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Top Forums Shell Programming and Scripting Sed insert text at first line of empty file Post 302497747 by Ygor on Friday 18th of February 2011 01:39:50 AM
Old 02-18-2011
I think sed only works on lines. A zero-byte file has no lines, so that could be the problem.
 

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HTTP::Proxy::BodyFilter::lines(3pm)			User Contributed Perl Documentation		       HTTP::Proxy::BodyFilter::lines(3pm)

NAME
HTTP::Proxy::BodyFilter::lines - A filter that outputs only complete lines SYNOPSIS
use HTTP::Proxy::BodyFilter::lines; use MyFilter; # this filter only works on complete lines my $filter = MyFilter->new(); # stack both filters so that they'll handle text/* responses $proxy->push_filter( mime => 'text/*', response => HTTP::Proxy::BodyFilter::lines->new, response => $filter ); # I want my lines to end with '!' # This is equivalent to $/ = '!' in a normal Perl program my $lines = HTTP::Proxy::BodyFilter::lines->new('!'); DESCRIPTION
The HTTP::Proxy::BodyFilter::lines filter makes sure that the next filter in the filter chain will only receive complete lines. The "chunks" of data received by the following filters with either end with " " or will be the last piece of data for the current HTTP message body. You can change the idea the filter has of what is a line by passing to its constructor the string it should understand as line ending. " " is the default value. my $filter = HTTP::Proxy::BodyFilter::lines->new( $sep ); This is similar to modifying $/ in a Perl program. In fact, this filter has a behaviour so similar to modifying $/ that it also knows about "paragraph mode" and "record mode". Note that the "slurp" mode is not supported. Please use HTTP::Proxy::BodyFilter::complete to enable the generic store and forward filter mechanism. METHODS
This filter defines the following methods, which are automatically called: init() Initialise the filter with the EOL information. filter() Keeps unfinished lines for later. will_modify() This method returns a false value, thus indicating to the system that it will not modify data passing through. SEE ALSO
HTTP::Proxy, HTTP::Proxy::BodyFilter. AUTHOR
Philippe "BooK" Bruhat, <book@cpan.org>. COPYRIGHT
Copyright 2003-2006, Philippe Bruhat. LICENSE
This module is free software; you can redistribute it or modify it under the same terms as Perl itself. perl v5.12.4 2011-07-03 HTTP::Proxy::BodyFilter::lines(3pm)
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