76 lines
5.0 KiB
HTML
76 lines
5.0 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 name="DC.Type" content="concept" />
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<meta name="DC.Title" content="Symbolic link" />
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<meta name="abstract" content="A symbolic link, which is also called a soft link, is a path name contained in a file." />
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<meta name="description" content="A symbolic link, which is also called a soft link, is a path name contained in a file." />
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<meta name="DC.subject" content="link, symbolic, symbolic link, what is it?, symbolic link, example of using, example, using symbolic link" />
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<meta name="keywords" content="link, symbolic, symbolic link, what is it?, symbolic link, example of using, example, using symbolic link" />
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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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<link rel="stylesheet" type="text/css" href="./ic.css" />
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<title>Symbolic link</title>
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</head>
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<body id="rzaaxsymlnk"><a name="rzaaxsymlnk"><!-- --></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">Symbolic link</h1>
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<div><p>A <dfn class="term">symbolic link</dfn>,
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which is also called a soft link, is a path name contained in a file. </p>
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<p>When the system encounters a symbolic link, it follows the path name provided
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by the symbolic link and then continues on any remaining path that follows
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the symbolic link. If the path name begins with a /, the system returns to
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the / (<span class="q">"root"</span>) directory and begins following the path from that point.
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If the path name does not begin with a /, the system returns to the immediately
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preceding directory and follows the path name in the symbolic link beginning
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at that directory.</p>
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<p>Consider the following example of how a symbolic link might be used:</p>
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<div class="fignone"><span class="figcap">Figure 1. An example of using a symbolic link</span><br /><img src="rv3n068.gif" alt="An example of using a symbolic link" /><br /></div>
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<p>You select a menu option to show the status of customer accounts. The program
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displaying the menu uses the following path name: </p>
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<pre> /Customer/Status/Summary</pre>
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<p>The system follows the <em>Customer</em> link, which leads to a directory <span>1</span>,
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and then follows the <em>Status</em> link. The <em>Status</em> link is a symbolic
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link, which contains a path name <span>2</span>. Because the path name begins
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with a /, the system returns to the / (<span class="q">"root"</span>) directory and follows
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the links <em>Records</em> and <em>Accounts</em> in sequence. This path leads
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to another directory <span>3</span>. Now the system completes the path in the
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path name provided by the program. It follows the <em>Summary</em> link, which
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leads to a file <span>4</span> containing the data you will need.</p>
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<p>Unlike a hard link, a symbolic link is an object (of object type *SYMLNK);
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it can exist without pointing to an object that exists. You can use a symbolic
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link, for example, to provide a path to a file that will be added or replaced
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later.</p>
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<p>Also unlike a hard link, a symbolic link can cross file systems. For example,
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if you are working in one file system, you can use a symbolic link to access
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a file in another file system. Although the QSYS.LIB, independent ASP QSYS.LIB,
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and QDLS file systems do not support creating and storing symbolic links,
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you can create a symbolic link in the "root" (/) or QOpenSys file system that
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allows you to: </p>
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<ul><li>Access a database file member in the QSYS.LIB or independent ASP QSYS.LIB
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file systems.</li>
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<li>Access a document in the QDLS file system.</li>
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</ul>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rzaaxlinkifs.htm" title="A link is a named connection between a directory and an object. A user or a program can tell the server where to find an object by specifying the name of a link to the object. A link can be used as a path name or as part of a path name.">Link</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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