I want to have any data that would go to STDOUT, STDERR, STDIN to go to a variable. (Ideally just one variable by duping the file handles, but will settle for something close to what I have here.) What am I doing wrong here? I was expecting to get the error from the bad "system" call. 
#!/usr/bin/perl

use strict;
use warnings;

close(STDOUT);
close(STDIN);
close(STDERR);

my $strout;
my $strin;
my $strerr;

open(STDOUT, "+<", \$strout) or die;
open(STDIN,  "+<", \$strin)  or die;
open(STDERR, "+<", \$strerr) or die;

print STDOUT "Hello this is 1 stdout\n";
print STDERR "Hello this is 1 stderr\n";
print STDIN  "Hello this is 1 stdin\n";

system("fin . -name asasdasdasd");

print STDOUT "Hello this is 2 stdout\n";
print STDERR "Hello this is 2 stderr\n";
print STDIN  "Hello this is 2 stdin\n";


close(STDOUT);
close(STDIN);
close(STDERR);

open(LOG, ">log") or die;
print LOG $strout, $strin, $strerr;
close(LOG);

[download]
cat log
Hello this is 1 stdout
Hello this is 2 stdout
Hello this is 1 stdin
Hello this is 2 stdin
Hello this is 1 stderr
Hello this is 2 stderr

[download]

In reply to printing to a scalar -- STDIN, STDOUT, STDERR by Jack B. Nymbol

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.