Commands are always lowercase. Parameters are case insensitive. Parameters are case insensitive. For example, if you provide a filename as a parameter, it is case sensitive. Directory names are case insensitive.
Directory names are case sensitive.
File names are case insensitive. File names are case sensitive. Database names, logical names, and sequence entries are case insensitive. The syntax for device names vary from that of directory or file names. The syntax for device names is the same as for directory and filenames.