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Top Forums Shell Programming and Scripting return a list of unique values of a column from csv format file Post 302361294 by daptal on Monday 12th of October 2009 11:39:06 PM
Old 10-13-2009
Code:
 cat abc.csv
SNP, SampleID, Allele1, Allele2
A001,AB1,A,A
A002,AB1,A,A
A003,AB1,A,A

Instead of abc.csv substitute your csv file name
Code:
$ cat abc.csv  | cut -f1 -d , | uniq
SNP
A001
A002
A003

HTH,
PL
 

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Heap::Elem::Num(3pm)					User Contributed Perl Documentation				      Heap::Elem::Num(3pm)

NAME
Heap::Elem::Num - Numeric Heap Elements SYNOPSIS
use Heap::Elem::Num( NumElem ); use Heap::Fibonacci; my $heap = Heap::Fibonacci->new; my $elem; foreach $i ( 1..100 ) { $elem = NumElem( $i ); $heap->add( $elem ); } while( defined( $elem = $heap->extract_top ) ) { print "Smallest is ", $elem->val, " "; } DESCRIPTION
Heap::Elem::Num is used to wrap numeric values into an element that can be managed on a heap. The top of the heap will have the smallest element still remaining. (See Heap::Elem::NumRev if you want the heap to always return the largest element.) The details of the Elem interface are described in Heap::Elem. The details of using a Heap interface are described in Heap. AUTHOR
John Macdonald, john@perlwolf.com COPYRIGHT
Copyright 1998-2007, O'Reilly & Associates. This code is distributed under the same copyright terms as perl itself. SEE ALSO
Heap(3), Heap::Elem(3), Heap::Elem::NumRev(3). perl v5.8.8 2007-10-23 Heap::Elem::Num(3pm)
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