Parsing two files to get matching and non-matching entries

[santhoshs]

Hello

I am required to parse two files that contain email addresses and figure out a way to get the matching and non-matching email addresses from both the files. I was able to get the matching entries by using the following code:

#!/usr/bin/perl
open f1,"file1" or die "cannot open file:$!\n";
open f2,"file2" or die "cannot open file2:$!\n";
open out,">match.out" or die $@;
@file1=<f1>;
@file2 =<f2>;
close f1;close f2;
$count=0;
for($k=0;$k<$#file1;$k++)
{
    #print $file2[$k];
    for($i=0;$i<$#file2;$i++)
    {
        next if(!(lc($file2[$i]) eq lc($file1[$k])));
        print out lc($file1[$k]);
        ++$count;
 
    }
 
}
print "Match: $count entries\n";
close out;    

However, I am sure this is just a quick way out to get the matching entries, as getting the whole content of a file in an array is not the way to go. I would like to be able to manipulate the filehandles as the data comes in from the two files dynamically to get the matching entries.

This is my first post to this forum. Please advise.

Thanks,
Santhosh.

[numberwhun]

Hello

I am required to parse two files that contain email addresses and figure out a way to get the matching and non-matching email addresses from both the files. I was able to get the matching entries by using the following code:

#!/usr/bin/perl
open f1,"file1" or die "cannot open file:$!\n";
open f2,"file2" or die "cannot open file2:$!\n";
open out,">match.out" or die $@;
@file1=<f1>;
@file2 =<f2>;
close f1;close f2;
$count=0;
for($k=0;$k<$#file1;$k++)
{
    #print $file2[$k];
    for($i=0;$i<$#file2;$i++)
    {
        next if(!(lc($file2[$i]) eq lc($file1[$k])));
        print out lc($file1[$k]);
        ++$count;
 
    }
 
}
print "Match: $count entries\n";
close out;    

However, I am sure this is just a quick way out to get the matching entries, as getting the whole content of a file in an array is not the way to go. I would like to be able to manipulate the filehandles as the data comes in from the two files dynamically to get the matching entries.

This is my first post to this forum. Please advise.

Thanks,
Santhosh.

I just want to clarify for my understanding. Are you trying to compare two files and produce 1 file with NO duplicate entries?

Regards,

Jeff

[santhoshs]

I just want to clarify for my understanding. Are you trying to compare two files and produce 1 file with NO duplicate entries?

Regards,

Jeff

Thanks for your quick response, Jeff.

Yes. I would like to have 1 file with NO Duplicate Entries. Also, I would like to know if there's a way to dynamically read from a filehandle during each comparison.

Thanks.