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Re: File Manipulation - Need Advise!

by Codon (Friar)
on Jan 03, 2008 at 18:57 UTC ( #660296=note: print w/ replies, xml ) Need Help??


in reply to File Manipulation - Need Advise!

You didn't mention this, but if order matters in some way, you would might want two data structures, one to unique the output (a hash) and one to maintain ordering (an array). I don't know if you have seen this with the previous examples, but the header line could get mixed into the file somewhere (randomly, thanks to the hashing algorithm) unless handled separately. Alternatively, I provide this quick example:

#!/usr/bin/perl use strict; use warnings; my @order; my %data; while (<DATA>) { my ($key,$value) = split /\t/, $_, 2; push @order, $key; $data{$key} = $value; } for my $key (@order) { printf("%s\t%s", $key, delete $data{$key}) if ($data{$key}); } __DATA__ COMPUTER DISTRIBUTION_ID STATUS 30F-WKS `1781183799.xxxx1' IC--- 30F-WKS `1781183799.xxx11' IC--- ADM34A3F9 `1781183799.41455' IC---
Ivan Heffner
Sr. Software Engineer
WhitePages.com, Inc.


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