Unfortunately I do not know what the starting line numbers are. I have 3 GB file and I can not put it into a big array. The example above is extremely simplified example. I might have element 10 (which is first number in the line) and 20 lines starting with that number , The next number might be 10000 and I might have 20 lines starting with that number. I might have 20000 elements, which means 20000 different elements and 20000 * 20 lines (lets say there are 20 lines starting with the same element number). Basically I just would not know what the element numbers are. I need to find out as I am going through the file.

In reply to Re: Re: How can I read multiple lines starting with the same number and put in to a nested array and print it to a file? by Anonymous Monk
in thread How can I read multiple lines starting with the same number and put in to a nested array and print it to a file? by opolat

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.