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Top Forums Shell Programming and Scripting To remove duplicates from pipe delimited file Post 302865857 by drl on Sunday 20th of October 2013 07:35:17 AM
Old 10-20-2013
Hi.

We once needed a code that would run on a number of different systems, yet produce consistent results. We ran into the situation that utility uniq was not consistent among the systems. We introducing an option:
Code:
--last
allows over-writing, effectively keeping the most-recently
seen instance. Some versions of uniq on other *nix systems use
the most recent (Solaris), the default is compatibility with
GNU/Linux uniq, which keeps the first occurrence.

By substituting this idea for the system version of uniq, we were able to produce consistent results.

I think this problem can approached with the sort idea of danmero, but with the stable option set, and a "final filter" that eliminates duplicates. Because the file is already sorted, no additional storage is needed: in the final filter, if the fields of the incoming record differ from that in storage, then write out the saved line, and save the new line. If the fields are the same, then save the new instance of the line. Our code was in perl, but awk could be as easily used.

Best wishes ... cheers, drl

Last edited by drl; 10-20-2013 at 08:44 AM..
 

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

NAME
Regexp::Common::delimited -- provides a regex for delimited strings SYNOPSIS
use Regexp::Common qw /delimited/; while (<>) { /$RE{delimited}{-delim=>'"'}/ and print 'a " delimited string'; /$RE{delimited}{-delim=>'/'}/ and print 'a / delimited string'; } 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{delimited}{-delim}{-esc} Returns a pattern that matches a single-character-delimited substring, with optional internal escaping of the delimiter. When "-delim=S" is specified, each character in the sequence S is a possible delimiter. There is no default delimiter, so this flag must always be specified. If "-esc=S" is specified, each character in the sequence S is the delimiter for the corresponding character in the "-delim=S" list. The default escape is backslash. For example: $RE{delimited}{-delim=>'"'} # match "a " delimited string" $RE{delimited}{-delim=>'"'}{-esc=>'"'} # match "a "" delimited string" $RE{delimited}{-delim=>'/'} # match /a / delimited string/ $RE{delimited}{-delim=>q{'"}} # match "string" or 'string' Under "-keep" (See Regexp::Common): $1 captures the entire match $2 captures the opening delimiter (provided only one delimiter was specified) $3 captures delimited portion of the string (provided only one delimiter was specified) $4 captures the closing delimiter (provided only one delimiter was specified) $RE{quoted}{-esc} A synonym for $RE{delimited}{q{-delim='"`}{...}} 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 v5.16.2 2010-02-23 Regexp::Common::delimited(3)
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