Here is one way to do it. Have a look at perlopentut as well. 
#!/usr/bin/perl -w

use strict;

# Open file for reading and writing (and maybe arithmetic)
open MYFILE, "+>somefile.txt" or die "Error message here: $!\n";

# Write to the file
print MYFILE "These are the days\n";
print MYFILE "and these are the days\n";

# Rewind the file for reading
seek(MYFILE, 0, 0);

while (<MYFILE>) {
    print $_;
}

close MYFILE;

[download]

--
John.

In reply to Re: Writing to file and reading from same file by jmcnamara
in thread Writing to file and reading from same file by basm100

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.