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Old 02-23-2011, 06:22 PM   #1
monkeyorhunter
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Registered: Feb 2011
Posts: 10

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sorting data


Hi

I have a large number of text files:

trialdata_1.txt
trialdata_2.txt
.
.
.

each with three columns of numbers

In each file I want to order the rows according to the first column.

So data looking like

1 2 2
2 4 5
8 8 6
6 5 7
9 10 8

would become

1 2 2
2 4 5
6 5 7
8 8 6
9 10 8

my code right now is

#!/usr/bin/perl
my $Input = trialdata_1.txt;
open (Data, "<$Input");
my @data1 = <Data>;
my @data2 = sort {$a <=> $b } @data1;
print @data2;

the two problems I'm having are:

1. How do I adjust the datafile instead of having the desired data printed in my terminal

2. How do I make the code work on multiple files.

Any help would be much appreciated.

Thanks!
 
Old 02-23-2011, 08:54 PM   #2
Tinkster
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Registered: Apr 2002
Location: in a fallen world
Distribution: slackware by choice, others too :} ... android.
Posts: 23,004
Blog Entries: 11

Rep: Reputation: 903Reputation: 903Reputation: 903Reputation: 903Reputation: 903Reputation: 903Reputation: 903Reputation: 903
Silly question, why don't you use "sort" on the commandline?

Code:
for i in trialdata*txt; 
do
    sort -k1,1n $i > ${i}.tmp && mv ${i}.tmp $i
done


Cheers,
Tink

Last edited by Tinkster; 02-23-2011 at 08:58 PM.
 
  


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