APPEND
The APPEND option specifies whether an existing data set is to
be extended or re-created.

.-Y-.
>>-APPEND--(-+-N-+-)-------------------------------------------><
- Y
- Specifies that new records are to be added to the end of a
sequential data set, or inserted in a relative or indexed data set.
This is the default.
- N
- Specifies that, if the file exists, it is to be re-created.
The APPEND option applies only to OUTPUT files. APPEND is ignored
if:
- The file does not exist
- The file does not have the OUTPUT attribute
- The organization is REGIONAL(1)