I found this bit of code that parse the first column of two text files checks the first column of the first file and then examines the second file to find and remove duplicates. as I am brand new to Perl my question is this: How to I update the code to specify which is the first file to be examined and which is the second file to have duplicates removed? Thank you in advance for the help! 
#!/usr/bin/perl

# create names lookup table from first file
my %names;
while (<>) {
    (my $col1)= split / /, $_;
    $names{$col1} = 1;
    last if eof;
}

# scan second file
while (<>) {
    print if /^(\S+).*/ && not $names{$1};
}

[download]

In reply to Examine two files to delete duplicates by Coop197823

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.