You've not run the perl executable for your version, you're still running the version of perl installed with Ubuntu (showing up via the which perl command). Rather than run the command you've changed into the bin directory of your 5.12.2 install and run the 5.10.1 perl executable. Try running the following (exactly):

/opt/perl-5.12.2/bin/perl -V

Update: removed leading . character in the example.

In reply to Re^5: (Help Needed) Uninstall Perl 5.10 and Install 5.8 on Ubuntu 10.04 by marto
in thread (Help Needed) Uninstall Perl 5.10 and Install 5.8 on Ubuntu 10.04 by skumar1

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.