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Top Forums UNIX for Advanced & Expert Users help with !(tail -2) command.. using pipes Post 62356 by sdlayeeq on Tuesday 15th of February 2005 10:31:37 AM
Old 02-15-2005
Network help with !(tail -2) command.. using pipes

I am trying to using pipe (|) with ! (not) operator to list all the other files except the latest two and I am using the following command.

$ ls -ltr *.lst|!(tail -2)
ksh: 20050211180252.lst: cannot execute

but it is trying to execute the file returned by tail -2. I am able to do that in 4 steps

1) ls -ltr *.lst > listfile
2) numberoflines=`wc -l | cut -d" "`
3) ((numberoflines = numberoflines - 2))
4) head -$numberoflines > final_list.

Are there any Unix gurus who could help me write the above commands using pipe facility. I am using Korn shell.

thanks in advance
 

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CHI::Driver::RawMemory(3pm)				User Contributed Perl Documentation			       CHI::Driver::RawMemory(3pm)

NAME
CHI::Driver::RawMemory - In-process memory cache that stores direct references VERSION
version 0.54 SYNOPSIS
use CHI; my $hash = {}; my $cache = CHI->new( driver => 'RawMemory', datastore => $hash ); my $cache = CHI->new( driver => 'RawMemory', global => 1 ); DESCRIPTION
This is a subclass of CHI::Driver::Memory that stores references to data structures directly instead of serializing / deserializing. This makes the cache faster at getting and setting complex data structures, but unlike most drivers, modifications to the original data structure will affect the data structure stored in the cache, and vica versa. e.g. my $cache = CHI->new( driver => 'Memory', global => 1 ); my $lst = ['foo']; $cache->set('key' => $lst); # serializes $lst before storing $cache->get('key'); # returns ['foo'] $lst->[0] = 'bar'; $cache->get('key'); # returns ['foo'] my $cache = CHI->new( driver => 'RawMemory', global => 1 ); my $lst = ['foo']; $cache->set('key' => $lst); # stores $lst directly $cache->get('key'); # returns ['foo'] $lst->[0] = 'bar'; $cache->get('key'); # returns ['bar']! CONSTRUCTOR OPTIONS
Same as CHI::Driver::Memory. SIZE AWARENESS
For the purpose of size-awareness, all items count as size 1 for this driver. (Because data structures are not serialized, there's no good way to determine their size.) # Keep a maximum of 10 items in cache # my $cache = CHI->new( driver => 'RawMemory', datastore => {}, max_size => 10 ); ACKNOWLEDGEMENTS
Thanks to Yuval Kogman whose Cache::Ref inspired me to do this. SEE ALSO
CHI::Driver::Memory, CHI 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 2012-05-30 CHI::Driver::RawMemory(3pm)
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