I am extremely new to perl and working on my 1st perl code. I am stuck at a point, where I need to read a part of a file using Tie::File;

My Old code: 
open(LOG_READ,"cat $InLogFilePath|tail -n +$InStartLineNumber|") || di
+e "can not open file :$!";
my @all_lines = <LOG_READ> ;
close (LOG_READ);
for (@all_lines) {.. }

[download]

But this could eat a lot of memory, as the files are huge. So I found Tie::File online, that happens not to load arrays in memory. 1st question, is that correct ?

If yes, I get:

 tie @array, 'Tie::File', $filename or die ...;

But I do not want to read the whole file. Let's say I want to read from line number 100 till end. How do I do it, using Tie::File ? something similar to:

tie @array, 'Tie::File', "cat $InLogFilePath|tail -n +$InStartLineNumber" or die ...;

Looking forward to your help monks :)

In reply to Loading a part of the file to array using Tie::File by ansh007

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.