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Top Forums Shell Programming and Scripting Sort data by date first and then remove duplicates Post 302810225 by samrat dutta on Tuesday 21st of May 2013 12:12:09 PM
Old 05-21-2013
Sort data by date first and then remove duplicates

Hi ,
I have below data inside a file named ref.psv . I want to create a shell script which will do the below 2 points :
(1) sort the file content first based on the latest date which is the last column in the file (actual file its the 175th column)
(2)after sorting the file based on latest date , remove the duplicates based on the first column only

15277105||Common Stick|ESHR||Common Stock|CYRO AB|2013-05-14T00:52:31.662-04:00

16111278||Common Stick|ESHR||Common Stock|STANDARD REGISTER CO|2013-05-14T00:52:31.672-04:00

15277105||Common Stick|ESHR||Common Stock|CYRO AB|2013-05-15T00:52:31.672-04:00

39693766||Common Stick|ESHR||Common Stock|HS AG|2013-05-15T00:52:31.672-04:00

Any help with the script is requested .
thanks,
Sam
 

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Regexp::Common::whitespace(3)				User Contributed Perl Documentation			     Regexp::Common::whitespace(3)

NAME
Regexp::Common::whitespace -- provides a regex for leading or trailing whitescape SYNOPSIS
use Regexp::Common qw /whitespace/; while (<>) { s/$RE{ws}{crop}//g; # Delete surrounding whitespace } DESCRIPTION
Please consult the manual of Regexp::Common for a general description of the works of this interface. Do not use this module directly, but load it via Regexp::Common. $RE{ws}{crop} Returns a pattern that identifies leading or trailing whitespace. For example: $str =~ s/$RE{ws}{crop}//g; # Delete surrounding whitespace The call: $RE{ws}{crop}->subs($str); is optimized (but probably still slower than doing the s///g explicitly). This pattern does not capture under "-keep". SEE ALSO
Regexp::Common for a general description of how to use this interface. AUTHOR
Damian Conway (damian@conway.org) MAINTAINANCE
This package is maintained by Abigail (regexp-common@abigail.be). BUGS AND IRRITATIONS
Bound to be plenty. For a start, there are many common regexes missing. Send them in to regexp-common@abigail.be. LICENSE and COPYRIGHT This software is Copyright (c) 2001 - 2009, Damian Conway and Abigail. This module is free software, and maybe used under any of the following licenses: 1) The Perl Artistic License. See the file COPYRIGHT.AL. 2) The Perl Artistic License 2.0. See the file COPYRIGHT.AL2. 3) The BSD Licence. See the file COPYRIGHT.BSD. 4) The MIT Licence. See the file COPYRIGHT.MIT. perl v5.18.2 2013-03-08 Regexp::Common::whitespace(3)
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