IIRC, another option is "PURGE", which ships on all MPE systems :)
(Of course, that means you have to rebuild the UDC catalog.)
We recently encountered a site where ... somehow ... an HFS filename had
gotten
into COMMAND.PUB.SYS. You can't *delete* UDC entries with HFS filenames,
nor can you add them. I had to edit the file with Debug to change the name
into
something deleteable.
(It was a problem, IIRC, because it caused BULDACCT to fail.)
Stan
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