static string GetCommand (string arg)
{
if ((arg == null) || (arg.Length < 1))
return null;
switch (arg [0]) {
case '/':
return arg.Substring (1).ToUpper ();
case '-':
if (arg.Length < 2)
return null;
int n = ((arg [1] == '-') ? 2 : 1);
return arg.Substring (n).ToUpper ();
default:
return arg;
}
}