Summary of changes for z/OS Version 2 Release 1 (V2R1) as updated February, 2015

New

The dbx debugger now supports machine-level debugging of vector-enabled programs. A new variable, $novregs, was added to the set subcommand of dbx. See set subcommand for dbx: Define a value for a dbx variable. It was also added to variables: "Set" variables. Information about vector registers was added to Usage notes for the registers subcommand of dbx.
The usage note for the registers subcommand of dbx was also updated with information about displaying and assigning vector registers. See Usage notes for the registers subcommand of dbx.
With APAR OA46568, a usage note was added to the ls command about issuing the ls command against a large directory structure. See Usage notes for the ls command.
With APAR OA46394, to comply with UNIX specifications, a certain arithmetic substitution was changed. See Arithmetic substitution.

For the cd command, too many arguments could also result in exit value 2. See cd — Change the working directory.