IBM OS/390 Controlling Time Sharing Users, Controlling Batch Jobs, Controlling Started Tasks

28.5.2 Controlling Time Sharing Users

TSO/E users logon through terminals controlled by VTAM. You can use MVS or JES2 commands to control TSO users and their output:

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Send a Message to a TSO User with the MVS

²SEND ¢message_text¢,U = u s e r i d ² command. Be careful not to omit the

²,U = ( )² operand, or your message will be sent to all TSO users and they will get aggravated with this if it happens repeatedly.

Cancel the TSO session with the MVS ²CANCEL U=userid² command, or the JES2 $C command.

There may also be times when you cannot cancel a TSO user with the $C command, so you will have to force the address space down with the

²FORCE² command. This may be necessary for a TSO user to get out of a ²hung² condition, and log back on again.

Release, Cancel, or Modify TSO held output with the JES2 $O or $TO command.

The SDSF DA, ST, O and H panels can also be used to control TSO users or their queued output. (Any JES2 command can be issued through these panels.)

28.5.3 Controlling Batch Jobs

Batch jobs are submitted by TSO users, or by other programs such as batch job scheduling systems like OPC/A. They are queued on the ²Job Queue² by JES2 and selected by batch initiators according to your installation¢s job scheduling criteria. (WLM or JES can manage the initiators.)

Jobs can also be started by the operator from the console with the MVS START command, but then they behave very much like ²started tasks². (See the next topic below.)

Jobs can be canceled by the operator with either an MVS Cancel command, or the JES2 $C command.

The SDSF DA, ST, O and H panels can also be used to control batch jobs or their queued output.

28.5.4 Controlling Started Tasks

Started Tasks (or ²STCs²) are like batch jobs, but started by the MVS ²START² command (abbreviated ²S²) from an operator console instead of submitted by a TSO user or another job. You can override many parameters on the START command, including the name that shows up on a display.

Other commands used to control started tasks are described in OS/390 MVS

System Commands, GC28-1781.

∙Display status about the started task with the MVS ²DISPLAY² command or JES2 $D command.

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Modify the started task with the MVS ²MODIFY² command.

Stop the started task with the MVS ²STOP² command.

Cancel the started task with the MVS ²CANCEL² or JES2 $C command.

If they fail to stop or cannot be canceled, they can be ²Forced² with the MVS ²FORCE² command.

Chapter 28. Orientation to OS/390 Console Operation 451