Or a variation of the above solution:

use Modern::Perl;

my %hash;

do {chomp; $_ = qq|$_"$hash{$1}"| if /(ID=.+)$/ and ++$hash{$1}; say}
  for <DATA>;

__DATA__
xxxx . yyy 521 916 . + . ID=OSCAR1028v1rpkm9.67

xxxx . xxx 521 567 . + . Parent=OSCAR1028v1rpkm9.67

xxxx . yyy 126 130 . - . ID=OSCAR10281vrpkm9.67

xxxx . xxx 129 130 . - . Parent=OSCAR1028v1rpkm9.67

xxxx . yyy 126 130 . - . ID=OSCAR10281vrpkm9.67

xxxx . xxx 129 130 . - . Parent=OSCAR1028v1rpkm9.67

[download]

Results:

xxxx . yyy 521 916 . + . ID=OSCAR1028v1rpkm9.67"1"

xxxx . xxx 521 567 . + . Parent=OSCAR1028v1rpkm9.67

xxxx . yyy 126 130 . - . ID=OSCAR10281vrpkm9.67"1"

xxxx . xxx 129 130 . - . Parent=OSCAR1028v1rpkm9.67

xxxx . yyy 126 130 . - . ID=OSCAR10281vrpkm9.67"2"

xxxx . xxx 129 130 . - . Parent=OSCAR1028v1rpkm9.67

[download]

In reply to Re: rename duplicate data by Kenosis
in thread rename duplicate data by blacknight

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.