By Michael D Duffy
ISBN-10: 1555582796
ISBN-13: 9781555582791
OpenVMS execs have lengthy loved a strong, full-featured working process working the main mission-critical functions in lifestyles. even though, lots of ultra-modern graduates won't but have had the chance to event it for themselves. meant for an viewers with a few wisdom of working platforms comparable to home windows, UNIX and Linux, Getting begun with OpenVMS introduces the reader to the OpenVMS approach.Part 1 is a pragmatic advent to get the reader began utilizing the approach. The reader will examine the OpenVMS terminology and method of universal ideas similar to approaches and threads, queues, person profiles, command line and GUI interfaces and networking. half 2 offers extra in-depth information regarding the key elements for the reader needing a extra technical description. issues comprise method constitution, scheduling, reminiscence administration and the dossier method. brief sections at the heritage of OpenVMS, together with prior, current, and destiny help (like the Intel Itanium migration), are integrated. OpenVMS is taken into account in several roles, resembling a machine approach, a multi-user method, a community server, and in a mixture of roles. permits the extra complex reader a few meaty content material but doesn't weigh down the noviceProvides useful examples exhibiting that OpenVMS is well-suited for renowned sleek applicationsGives a high-level evaluation of suggestions at the back of internals similar to reminiscence administration
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Additional resources for Getting Started with OpenVMS: A Guide for New Users (HP Technologies)
Example text
Entering Commands Once you have successfully logged in to your OpenVMS system, you may begin entering commands. The DCL Command Line Interpreter (CLI) is the program that accepts the commands you type; it ensures that they are valid commands and carries them out. OpenVMS provides a type-ahead buffer. This allows you to continue entering commands while a previous command is still processing. While a previous command is executing, your keystrokes will not be shown, but will be carried out when the current command completes.
It usually performs some service for the parent process—for example, using CLI commands from within a compiled program or executing a command that may take a long time. Using a subprocess to execute a timeconsuming command allows you to continue entering and processing commands while the subprocess works on the time-consuming one. Chapter 3 – Multiuser Concepts 19 Normally, a subprocess finishes its work and terminates before its parent process does. A subprocess that still exists when the parent process ends is automatically destroyed, whether its work is finished or not.
This category includes every other user not mentioned above. Each of these four categories may be granted or denied the ability to read (examine), write (modify), execute (if the file is a program or procedure), or delete the file. The ability to change the protection of the file (CONTROL access) is granted automatically to the OWNER and SYSTEM categories. As a practical matter, this means you cannot accidentally deny yourself access to your files (as you can always grant yourself access again), nor can you prevent SYSTEM users from gaining access.
Getting Started with OpenVMS: A Guide for New Users (HP Technologies) by Michael D Duffy
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