Hi Laura,
Can you try to put the .jar extension into its name, so something like this:
java -jar /u02/automic/utility/bin/ucybdbld.jar -B -X/u02/automic/utility/db/general/11.2/UC_UPD.TXT
or if you are within the Utility Bin directory already then:
java -jar ucybdbld.jar -B -X/u02/automic/utility/db/general/11.2/UC_UPD.TXT
If you try the suggestion above, do you still get the same error message as before in regards to an "Invalid or corrupt jarfile"