rename "output.new","output.old";
...
diff "output.new", "output.old", ...

[download]

If the rename call succeeded (you should really check that, or use autodie), then output.new doesn't exist anymore. I guess that diff just treats is as empty, which is why it shows you that the whole contents of the second file as output (the diff is really the whole file).

Also it seems odd to me that once you compare 1.log and 2.log, and then based on the result of that comparison, you report the difference between two different files. But you might have your reasons for that.

Perl 6 - second systems done right

In reply to Re: Text::Diff help by moritz
in thread Text::Diff help by whittick

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.