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Full Discussion: How to change a file's content by row?
Top Forums Shell Programming and Scripting How to change a file's content by row? Post 302376160 by rdcwayx on Monday 30th of November 2009 07:56:12 PM
Old 11-30-2009
Quote:
Originally Posted by dennis.jacob
Try tac command if you are on Linux.

or Try:

Code:
awk '!(A[i++]=$0); END { while(i--) print A[i] }'  file

Don't understand why put ! in awk,

Code:
awk '{A[i++]=$0} END { while(i--) print A[i] }' urfile

learn from dennis.jacob by using NR.

Code:
awk  '{A[NR]=$0} END {NR++; while (NR--) print A[NR]}' urfile

 

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LEARN ABOUT DEBIAN

mason::plugin::defer

Mason::Plugin::Defer(3pm)				User Contributed Perl Documentation				 Mason::Plugin::Defer(3pm)

NAME

       Mason::Plugin::Defer - Defer computing parts of output until the end of the request

SYNOPSIS

	   <head>
	   <title><% $m->defer(sub { $m->page->title }) %></title>

	   % $.Defer {{
	   %   my $content = join(", ", @{ $m->page->meta_content });
	   <meta name="description" content="<% $content %>">
	   % }}

	   <body>
	   ...

DESCRIPTION

       The defer feature allows sections of output to be deferred til the end of the request. You can set up multiple deferred code blocks which
       will execute and insert themselves into the output stream at request end.

REQUEST METHOD

       defer (code)
	   Returns a marker string that is unique and will not appear in normal output. At the end of the request, each marker string is replaced
	   with the output of its associated code. e.g.

	       <title><% $m->defer(sub { $m->page->title }) %></title>

FILTER

       Defer
	   Applies "$m->defer" to the content block. e.g.

	       % $.Defer {{
	       %   my $content = join(", ", @{ $m->page->meta_content });
	       <meta name="description" content="<% $content %>">
	       % }}

SEE ALSO

       Mason

AUTHOR

       Jonathan Swartz <swartz@pobox.com>

COPYRIGHT AND LICENSE

       This software is copyright (c) 2011 by Jonathan Swartz.

       This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.

perl v5.14.2							    2012-05-02						 Mason::Plugin::Defer(3pm)
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