Updated
Hi,

After consulting the Cookbook (16.7), I've written the following sub. 
sub TestRadiusAuth
{
    my $cmd = "$radclient" .
        " -t $radius_config->{auth_timeout}" .
        " -r $radius_config->{auth_retries}" .
        " -i 1 $radius_config->{ip}:$radius_config->{auth_port}" .
        " auth $radius_config->{secret} <<EOF\n" .
        "User-Name = \"$test_user\"\n" .
        "Password = \"$test_pass\"\n" .
        "NAS-IP-Address = \"$eth0\"\n" .
        "EOF\n";
    my $response;
    open(CMD, "$cmd 2>&1 |") or die "Could not execute $cmd:$!\n";
    while (<CMD>)
    {
        chomp();
        return (1,$_) if /Session-Timeout/;
        $response .= $_;
    }
    return (0,$response);
}

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My problem is that the redirection (2>&1) within the piped open does not work as expected. If I deliberately force $cmd to return an error, it still comes to _my_ STDERR, rather than the STDOUT of the CMD filehandle.

I figure that I'm doing something fundamentally stupid, but I can't see it for the life of me.
Would appreciate any advice.

In reply to Capturing STDERR from a piped open by McDarren

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