89 lines
6.5 KiB
HTML
89 lines
6.5 KiB
HTML
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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE html
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PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html lang="en-us" xml:lang="en-us">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 2005" />
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<meta name="DC.rights.owner" content="(C) Copyright IBM Corporation 2005" />
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<meta name="security" content="public" />
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<meta name="Robots" content="index,follow" />
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<meta http-equiv="PICS-Label" content='(PICS-1.1 "http://www.icra.org/ratingsv02.html" l gen true r (cz 1 lz 1 nz 1 oz 1 vz 1) "http://www.rsac.org/ratingsv01.html" l gen true r (n 0 s 0 v 0 l 0) "http://www.classify.org/safesurf/" l gen true r (SS~~000 1))' />
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<meta name="DC.Type" content="concept" />
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<meta name="DC.Title" content="Overrides: An overview" />
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<meta name="abstract" content="An override is a CL command that temporarily changes a file name, a device name, or remote location name associated with the file, or some of the other attributes of a file." />
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<meta name="description" content="An override is a CL command that temporarily changes a file name, a device name, or remote location name associated with the file, or some of the other attributes of a file." />
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<meta name="DC.subject" content="overriding file, description, override, overriding file, commands used, file, commands used for, command, CL, overrides, used for, message files, difference from changing, attribute, changing, overrides versus changing, changing versus overrides" />
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<meta name="keywords" content="overriding file, description, override, overriding file, commands used, file, commands used for, command, CL, overrides, used for, message files, difference from changing, attribute, changing, overrides versus changing, changing versus overrides" />
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<meta name="DC.Relation" scheme="URI" content="rbal3override.htm" />
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<meta name="DC.Relation" scheme="URI" content="rbal3ovrben.htm" />
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<meta name="DC.Relation" scheme="URI" content="rbal3ovrcmds.htm" />
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<meta name="DC.Relation" scheme="URI" content="rbal3eoscd.htm" />
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<meta name="DC.Relation" scheme="URI" content="rbal3mtcrest.htm" />
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<meta name="DC.Relation" scheme="URI" content="../rbam6/rbam6clmain.htm" />
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<meta name="DC.Format" content="XHTML" />
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<meta name="DC.Identifier" content="rbal3ovrint" />
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<meta name="DC.Language" content="en-us" />
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<!-- US Government Users Restricted Rights -->
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<!-- Use, duplication or disclosure restricted by -->
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<!-- GSA ADP Schedule Contract with IBM Corp. -->
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<link rel="stylesheet" type="text/css" href="./ibmdita.css" />
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<link rel="stylesheet" type="text/css" href="./ic.css" />
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<title>Overrides: An overview</title>
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</head>
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<body id="rbal3ovrint"><a name="rbal3ovrint"><!-- --></a>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">Overrides: An overview</h1>
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<div><p>An <dfn class="term">override</dfn> is a CL command that temporarily changes
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a file name, a device name, or remote location name associated with the file,
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or some of the other attributes of a file.</p>
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<p>You can enter override commands interactively from a display station or
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submit them as part of a batch job. You can include them in a control language
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(CL) program, or issue them from other programs by calling the program QCMDEXC.
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Regardless of how they are issued, overrides remain in effect only for the
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job, program, or display station session in which they are issued. Furthermore,
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they have no effect on other jobs that might be running at the same time.</p>
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<p>When you create an application program, the file names specified in the
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program associate files with it. The server lets you override these file names
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or the attributes of the specified file when you compile a program or run
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a program.</p>
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<p>You can use overrides to change most, but not all, of the file attributes
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that are specified when the file is created. In some cases, you can specify
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attributes in overrides that are not part of the original file definition.</p>
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<p>Overriding a file is different from changing a file in that an override
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does not permanently change the attributes of a file. For example, if you
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override the number of copies for a printer file by requesting six copies
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instead of two, the file description for the printer file still specifies
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two copies, but six copies are printed. The server uses the file override
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command to determine which file to open and what its file attributes are.</p>
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<div class="p">The server supplies three override functions: <ul><li><a href="rbal3applyovr.htm#rbal3applyovr">Apply overrides</a></li>
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<li><a href="rbal3deover.htm#rbal3deover">Delete overrides</a></li>
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<li><a href="rbal3diover.htm#rbal3diover">Display overrides</a></li>
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</ul>
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</div>
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<p>Handling overrides for message files is different in some respects from
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handling overrides for other files. You can override only the name of the
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message file, and not the attributes.</p>
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</div>
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<div>
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<ul class="ullinks">
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<li class="ulchildlink"><strong><a href="rbal3ovrben.htm">Benefits of using overrides</a></strong><br />
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Overrides are particularly useful for making minor changes to the way a program functions or for selecting the data on which it operates without having to recompile the program. Their principal value is in allowing you to use general purpose programs in a wider variety of circumstances.</li>
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<li class="ulchildlink"><strong><a href="rbal3ovrcmds.htm">Summary of the override commands</a></strong><br />
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You can process override functions for files by using the CL commands including DLTOVR, DSPOVR, OVRDBF, and so on.</li>
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<li class="ulchildlink"><strong><a href="rbal3eoscd.htm">Effect of overrides on some commands</a></strong><br />
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Some commands ignore overrides entirely, while others allow overrides only for certain parameters.</li>
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<li class="ulchildlink"><strong><a href="rbal3mtcrest.htm">Use overrides in multithreaded jobs</a></strong><br />
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You can use the OVRDBF, OVRPRTF, OVRMSGF, and DLTOVR commands in a multithreaded job with some restrictions.</li>
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</ul>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rbal3override.htm" title="You can use overrides to temporarily change a file name, a device name associated with the file, or some of the other attributes of a file.">Use overrides</a></div>
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</div>
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<div class="relinfo"><strong>Related information</strong><br />
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<div><a href="../rbam6/rbam6clmain.htm">Control language (CL)</a></div>
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</div>
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</div>
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</body>
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</html>
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