What does this syntax do:

open STDERR, '>&', \*STDOUT'

because this simpler syntax seems to work:

     1  use strict;
     2  use warnings;
     3  use 5.010;
     4
     5  open my $SAVE_STDOUT, '>&', 'STDOUT';  #<--quoted bareword
     6  open STDOUT, '>', 'data1.txt';
     7  say 'hello world';
     8
     9  open my $SAVE_STDERR, '>&', 'STDERR';  #<--quoted bareword
    10  open STDERR, '>', 'errors.txt';
    11  warn "my warning message";
    12
    13  open STDOUT, '>&', $SAVE_STDOUT;
    14  open STDERR, '>&', $SAVE_STDERR;
    15  say 'goodbye';
    16  warn 'my warning message #2';

--output:--
goodbye
my warning message #2 at 2perl.pl line 16.

$cat data1.txt
hello world

$cat errors.txt
my warning message at 2perl.pl line 11.

[download]
EDIT: In fact, I just tried using STDOUT and STDERR as the third argument to open() without quotes around them, and that works too: the output is the same.

In reply to Re^5: Can't close STDIN/STDOUT/STDERR by 7stud
in thread Can't close STDIN/STDOUT/STDERR by brp4h

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.