There's also something with TSO "liking" jobnames of the userid plus one
letter, right?
Charles
-----Original Message-----
From: IBM Mainframe Discussion List [mailto:[email protected]] On
Behalf Of John Eells
Sent: Thursday, September 15, 2016 4:02 AM
To: [email protected]
Subject: Re: TSO User ID Rules (Was: z/OS and code pages)
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.
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