G'day perlpoda,

Welcome to the monastery.

Without any code or data, you're only going to get vague responses. Follow these guidelines for a better answer: How do I post a question effectively?

Here's a basic technique that does the sort of thing you appear to want: 

$ perl -Mstrict -Mwarnings -E '
my @identified_bad_links = (qw{a c e});
my %bad_link = map { $_ => 1 } @identified_bad_links;
my @all_links = (qw{a b c d e f g});
say $_ for grep { ! $bad_link{$_} } @all_links;
'
b
d
f
g

[download]

-- Ken

In reply to Re: Find & Delete by comparing two files by kcott
in thread Find & Delete by comparing two files by perlpoda

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.