Immediate Commands

Purpose

You can issue an Immediate command from the terminal only after causing an attention interruption by pressing the Attention key (or its equivalent, such as the Enter key). These commands are processed as soon as they are entered. The HT and RT Immediate commands are also recognized when they are stacked in an exec procedure, and the HT Immediate command can be appended to a CMS command preceded by a logical line end symbol (#). Any program execution in progress is suspended until the Immediate command is processed.

None of the Immediate commands issue responses.

The Immediate commands are:
HB
Halt batch execution
HI
Halt interpretation
HO
Halt tracing
HT
Halt typing
HX
Halt execution
RO
Resume tracing
RT
Resume typing
SO
Suspend tracing
TE
Trace end
TS
Trace start
You can define your own Immediate commands by using any of these, the:
  • IMMCMD macro in an assembler language program

    For more information, see z/VM: CMS Macros and Functions Reference.

  • IMMCMD command within an exec (CMS EXEC, EXEC 2, REXX)

    For more information, see IMMCMD.

  • NUCXLOAD command with the IMMCMD option specified.

    For more information, see NUCXLOAD.

For more information on the Immediate commands, see z/VM: CMS User's Guide.