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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"><html><head><!-- Copyright 1997 The Open Group, All Rights Reserved --><title>Shell Command Language Index</title></head><body bgcolor=white><center><font size=2>The Single UNIX ® Specification, Version 2<br>Copyright © 1997 The Open Group</font></center><hr size=2 noshade><blockquote><CENTER><CODE><H1>Shell Command Language Index</H1><P><B><a href="chap2.html#tag_001">Shell Command Language</a></B><P><a href="chap2.html#tag_001_001">Shell Introduction</a><P><B><a href="chap2.html#tag_001_002">Quoting</a></B><P>· <a href="chap2.html#tag_001_002_001">Escape Character (Backslash)</a>· <a href="chap2.html#tag_001_002_002">Single-quotes</a>· <a href="chap2.html#tag_001_002_003">Double-quotes</a><P><B><a href="chap2.html#tag_001_003">Token Recognition</a></B><P>· <a href="chap2.html#tag_001_003_001">Alias Substitution</a><P><B><a href="chap2.html#tag_001_004">Reserved Words</a></B><P><B><a href="chap2.html#tag_001_005">Parameters and Variables</a></B><P>· <a href="chap2.html#tag_001_005_001">Positional Parameters</a>· <a href="chap2.html#tag_001_005_002">Special Parameters</a>· <a href="chap2.html#tag_001_005_003">Shell Variables</a><P><B><a href="chap2.html#tag_001_006">Word Expansions</a></B><P>· <a href="chap2.html#tag_001_006_001">Tilde Expansion</a>· <a href="chap2.html#tag_001_006_002">Parameter Expansion</a>· <a href="chap2.html#tag_001_006_002_001">Examples</a>· <a href="chap2.html#tag_001_006_003">Command Substitution</a>· <a href="chap2.html#tag_001_006_004">Arithmetic Expansion</a>· <a href="chap2.html#tag_001_006_005">Field Splitting</a>· <a href="chap2.html#tag_001_006_006">Pathname Expansion</a>· <a href="chap2.html#tag_001_006_007">Quote Removal</a><P><B><a href="chap2.html#tag_001_007">Redirection</a></B><P>· <a href="chap2.html#tag_001_007_001">Redirecting Input</a>· <a href="chap2.html#tag_001_007_002">Redirecting Output</a>· <a href="chap2.html#tag_001_007_003">Appending Redirected Output</a>· <a href="chap2.html#tag_001_007_004">Here-document</a>· <a href="chap2.html#tag_001_007_005">Duplicating an Input File Descriptor</a>· <a href="chap2.html#tag_001_007_006">Duplicating an Output File Descriptor</a>· <a href="chap2.html#tag_001_007_007">Open File Descriptors for Reading and Writing</a><P><B><a href="chap2.html#tag_001_008">Exit Status and Errors</a></B><P>· <a href="chap2.html#tag_001_008_001">Consequences of Shell Errors</a>· <a href="chap2.html#tag_001_008_002">Exit Status for Commands</a><P><B><a href="chap2.html#tag_001_009">Shell Commands</a></B><P>· <a href="chap2.html#tag_001_009_001">Simple Commands</a>· <a href="chap2.html#tag_001_009_001_001">Command Search and Execution</a>· <a href="chap2.html#tag_001_009_002">Pipelines</a>· <a href="chap2.html#tag_001_009_002_001">Exit Status</a>· <a href="chap2.html#tag_001_009_003">Lists</a>· <a href="chap2.html#tag_001_009_003_001">Asynchronous Lists</a>· <a href="chap2.html#tag_001_009_003_002">Sequential Lists</a>· <a href="chap2.html#tag_001_009_003_003">AND Lists</a>· <a href="chap2.html#tag_001_009_003_004">OR Lists</a>· <a href="chap2.html#tag_001_009_004">Compound Commands</a>· <a href="chap2.html#tag_001_009_004_001">Grouping Commands</a>· <a href="chap2.html#tag_001_009_004_002">For Loop</a>· <a href="chap2.html#tag_001_009_004_003">Case Conditional Construct</a>· <a href="chap2.html#tag_001_009_004_004">If Conditional Construct</a>· <a href="chap2.html#tag_001_009_004_005">While Loop</a>· <a href="chap2.html#tag_001_009_004_006">Until Loop</a>· <a href="chap2.html#tag_001_009_005">Function Definition Command</a>· <a href="chap2.html#tag_001_009_005_001">Exit Status</a><P><B><a href="chap2.html#tag_001_010">Shell Grammar</a></B><P>· <a href="chap2.html#tag_001_010_001">Shell Grammar Lexical Conventions</a>· <a href="chap2.html#tag_001_010_002">Shell Grammar Rules</a><P><B><a href="chap2.html#tag_001_011">Signals and Error Handling</a></B><P><B><a href="chap2.html#tag_001_012">Shell Execution Environment</a></B><P><B><a href="chap2.html#tag_001_013">Pattern Matching Notation</a></B><P>· <a href="chap2.html#tag_001_013_001">Patterns Matching a Single Character</a>· <a href="chap2.html#tag_001_013_002">Patterns Matching Multiple Characters</a>· <a href="chap2.html#tag_001_013_003">Patterns Used for Filename Expansion</a><P><B><a href="chap2.html#tag_001_014">Special Built-in Utilities</a></B><P>· <a href="chap2.html#tag_001_014_001">break - Exit From for, while or until Loop</a>· <a href="chap2.html#tag_001_014_002">colon - Null Utility</a>· <a href="chap2.html#tag_001_014_003">continue - Continue for, while or until Loop</a>· <a href="chap2.html#tag_001_014_004">dot - Execute Commands in Current Environment</a>· <a href="chap2.html#tag_001_014_005">eval - Construct Command by Concatenating Arguments</a>· <a href="chap2.html#tag_001_014_006">exec - Execute Commands and Open, Close or Copy File Descriptors</a>· <a href="chap2.html#tag_001_014_007">exit - Cause the Shell to Exit</a>· <a href="chap2.html#tag_001_014_008">export - Set Export Attribute for Variables</a>· <a href="chap2.html#tag_001_014_009">readonly - Set Read-only Attribute for Variables</a>· <a href="chap2.html#tag_001_014_010">return - Return from a Function</a>· <a href="chap2.html#tag_001_014_011">set - Set or Unset Options and Positional Parameters</a>· <a href="chap2.html#tag_001_014_012">shift - Shift Positional Parameters</a>· <a href="chap2.html#tag_001_014_013">times - Write Process Times</a>· <a href="chap2.html#tag_001_014_014">trap - Trap Signals</a>· <a href="chap2.html#tag_001_014_015">unset - Unset Values and Attributes of Variables and Functions</a></CODE></blockquote><hr size=2 noshade><center><font size=2>UNIX ® is a registered Trademark of The Open Group.<br>Copyright © 1997 The Open Group<br> [ <a href="../index.html">Main Index</a> | <a href="../xshix.html">XSH</a> | <a href="../xcuix.html">XCU</a> | <a href="../xbdix.html">XBD</a> | <a href="../cursesix.html">XCURSES</a> | <a href="../xnsix.html">XNS</a> ]</font></center><hr size=2 noshade></body></html>⌨️ 快捷键说明
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