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Home: Need a Custom or Prewritten Perl Program?: I need a program that...:
concatenate files

 


shezam
New User

Jun 18, 2009, 9:04 AM

Post #1 of 7 (4689 views)
concatenate files Can't Post
I want to write a little piece of perl that will take file1.txt, and file2.txt and concatenate them using /del as the delimiter.

So how would i do this?, read file1.txt, append /del at after last line and then append file2.txt after that.

All suggestions appreciated! Thanks!


perllearner
Novice

Jul 24, 2009, 6:00 AM

Post #2 of 7 (4520 views)
Re: [shezam] concatenate files [In reply to] Can't Post
Hi,

Even its a late response, i would like to share this program to you.

#!/usr/bin/perl
use strict;

my @file1=`cat /ahome/irsadmin/anbu/perlmechanic/file1`;
my @file2=`cat /ahome/irsadmin/anbu/perlmechanic/file2`;
my @combination1;
`rm -rf /ahome/irsadmin/anbu/perlmechanic/joinfile`;
open(OUTPUT,">>/ahome/irsadmin/anbu/perlmechanic/joinfile") || die "cannot create file";
for(my $i=0;$i<$#file1;$i++)
{
chomp $file1[$i];
chomp $file2[$i];
$combination1[$i]=join "", $file1[$i], "/del", $file2[$i];
chomp $combination1[$i];
#$combination2[$i]=join($combination1[$i],$file2[$i]);
print OUTPUT "$combination1[$i] \n";
}
close OUTPUT;


FishMonger
Veteran / Moderator

Jul 24, 2009, 7:16 AM

Post #3 of 7 (4516 views)
Re: [perllearner] concatenate files [In reply to] Can't Post
Why are shelling out to cat?

That script has to be one of the most inefficient method and doesn't accomplish the requirements.


KevinR
Veteran


Jul 24, 2009, 4:00 PM

Post #4 of 7 (4505 views)
Re: [FishMonger] concatenate files [In reply to] Can't Post
In Reply To
Why are shelling out to cat?

That script has to be one of the most inefficient method and doesn't accomplish the requirements.
Maybe the nick "perllearner" explains why. Wink
-------------------------------------------------


perllearner
Novice

Jul 24, 2009, 8:30 PM

Post #5 of 7 (4496 views)
Re: [KevinR] concatenate files [In reply to] Can't Post
Sorry if I had coded anything wrong. And since I had shell in my system I used this method. If anyone knows any alternate method for reading the contents of a file and storing it in an array, kndly post it so that it would be helpful.



Thanks..


ichi
User

Jul 25, 2009, 7:45 AM

Post #6 of 7 (4492 views)
Re: [shezam] concatenate files [In reply to] Can't Post
In Reply To
I want to write a little piece of perl that will take file1.txt, and file2.txt and concatenate them using /del as the delimiter.

So how would i do this?, read file1.txt, append /del at after last line and then append file2.txt after that.

All suggestions appreciated! Thanks!
Code
perl -ne '(eof)?print "$_\n/del\n":print' file1 file2


ichi
User

Jul 25, 2009, 7:48 AM

Post #7 of 7 (4491 views)
Re: [perllearner] concatenate files [In reply to] Can't Post
In Reply To
Sorry if I had coded anything wrong. And since I had shell in my system I used this method. If anyone knows any alternate method for reading the contents of a file and storing it in an array, kndly post it so that it would be helpful.



Thanks..
no , its not wrong to shell out and call these tools. BUT, since you are using Perl, which is a "powerful" language, all the capabilities of shell tools , Perl can provide. So why not do everything in Perl. it makes your Perl code portable to windows machines (etc) as well...i suggest you read up on Perl's doc to familiarize yourself more ...


(This post was edited by ichi on Jul 25, 2009, 7:49 AM)

 
 


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