Beefy Boxes and Bandwidth Generously Provided by pair Networks
P is for Practical

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, Inc.

Comment on Re: File Manipulation - Need Advise!
Download Code

Log In?

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://660296]
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others chilling in the Monastery: (5)
As of 2015-10-04 12:12 GMT
Find Nodes?
    Voting Booth?

    Does Humor Belong in Programming?

    Results (102 votes), past polls