The following methods are available:

       new( $fh )
	   Create a new "SVN::Dump::Reader" attached to the $fh filehandle.

       read_record( )
	   Read and return a new SVN::Dump::Record object from the dump filehandle.

       read_header_block( )
	   Read and return a new SVN::Dump::Headers object from the dump filehandle.

       read_property_block( )
	   Read and return a new SVN::Dump::Property object from the dump filehandle.

       read_text_block( )
	   Read and return a new SVN::Dump::Text object from the dump filehandle.

       The "read_..." methods will die horribly if asked to read inconsistent data from a stream.

SEE ALSO

       SVN::Dump, SVN::Dump::Headers, SVN::Dump::Property, SVN::Dump::Text.

COPYRIGHT &; LICENSE
       Copyright 2006 Philippe 'BooK' Bruhat, All Rights Reserved.

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

perl v5.10.0							    2008-06-12						      SVN::Dump::Reader(3)
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