Solved

Is it possible to write a Perl one-liner to get difference between two files?

Posted on 2009-07-13
3
271 Views
Last Modified: 2012-05-07
Have two files test1.txt and test2.txt
test1.txt
AA-A123
AABBCC
123_ABC
XYZ-A01
.....
test2.txt
123_ABC
AABBCC
AA-A123
....
Want to get test1.txt subtracts test2.txt , i.e.
XYZ-A01
You can assume that test2.txt is a part of test1.txt but the order is not necessarily same.
0
Comment
Question by:jl66
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
3 Comments
 
LVL 39

Assisted Solution

by:Adam314
Adam314 earned 150 total points
ID: 24840280
Not a 1-liner, but this works....
##### Remove file1 from @ARGV (process file2 first)
my $f2=shift(@ARGV);
 
##### Read file2
my %file2;
while(<>) {
	chomp;
	$file2{$_}++;
}
 
push @ARGV, $f2;
while(<>) {
	chomp;
	next if $file2{$_};
	print "$_\n";
}

Open in new window

0
 
LVL 84

Accepted Solution

by:
ozo earned 350 total points
ID: 24841645
perl -ne "print unless $s{$_}++||@ARGV" test2.txt test1.txt
0
 

Author Comment

by:jl66
ID: 24856801
Thank both of you very much. I will verify the solutions later.
0

Featured Post

What does it mean to be "Always On"?

Is your cloud always on? With an Always On cloud you won't have to worry about downtime for maintenance or software application code updates, ensuring that your bottom line isn't affected.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Email validation in proper way is  very important validation required in any web pages. This code is self explainable except that Regular Expression which I used for pattern matching. I originally published as a thread on my website : http://www…
In the distant past (last year) I hacked together a little toy that would allow a couple of Manager types to query, preview, and extract data from a number of MongoDB instances, to their tool of choice: Excel (http://dilbert.com/strips/comic/2007-08…
Explain concepts important to validation of email addresses with regular expressions. Applies to most languages/tools that uses regular expressions. Consider email address RFCs: Look at HTML5 form input element (with type=email) regex pattern: T…
Six Sigma Control Plans

630 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question