Keywords in RCL commands are not case-sensitive. You can enter them with any combination of uppercase or lowercase letters.
Identifiers and character data may or may not be case-sensitive, depending on the sort order that is in effect.
If you are using a case-sensitive sort order such as “binary,” you must enter identifiers and character data using the correct combination of uppercase and lowercase letters.
If you are using a sort order that is not case-sensitive, such as “nocase,” you can enter identifiers and character data using any combination of uppercase or lowercase letters.