Sequential Concatenation

To process sequentially concatenated data sets, use a DCB that has DSORG=PS. Each DD statement can include the following types of data sets:

Sequential data sets, which can be on disk, tape, instream (SYSIN), TSO terminal, card reader, and subsystem
UNIX files
PDS members
PDSE members

You can use sequential concatenation (DSORG=PS in DCB) to sequentially read directories of PDSs and PDSEs. See Reading a PDS Directory Sequentially.

Restriction: You cannot use this technique to read a z/OS UNIX directory.