65 lines
2.1 KiB
HTML
65 lines
2.1 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>Patterns</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>Patterns</h2>
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<p>A pattern consists of normal characters, which match themselves,
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and meta-characters. The meta-characters are:</p>
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<p><strong>!</strong>, <strong>*</strong>, <strong>?</strong>, and
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<strong>[</strong></p>
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<p>These characters lose their special meanings if they are quoted.
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When command or variable substitution is performed and the dollar
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sign (<strong>$</strong>) or backquote (<strong>`</strong>) are not
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double quoted, the value of the variable or the output of the
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command is scanned for these characters and they are turned into
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meta-characters.</p>
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<p>An asterisk (<strong>*</strong>) matches any string of
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characters.</p>
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<p>A question mark (<strong>?</strong>) matches any single
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character.</p>
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<p>A left bracket (<strong>[</strong>) introduces a character
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class. The end of the character class is indicated by a right
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bracket (<strong>]</strong>). If the right bracket is missing then
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the left bracket matches a <strong>[</strong> rather than
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introducing a character class. A character class matches any of the
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characters between the square brackets. A range of characters may
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be specified using a minus (<strong>-</strong>). The character
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class may be complemented by making an exclamation mark
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(<strong>!</strong>) the first character of the character
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class.</p>
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<table>
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<tr>
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<td valign="top"><strong>Note:</strong></td>
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<td>Specifying a range of characters may produce different results
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from other systems because EBCDIC characters are not
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contiguous.</td>
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</tr>
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</table>
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<p>To include a right bracket in a character class, make it the
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first character listed (after the <strong>!</strong>, if any). To
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include a minus in a character class, make it the first or last
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character listed.</p>
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</body>
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</html>
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