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| Using Logical Names |
| Concepts |
| Logical names provide a way to name objects abstractly, that is, you define a logical synonym for some object and then use the synonym when referencing the object. One of the benefits derived from this level of abstraction is the idea of device independence. This means that, for instance, you can define a logical name for a device, such as STUDENT. Your command procedures can reference the device as STUDENT. Should the actual physical device have to be replaced, the only change necessary to make your references valid is for the logical name STUDENT to be redefined to the new device (also assuming the data was restored to that device).
The OpenVMS operating system makes extensive use of logical names. Some of the predefined logical names can be useful for the general user. Users can also define their own logical names. Logical names are stored in tables, either the specific predefined tables or user-created tables.
This module discusses defining and using logical names. |
| Objectives |
- Explain the basic utility of logical names
- Search logical name tables
- Create appropriate level logical names
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| Topics |
- Functions of logical names
- Displaying logical names
- Creating and deleting logical names
- Changing or overruling logical names
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| Disclaimer: HP-UX, Tru64 Unix, OpenVMS and are registered trademarks of the Hewlett Packard Corporation. Solaris and Java are registered trademarks of Sun Corporation. AIX is a registered trademark of IBM. Oracle is a registered trademark of Oracle Corporation. |
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