87 lines
4.8 KiB
HTML
87 lines
4.8 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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<meta name="DC.Type" content="concept" />
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<meta name="DC.Title" content="Case sensitivity" />
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<meta name="abstract" content="If your application is sensitive to mixed case, move it into the /QOpenSys file system, or into a user-defined file system that has been created as case-sensitive." />
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<meta name="description" content="If your application is sensitive to mixed case, move it into the /QOpenSys file system, or into a user-defined file system that has been created as case-sensitive." />
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<meta name="DC.Relation" scheme="URI" content="rzalfcopying.htm" />
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<meta name="DC.Relation" scheme="URI" content="../ifs/rzaaxfscmp.htm" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 2000, 2006" />
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<meta name="DC.Identifier" content="rzalfcasesense" />
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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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>Case sensitivity</title>
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</head>
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<body id="rzalfcasesense"><a name="rzalfcasesense"><!-- --></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">Case sensitivity</h1>
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<div><p>If your application is sensitive to mixed case, move it into the
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/QOpenSys file system, or into a user-defined file system that has been created
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as case-sensitive.</p>
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<p>The interfaces of operating systems, such as AIX<sup>®</sup> and Linux<sup>®</sup>, generally
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differentiate between uppercase and lowercase letters. On <span class="keyword">i5/OS™</span>,
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that is not always the case. You should be aware of several situations in
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particular where case sensitivity might cause complications with existing
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code. </p>
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<p>Case sensitivity on a directory or file basis depends on the file system
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you are using on <span class="keyword">i5/OS</span>.
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The /QOpenSys file system is case sensitive, and you can create a user-defined
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file system (UDFS) that is case sensitive.</p>
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<div class="section"><h4 class="sectiontitle">Examples</h4><p>The following examples
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are problems stemming from case sensitivity that you might encounter.</p>
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</div>
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<div class="example"><h4 class="sectiontitle">Example 1</h4><p>In this example, the
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shell does a character comparison of the generic name prefix against what
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is returned by readdir(). However, the QSYS.LIB file system returns directory
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entries in uppercase, so none of the entries matches the lowercase generic
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name prefix.</p>
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<pre>$ ls -d /qsys.lib/v4r5m0.lib/qwobj*
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/qsys.lib/v4r5m0.lib/qwobj* not found
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$ ls -d /qsys.lib/v4r5m0.lib/QWOBJ*
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/qsys.lib/v4r5m0.lib/QWOBJ.FILE</pre>
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</div>
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<div class="example"><h4 class="sectiontitle">Example 2</h4><p> This example is similar to the first
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example except that, in this case, the <tt>find</tt> utility is doing the
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comparison, and not the shell.</p>
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<pre>$ find /qsys.lib/v4r5m0.lib/ -name 'qwobj*' -print
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$ find /qsys.lib/v4r5m0.lib/ -name 'QWOBJ*' -print
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/qsys.lib/v4r5m0.lib/QWOBJ.FILE</pre>
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</div>
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<div class="example"><h4 class="sectiontitle">Example 3</h4><p> The <tt>ps</tt> utility expects user
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names to be case-sensitive and therefore does not recognize a match between
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the uppercase name specified for the -u option and lowercase names returned
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by the <span class="keyword">i5/OS</span> PASE runtime
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function getpwuid():</p>
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<pre>$ ps -uTIMMS -f
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UID PID PPID C STIME TTY TIME CMD
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$ ps -utimms -f
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UID PID PPID C STIME TTY TIME CMD
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timms 617 570 0 10:54:00 - 0:00 /QOpenSys/usr/bin/-sh -i
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timms 660 617 0 11:14:56 - 0:00 ps -utimms -f</pre>
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</div>
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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="rzalfcopying.htm" title="Copy AIX binaries that you want to run in i5/OS PASE into the integrated file system.">Copy the i5/OS PASE program to your iSeries server</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="../ifs/rzaaxfscmp.htm">File system comparison</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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