> Could prebuild the file and use >> to append to it.


Whether you use > or >> you need to include a '*' for a file equation or
else the CI redirection will only look for TEMP files, and create one if
there is no file (whether or not there is a permanent file of that name).

The difference between > or >> is that a single > will open the file with
ACC=OUT and delete the previous contents.  >> opens with ACC=APPEND

You can use a file equation as simple as FILE X;DISC=1000000
then >*X will build a larger file.

The important thing to remember is that you should include ,OLD to open a
permanent file for output.

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