JES2 commands

JES2 processes its initialization statements and commands in a way that allows most initialization statements to be changed by operator command. The following is a partial list of the control that JES2 commands have over JES2 processing. Operator commands can be used to:

Add function and functional subsystems
Modify previously defined processing, such as: output definition, the dynamic alteration of the checkpoint definition, enabling installation-defined exits, offload devices, printer and punch characteristics, and job characteristics
Delete function, and network systems, exits, and diagnostic traces
Start, stop, and halt devices under JES2 control
Assign units to local printers, punches, card readers, and lines or reassign units to these devices
Display current facility and device definition.

All JES2 commands are entered using standard MVS™ command interfaces (such as through an MVS console or within the JES2 initialization data set). The command prefix character, which defaults to a dollar sign character ($), distinguishes JES2 commands and messages from other components of the operating system. For commands, the prefix character defines the scope of the command as being JES2 only; for messages, the prefix character is informational in that it designates that the message was issued by the JES2 component.