Please put <code> and </code> around your perl snippet and data samples.

You have a good start on reading the first file. Now you just need to use the same hash when reading the second file, and do: 

    $file1{$word}{$site} += $count;

[download]
instead of just the straight "=" assignment. That will make sure that when the second file contains a "word" and "site" combination that was also in the first file, you'll be adding together the two "count" values.

You should also start with use strict; and it will make sense to have your file reading logic in a subroutine that you call for each file, just to avoid repeating code unnecessarily: 

use strict;

my %data;
my @filenames = ...;  # @ARGV or literal strings or whatever

for my $fname ( @filenames ) {
    open my $input, "<", $fname or die "$fname: $!";
    load_data( $input, \%data );
}

# doing stuff with %data is left as an exercise...

sub load_data
{
     my ( $fh, $href ) = @_;
     while ( <$fh> ) {
        next unless ( s/^(.*?):\s*// );
        my $word = $1;
        for my $field ( split ) {
            my ( $site, $count ) = split /,/, $field;
            $$href{$word}{$site} += $count;
        }
    }
}

[download]
(not tested)

In reply to Re: merge two files by graff
in thread merge two files by karey3341

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.