61 lines
1.8 KiB
HTML
61 lines
1.8 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>Select command</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>Select command</h2>
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<p>The syntax of the <strong>select</strong> command is</p>
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<p><strong>select</strong> <em>name</em> <strong>[ in</strong> <em>
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word</em> ... <strong>]</strong></p>
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<p><strong>do</strong> <em>list</em></p>
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<p><strong>done</strong></p>
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<p>The <em>words</em> are expanded, generating a list of items.
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If <em>word</em> is not specified, the positional parameters are
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expanded. The set of expanded words is written to standard
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error, each preceded by a number. The PS3 prompt is then displayed
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and a line is read from standard input. If the line consists of a
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number corresponding to one of the displayed words, <strong>qsh</strong>
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sets the value of <em>name</em> to the word corresponding to
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the number. If the line is empty, <strong>qsh</strong> displays the
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list again. The REPLY variable is set to the contents of the input
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line.</p>
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<p><strong>qsh</strong> runs the commands in <em>list</em> until a
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<a href="break.htm">break</a>, <a href="return.htm">return</a>, or
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<a href="exit.htm">exit</a> command is run. <strong>select</strong>
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also completes if EOF is read from standard input.
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</p>
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<p><strong>Examples</strong></p>
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<ol>
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<li>A select command to select from a list.
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<pre>
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PS3="Please select a number "
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list="alpha beta gamma delta epsilon"
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select value in $list ; do
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echo Value for selection $REPLY is $value
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break
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done
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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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