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sub run_command {
    my $user = 'gmon';
...
    $cmd->reader($do_command);
    return $cmd;
}

sub run_command {
    my $user = 'gmon';
...
    open my $fh, "$do_command |";
    return $fh;
}

sub run_command {
    my $user = 'gmon';
...
    my @results = `$do_command`;
    return @results
}