Interesting enough to make me go search.
For a change I jumped to RTFMing with PF1 and it shows:

Purpose:         Limit the jobs that are displayed by job name.       
   (In some cases, this involves columns other than JOBNAME.  
   See the note at the end of this topic.)                    
 ...
With the PREFIX command, two additional columns may be used.     
For jobs that entered the system through the TSO/E Interactive   
Data Transmission Facility (netmail), SDSF compares the value    
for the PREFIX command with a value that is displayed in the     
Wtr column (output external writer name) or as part of the       
Dest column (JES print destination name).                        

Does this help?

Kees.


-----Original Message-----
From: IBM Mainframe Discussion List [mailto:[email protected]] On
Behalf Of EXT-Schwarz, Barry
Sent: Monday, April 15, 2013 15:41
To: [email protected]
Subject: Strange response to SDSF PREFIX command

We have a sequence of JES2 commands that run at 1600 every day to purge
output more the 7 days old.  For reasons almost lost in antiquity, the
sequence avoided purging jobs/tasks that begin with S.  When I first
noticed several hundred jobs in the output queue (SDSF command O), I
started looking for a pattern.  I issued the PREFIX A* and saw a few but
they were recent.  I then issued PREFIX B* and dozens of jobs name SU00Y
appeared.  (If it matters, the prefix commands were entered in lower
case.  I capitalized them here for ease of reading.)  I have never seen
a response that didn't match the prefix before.  This is on z/OS 1.11.
Thoughts anyone?

PS - After finally recalling the reason for this, the fix to the command
sequence is to add $PJQ(S*),JM!=SYSLOG,A>7 but I'm still curious why
SDSF thought SU00Y matched prefix B*.

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