my %Config = read_inifile("$ENV{HOME}/.rsbs2rc");
-my $hostalias;
+my $hostalias = $ARGV[0];
-if (defined($ARGV[0])) {
- $hostalias = $ARGV[0];
-} else {
+if (!defined($hostalias) || !defined($Config{$hostalias})) {
print STDERR "Usage: $0 card-alias\n\n";
print STDERR "card-alias\tone of: ";
foreach my $alias (keys(%Config)) {