Timothy Sipples wrote:
<snip>
"TSO and MVS also require that the first character of user IDs be uppercase
A - Z, # (X'7B'), $ (X'5B'), or @ (X'7C')."
So what does "MVS" mean in this context? The Administrator's Guide doesn't
say. "Not z/OS UNIX System Services" is a reasonable answer, but it might
be a partial one.
The MVS restriction stems from the need to name PDS members starting
with an alphabetic or national character, as all users were originally
represented by one or more members of the User Attribute Data Set
(UADS). User IDs defined in RACF today can also be defined in UADS, so
the restriction remains.
The 7-character length restriction comes from the same source. Users in
UADS have one or more members in that data set, depending on its block
size and the number of attributes in their user entries. The last
character is numeric, so someone with a lot of attributes might have
UADS members USERID0-USERID9. This causes the last character to be
"reserved," and as PDS members may have 1-8 character names, TSO/E user
IDs can be 1-7 characters in length.
--
John Eells
IBM Poughkeepsie
[email protected]
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