1. From the documentation for Digest::SHA1:

        $sha1->addfile($io_handle)
    [ SNIP ]
            In most cases you want to make sure that the $io_handle is in "binmode" before you pass it as argument to the addfile() method.

  2. OK.    :-)

  3. Typeglobs and Filehandles
    How do I pass filehandles between subroutines?
    How can I use a filehandle indirectly?

  4. $sha1->digest returns a digest in binary form while $sha1->hexdigest is in hexadecimal form. For example:

    $ perl -le'
    my $digest     = "\x02\x07\xFA\x78";
    my $hex_digest = "0207FA78";
    print for length( $digest ), length( $hex_digest );
    '
    4
    8

  5. Update: reset() may or may not speed things up. You would have to compare both methods with Benchmark to be sure.

In reply to Re^3: scalable duplicate file remover by jwkrahn
in thread scalable duplicate file remover by spx2

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.