There's something which you are obviously missing. Let's see if I can explain this in such a way as the penny drops.

use strict;
use warnings;

$| = 1;
my $filename = 'foo.txt';
open (FH, '>', $filename) or die "cannot open $filename for writing: $
+!";
my $wasout = select FH;
print "In the file!\n"; # Here you print on FH which is open for writi
+ng. No problem.
close FH;

print "OMG, a warning!\n"; # Here you print on FH but it is closed so 
+a warning is shown

select $wasout;

print "Sweetness and light.\n"; # Here you print on STDOUT again - no 
+warning. Joy!
exit;

[download]

The above code generates only 1 warning (intentionally as an illustration for you). See select for all the good stuff. When you run this code you will see this on the terminal:

print() on closed filehandle FH at sel.pl line 11.
Sweetness and light.

[download]

and this in foo.txt:

In the file!

[download]

Is it all clear now?

It's also worth noting that using a bareword (or other global) filehandle is rarely considered best practice in these modern times so that might be the next thing you could change.

Update: Fix in diagnostic for open: s/read/writ/ (thanks soonix for spotting).

In reply to Re^5: print() on closed filehandle WRITE_FH by hippo
in thread print() on closed filehandle WRITE_FH by TonyNY

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.