Discover the purpose and usage of the $du command in JES2, a powerful job entry subsystem for IBM mainframes. Learn how $du helps manage and monitor jobs efficiently.
Table of Contents
Question
$du is a
A. MVS command
B. Jes2 command
C. IMS command
D. TSO command
Answer
B. Jes2 command
Explanation
JES2 (Job Entry Subsystem 2) is a powerful job entry subsystem for IBM mainframes that manages job scheduling, execution, and output processing. The $du command is one of the many JES2 commands available to system operators and administrators.
The $du command displays detailed information about a specific job or a range of jobs in the JES2 job queue. When executed, it provides comprehensive details such as:
- Job name, number, and owner
- Job class and priority
- Job status (e.g., held, active, or awaiting execution)
- Job’s estimated start time and execution duration
- Input/output device assignments
- Resource consumption (e.g., CPU time, memory usage)
This command is essential for monitoring and managing jobs in the JES2 environment. By using $du, mainframe professionals can quickly identify job-related issues, optimize resource allocation, and ensure smooth operation of the system.
In summary, $du is a powerful JES2 command that displays detailed information about jobs in the JES2 job queue, enabling efficient job management and monitoring on IBM mainframes.
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