Joined: 23 Nov 2006 Posts: 19270 Location: Inside the Matrix
If you want to re-use the file by overwriting it in an application program, you can specify DISP=OLD in the JCL. An OPEN OUTPUT will create "new" output in the existing file.
One caution is that you may run out of the "old" space and abend when the "new" data is larger than the "old" data.
Do you want to reuse the file due to a catalog problem? If so, you can add an IEFBR14 step before the "catalog" step that will unconditonally delete the file. Here's an example of what i just described: