94 lines
6.5 KiB
HTML
94 lines
6.5 KiB
HTML
<?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="security" content="public" />
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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="Directory" />
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<meta name="abstract" content="A directory is a special object that is used to locate objects by names that you specify. Each directory contains a list of objects that are attached to it. That list can include other directories." />
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<meta name="description" content="A directory is a special object that is used to locate objects by names that you specify. Each directory contains a list of objects that are attached to it. That list can include other directories." />
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<meta name="DC.subject" content="directory, what is it?" />
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<meta name="keywords" content="directory, what is it?" />
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<meta name="DC.Relation" scheme="URI" content="rzaaxbasics.htm" />
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<meta name="DC.Relation" scheme="URI" content="rzaaxcurdir.htm" />
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<meta name="DC.Relation" scheme="URI" content="rzaaxhomedir.htm" />
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<meta name="DC.Relation" scheme="URI" content="rzaaxtmpdir.htm" />
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<meta name="DC.Relation" scheme="URI" content="rzaaxtype2.htm" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 1999, 2006" />
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<meta name="DC.Rights.Owner" content="(C) Copyright IBM Corporation 1999, 2006" />
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<meta name="DC.Format" content="XHTML" />
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<meta name="DC.Identifier" content="rzaaxdir" />
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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>Directory</title>
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</head>
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<body id="rzaaxdir"><a name="rzaaxdir"><!-- --></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">Directory</h1>
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<div><p><span>A <dfn class="term">directory</dfn> is a special
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object that is used to locate objects by names that you specify. Each directory
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contains a list of objects that are attached to it. That list can include
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other directories.</span></p>
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<p>The integrated file system provides a hierarchical directory structure
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that allows you to access all objects in your server. You might think of
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this directory structure as an inverse tree where the root is at the top and
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the branches below. The branches represent directories in the directory hierarchy.
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These directory branches have subordinate branches that are called subdirectories.
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Attached to the various directory and subdirectory branches are objects such
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as files. Locating an object requires specifying a path through the directories
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to the subdirectory to which the object is attached. Objects that are attached
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to a particular directory are sometimes described as being <dfn class="term">in</dfn> that
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directory.</p>
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<p>A particular directory branch, along with all of its subordinate branches
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(subdirectories) and all of the objects that are attached to those branches,
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is referred to as a <dfn class="term">subtree</dfn>. Each file
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system is a major subtree in the integrated file system directory structure.
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In the QSYS.LIB and independent ASP QSYS.LIB file systems' subtrees, a library
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is handled the same way as a subdirectory. Objects in a library are handled
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like objects in a subdirectory. Because database files contain objects (database
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file members), they are handled like subdirectories rather than objects.
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In the document library services file system (QDLS subtree), folders are handled
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like subdirectories and documents in folders are handled like objects in a
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subdirectory.</p>
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<p>Because of differences in file systems, the operations you can perform
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in one subtree of the directory hierarchy may not work in another subtree.</p>
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<p>The integrated file system directory support is similar to the directory
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support that is provided by the DOS file system. In addition, it provides
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features typical of UNIX<sup>®</sup> systems, such as the ability to store a file only
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once but access it through multiple paths by using links.</p>
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<p>File systems and objects are branches on the integrated
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file system directory tree. See the following figure for an example of an
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integrated file system directory tree.</p>
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<div class="fignone"><span class="figcap">Figure 1. Sample integrated file system directory tree</span><br /><img src="rv3n061.gif" alt="File systems and objects are branches on the integrated file system directory tree" /><br /></div>
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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="rzaaxcurdir.htm">Current directory</a></strong><br />
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The current directory is similar to the idea of the current library.
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It is also called the <dfn class="term">current working directory</dfn>,
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or just <dfn class="term">working directory</dfn>.</li>
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<li class="ulchildlink"><strong><a href="rzaaxhomedir.htm">Home directory</a></strong><br />
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The <dfn class="term">home directory</dfn> is used
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as the current directory when you sign on the system. The name of the home
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directory is specified in your user profile.</li>
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<li class="ulchildlink"><strong><a href="rzaaxtmpdir.htm">Provided directories</a></strong><br />
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The integrated file system creates these directories when the system is restarted if they do not already exist.</li>
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<li class="ulchildlink"><strong><a href="rzaaxtype2.htm">*TYPE2 directories</a></strong><br />
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The "root" (/), QOpenSys, and user-defined file systems (UDFS) in the integrated file system support the *TYPE2 directory format. The *TYPE2 directory format is an enhancement of the original *TYPE1 directory format.</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="rzaaxbasics.htm" title="This topic introduces the basic concepts of integrated file system, such as directory, link, path name, stream file, name continuity, extended attributes, and scanning support.">Integrated file system concepts</a></div>
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</div>
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</div>
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</body>
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</html> |