100 lines
2.6 KiB
HTML
100 lines
2.6 KiB
HTML
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
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<html>
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<head>
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<meta name="generator" content="HTML Tidy, see www.w3.org">
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<meta http-equiv="Content-Type" content=
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"text/html; charset=utf-8">
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<title>readonly - Set read-only attribute for variables</title>
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<LINK rel="stylesheet" type="text/css" href="../rzahg/ic.css">
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</HEAD>
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<body bgcolor="#FFFFFF">
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<!-- Java sync-link -->
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<SCRIPT LANGUAGE="Javascript" SRC="../rzahg/synch.js" TYPE="text/javascript"></SCRIPT>
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<h2>readonly - Set read-only attribute for variables</h2>
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<strong>Synopsis</strong>
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<p><strong>readonly</strong> [ <strong>-p</strong> ] [ <em>
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name</em> [ <em>=value</em> ] ... ]</p>
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<p><strong>Description</strong></p>
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<p>You can use <strong>readonly</strong> to set the read-only
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attribute for the variables specified by <em>name</em>. A
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variable with the read-only attribute cannot have its value changed
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by a subsequent assignment and cannot be unset.</p>
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<p>Note that <strong>qsh</strong> can change the value of a
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variable with the read-only attribute. For example, if <strong>
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PWD</strong> has the read-only attribute, it's value will be
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changed when you change the current working directory.</p>
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<p>When no arguments are specified, <strong>qsh</strong> displays a
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list of the variables with the read-only attribute and their
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values.</p>
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<p><strong>Options</strong></p>
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<dl>
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<dt><strong>-p</strong></dt>
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<dd>Precede each line of the output with the word "readonly " so it
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is displayed in a re-enterable format.</dd>
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</dl>
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<p><strong>Operands</strong></p>
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<p>Each <em>name</em> specifies a variable in the current
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environment. If a <em>value</em> is also specified, the value of
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the variable is updated before setting the read-only attribute.</p>
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<p><strong>Exit Status</strong></p>
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<ul>
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<li>0 when successful.</li>
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<li>>0 when unsuccessful.</li>
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</ul>
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<p><strong>Related information</strong></p>
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<ul>
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<li><a href="declare.htm">declare - Declare variables and set attributes</a></li>
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<li><a href="export.htm">export - Set export attribute for variables</a></li>
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<li><a href="local.htm">local - Assign a local variable in a function</a></li>
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<li><a href="set.htm">set - Set or unset options and positional parameters</a></li>
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<li><a href="unset.htm">unset - Unset values of variables and functions</a></li>
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</ul>
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<strong>Examples</strong>
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<ol>
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<li>Set the read-only attribute for an existing variable:
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<pre>
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readonly ALPHA
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</pre>
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</li>
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<li>Set the value and read-only attribute of a new variable:
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<pre>
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readonly ALPHA=one
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</pre>
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</li>
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<li>List all variables with the read-only attribute:
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<pre>
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readonly
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</pre>
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</li>
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</ol>
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</body>
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</html>
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