CANCEL command

Use the CANCEL command to end an active job, started task, or time-sharing user immediately. The table that follows summarizes the tasks that the CANCEL command can perform. Following the table are usage notes, the complete command syntax, definition of parameters, and examples of use.

If the program that supports the job or started task was designed to recognize the STOP command, use the STOP command before using the CANCEL command. If the CANCEL command fails several times, consider using the FORCE command.

Table 1. CANCEL Command Tasks
Task - Immediately Terminate:	Syntax
A job in execution A running Advanced Program-to-Program Communication/MVS (APPC/MVS) transaction program A started task	CANCEL jobname
A address space identifier of the work unit you want to cancel	CANCEL ASID=asid
A time-sharing user	CANCEL U=userid
A started task A MOUNT command An external writer allocation The output processing for a job A z/OS UNIX process	CANCEL identifier

Note:

If your system was part of a global resource serialization ring (GRS=START, GRS=JOIN or GRS=TRYJOIN was specified at IPL) and the system is either inactive or quiesced (by entering the VARY GRS(system name),QUIESCE command), the CANCEL command might not work for jobs that own any global resources. Use DISPLAY GRS to determine GRS status.
If a job is running, you can end it using either the CANCEL system command or the appropriate subsystem command. However, if the job is not running, you must CANCEL the job using the subsystem command.
The CANCEL command issues an ABEND with either code 122 or 222 to abnormally end a job step or time-sharing user. The ABEND is asynchronous and might result in additional errors, depending on which programs were active at the time of the request. You might need to issue additional CANCEL commands to completely end the job.
Entering the CANCEL command during device allocation terminates the external writer as well as the unit of work. Entering this command when the external writer is processing output for a job terminates the output processing but leaves the external writer to process other data sets.
When you cancel a MOUNT command for a tape unit, the MOUNT command can end before the volume has been mounted. If the MOUNT command has ended and the mount request is not satisfied, issue the UNLOAD command to free the tape unit.