Delete noncataloged files

The DIRCONV statement REMOVE-UNCATALOGED-FILES (see "REMOVE-UNCATALOGED-FILES Delete noncataloged files") can be used to remove those files from a directory file which are no longer cataloged.
This prevents, for example, name conflicts if multiple directory files are merged. A message is issued for every file that was removed.

If any of the catalog IDs cannot be accessed, all files will be preserved in the directory file. Processing is then continued with the next catalog ID listed in the directory file.