In this section, we will cover essential system management commands in OpenVMS. These commands are crucial for maintaining and administering an OpenVMS system effectively. We will explore commands related to system status, resource management, and system configuration.

1. System Status Commands: Commands to check the current status of the system, including uptime, resource usage, and system performance.
2. Resource Management Commands: Commands to manage system resources such as memory, CPU, and disk space.
3. System Configuration Commands: Commands to configure system parameters and settings.

The SHOW SYSTEM command provides a snapshot of the current system status, including active processes, CPU usage, and memory usage.

Explanation:

• This command displays a list of all active processes, their states, CPU time, and other relevant information.

The SHOW MEMORY command displays the current memory usage of the system.

Explanation:

• This command provides details about physical memory, virtual memory, and paging file usage.

The SHOW CPU command shows the status of the CPUs in the system.

Explanation:

• This command displays information about each CPU, including its state (e.g., active, idle), and usage statistics.

The SET PROCESS command is used to modify the attributes of a process, such as its priority or quotas.

Explanation:

• This command sets the priority of the current process to 5.

The SET MEMORY command is used to configure memory-related parameters.

Explanation:

• This command sets the memory expansion limit to 100 pages.

The SET CPU command is used to configure CPU-related parameters.

Explanation:

• This command sets the state of the CPU to active.

The SET TIME command is used to set the system date and time.

Explanation:

• This command sets the system date and time to September 15, 2023, at 10:00 AM.

The SET DEFAULT command changes the default directory for the current process.

Explanation:

• This command sets the default directory to SYS$SYSROOT:[SYSMGR].

The SET LOGICAL command defines a logical name.

Explanation:

• This command defines the logical name MYDISK to refer to the device DKA0:.

1. Use the SHOW SYSTEM command to display the current system status.
2. Use the SHOW MEMORY command to check the memory usage.
3. Use the SHOW CPU command to view the status of the CPUs.

Solution:

1. Change the priority of your current process to 7 using the SET PROCESS command.
2. Set the memory expansion limit to 200 pages using the SET MEMORY command.
3. Set the state of the CPU to idle using the SET CPU command.

Solution:

1. Set the system date and time to October 1, 2023, at 12:00 PM using the SET TIME command.
2. Change the default directory to SYS$SYSROOT:[USER] using the SET DEFAULT command.
3. Define a logical name MYDIR to refer to the directory SYS$SYSROOT:[USER] using the SET LOGICAL command.

Solution:

• Mistake: Forgetting to use the correct syntax for date and time in the SET TIME command.

  • Tip: Always use the format DD-MMM-YYYY:HH:MM:SS for setting the date and time.

• Mistake: Not specifying the correct directory path in the SET DEFAULT command.

  • Tip: Ensure the directory path exists and is correctly typed.

• Mistake: Overlooking the need to have appropriate privileges for certain commands.

  • Tip: Some commands require elevated privileges. Ensure you have the necessary permissions.

In this section, we covered essential system management commands in OpenVMS. These commands are vital for monitoring system status, managing resources, and configuring system parameters. By mastering these commands, you will be better equipped to maintain and administer an OpenVMS system effectively. In the next section, we will delve into using help and documentation in OpenVMS.