if ( $opts{log} ) {
    open STDOUT, ">>".$opts{log} or warn "error opening log: $!";
    open STDERR, ">>".$opts{log} or warn "error opening log: $!";
}
else {
    open STDOUT, ">>/dev/null" or warn "error opening /dev/null for writing: $!";
    open STDERR, ">>/dev/null" or warn "error opening /dev/null for writing: $!";
}