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Though if you try to re-open C<STDOUT> or C<STDERR> as an "in memory" file, you have to close it first: close STDOUT; open STDOUT, '>', \$variable or die "Can't open STDOUT: $!";
# close STDOUT; # with this it works open STDOUT, ">:encoding(cp37)", "foo.out" or die "Cannot redirect STD +OUT\n"; print "yadda yadda\n";