The Work with Message Descriptions (WRKMSGD) or Display Message Description (DSPMSGD) command views or prints single messages or a range of message descriptions in a message file.
Here is an example of using the Display Message Description (DSPMSGD) command:
DSPMSGD RANGE(*FIRST IDU0571) MSGF(QIDU/QIDUMSG)
FMTTXT(*NO) OUTPUT(*PRINT)
To see the exception messages which can be generated with a command, see the description of the command.