Oracle documentation says that non-standard vm options like the startup heap size and the maximum heap size, are set by prefixing them with -X. So to set the startup heap size to 128 MB, you would use -Xms128m.
However, -ms and -mx also seem to work. Is this true or does using -ms instead -Xms have some other effect?
Is this documented anywhere, either that -X is not necessary or that they are standard options?
Are there other options like these, which do not need to be prefixed with -X?