Hello jayu_rao,

Here are two possible solutions:

(1) Create the temporary file using the core module File::Temp and get the filename together with the handle:

use File::Temp 'tempfile';
...
my ($fh, $filename) = tempfile();
my  $bw = File::ReadBackwards->new($filename)
    or die "Cannot read '$filename' backwards";

while (my $log_line = $bw->readline)
{
    ...
}

[download]

(2) Use the File::ReadBackwards TIED HANDLE INTERFACE, which accepts a filehandle:

my $filename = 'data.txt';

open(my $bw, '<', $filename)
    or die "Cannot open file '$filename' for reading";

tie *$bw, 'File::ReadBackwards', $filename
    or die "Cannot read '$filename' backwards";

while (my $log_line = <$bw>)
{
    ...
}

[download]

(Note the asterisk in tie *$bw — this is required. Also note the two different ways of reading the next line from the file: readline vs. <$bw>. N.B.: they are not interchangeable!)

Hope that helps,

Athanasius <°(((>< contra mundum Iustus alius egestas vitae, eros Piratica,

In reply to Re^3: ReadBackwards usage by Athanasius
in thread Readbackwards usage by jayu_rao

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.