Actually I've got a login, but sometimes I refrain because monks will get annoyed at how many times I post a question...lol. Anyway, please tell me where you get lost in my post so I can get better at writing these situations.

Now, let me explain in detail what's happening.

@data is read from a file containg many rows such as:
1,comp1,type1
2,comp2,type2
3,comp3,type3

@data2 is read from a file containing many rows such as:
1,comp1,type1,doc1,ref1
2,comp2,type2,doc2,ref2
3,comp3,type3,doc3,ref3
4,comp4,type4,doc4,ref4
5,comp5,type5,doc5,ref5

Using this code:
{
    my %data;
    undef @data{@data};
    foreach ( @data2 ) {
        print "This $_ was not found.\n"
            if not exists $data{$_}
    }
}

[download]

it matches all five values from each line in @data2 to all 3 values in @data line by line. So basically every line in @data2 gets printed when that script is run. What I want to do is match the first value from @data2 to the first value from @data and return the results based on values in @data2 that are not in @data.

I also want to know how I can match the second value from @data2 to the first value in @data and return the results that are not in @data.

I hope this makes better senses. I'll keep trying if it doesn't. Thanks for all your help.

In reply to Re: Re: Re: Re: Re: Re: grepping by Anonymous Monk
in thread grepping by Anonymous Monk

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.