Adding a data set to an existing DDNAME in TSO.

I wanted to add a data set to the already allocated ISPTLIB concatenation. You can use the TSO ALLOCate command to allocate a list of data sets, but not to add a data set to an existing definition.

Lionel B. Dyck pointed me to the TSO function bpxwdyn.

When I logon to TSO I invoke a userid.ZLOGON.REXX data set

/* Rexx */                                                              
                                      
  address TSO                                                           
  userid = userid()                                                     
  dsn= userid".S0W1.ISPF.ISPPROF"                                                                  
  req = "ALLOC FI(tmp) DA('"dsn"') SHR "              
  if bpxwdyn(req )  =0 then                                             
         call bpxwdyn "concat ddlist(ISPTLIB,tmp) "                     
 "ispf"                                                                

• The bpxwdyn(req ) allocates the dataset to the DDNAME TMP.
• The call bpxwdyn “concat ddlist(ISPTLIB,tmp) copies the data set(s) in the tmp DDNAME to the end of the ISPTLIB DDNAME
• ispf starts ISPF.

The TSO ISRDDN command gave me

                          Current Data Set Allocations           Row 68 of 122
Command ===>                                                  Scroll ===> CSR
                                                                              
 Volume   Disposition Act DDname   Data Set Name   Actions: B E V M F C I Q   
 B3RES1   SHR,KEEP   >    ISPTLIB  ISP.SISPTENU                               
...                          
 A4USR1   SHR,KEEP   >             COLIN.S0W1.ISPF.ISPPROF                           

Easy once you know how.

On the CBTAPE are KONCAT and CONCAT which do a similar function.