On 02/19/2012 11:40 AM, Shmuel Metz (Seymour J.) wrote:
In
<cajtoo59ducxpmrtvozjwjxbr26rbq1hdbdarsnfundxbhfw...@mail.gmail.com>,
on 02/18/2012
at 07:06 PM, Mike Schwab<[email protected]> said:
Neither Windows or Linux have a Catalog concept to find a dataset on
What do you think a directory is?
Under Windows, a directory is closer functionally to the MVS/DOS concept
of a VTOC, as each volume has its own directory and you have to somehow
know which volume to consult -- although admittedly in a windows system
the number of volumes is typically very low. In Linux, if all volumes
are mounted, the directory plays a similar functional role to that of
the MVS catalog(s) and VTOCs combined. But in either case they are
obviously structurally different: finding an file entry in Windows or
Linux requires a progressive search through multiple directory levels
rather than just a single lookup of the full path name as with a data
set name in an MVS catalog. And in both Windows and Linux, in many
cases the user thinks of a file by its file name and not its full path,
and the onus in on the user to remember under what directory the file
was placed. That issue does not arise in MVS because dataset names are
always referenced by the full name -- roughly the equivalent to always
requiring the full path name in Win/Linux -- and that makes direct
lookup in a "catalog" possible.
--
Joel C. Ewing, Bentonville, AR [email protected]
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