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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" target="main"><html><head><meta name="generator" content="HTML Tidy, see www.w3.org" target="main"><link type="text/css" rel="stylesheet" href="../utilities/style.css" target="main"><title>Shell</title></head><body bgcolor="white"><basefont size="3" target="main"> <h2>Shell Command Language</h2><ul><li><a href="../utilities/xcu_chap02.html" target="main">Shell Introduction</a></li><li><a href="../utilities/xcu_chap02.html#tag_02_02" target="main">Quoting</a><ul><li><a href="../utilities/xcu_chap02.html#tag_02_02_01" target="main">Escape Character (Backslash)</a></li><li><a href="../utilities/xcu_chap02.html#tag_02_02_02" target="main">Single-Quotes</a></li><li><a href="../utilities/xcu_chap02.html#tag_02_02_03" target="main">Double-Quotes</a></li></ul></li><li><a href="../utilities/xcu_chap02.html#tag_02_03" target="main">Token Recognition</a><ul><li><a href="../utilities/xcu_chap02.html#tag_02_03_01" target="main">Alias Substitution</a></li></ul></li><li><a href="../utilities/xcu_chap02.html#tag_02_04" target="main">Reserved Words</a></li><li><a href="../utilities/xcu_chap02.html#tag_02_05" target="main">Parameters and Variables</a><ul><li><a href="../utilities/xcu_chap02.html#tag_02_05_01" target="main">Positional Parameters</a></li><li><a href="../utilities/xcu_chap02.html#tag_02_05_02" target="main">Special Parameters</a></li><li><a href="../utilities/xcu_chap02.html#tag_02_05_03" target="main">Shell Variables</a></li></ul></li><li><a href="../utilities/xcu_chap02.html#tag_02_06" target="main">Word Expansions</a><ul><li><a href="../utilities/xcu_chap02.html#tag_02_06_01" target="main">Tilde Expansion</a></li><li><a href="../utilities/xcu_chap02.html#tag_02_06_02" target="main">Parameter Expansion</a></li><li><a href="../utilities/xcu_chap02.html#tag_02_06_03" target="main">Command Substitution</a></li><li><a href="../utilities/xcu_chap02.html#tag_02_06_04" target="main">Arithmetic Expansion</a></li><li><a href="../utilities/xcu_chap02.html#tag_02_06_05" target="main">Field Splitting</a></li><li><a href="../utilities/xcu_chap02.html#tag_02_06_06" target="main">Pathname Expansion</a></li><li><a href="../utilities/xcu_chap02.html#tag_02_06_07" target="main">Quote Removal</a></li></ul></li><li><a href="../utilities/xcu_chap02.html#tag_02_07" target="main">Redirection</a><ul><li><a href="../utilities/xcu_chap02.html#tag_02_07_01" target="main">Redirecting Input</a></li><li><a href="../utilities/xcu_chap02.html#tag_02_07_02" target="main">Redirecting Output</a></li><li><a href="../utilities/xcu_chap02.html#tag_02_07_03" target="main">Appending Redirected Output</a></li><li><a href="../utilities/xcu_chap02.html#tag_02_07_04" target="main">Here-Document</a></li><li><a href="../utilities/xcu_chap02.html#tag_02_07_05" target="main">Duplicating an Input File Descriptor</a></li><li><a href="../utilities/xcu_chap02.html#tag_02_07_06" target="main">Duplicating an Output File Descriptor</a></li><li><a href="../utilities/xcu_chap02.html#tag_02_07_07" target="main">Open File Descriptors for Reading and Writing</a></li></ul></li><li><a href="../utilities/xcu_chap02.html#tag_02_08" target="main">Exit Status and Errors</a><ul><li><a href="../utilities/xcu_chap02.html#tag_02_08_01" target="main">Consequences of Shell Errors</a></li><li><a href="../utilities/xcu_chap02.html#tag_02_08_02" target="main">Exit Status for Commands</a></li></ul></li><li><a href="../utilities/xcu_chap02.html#tag_02_09" target="main">Shell Commands</a><ul><li><a href="../utilities/xcu_chap02.html#tag_02_09_01" target="main">Simple Commands</a></li><li><a href="../utilities/xcu_chap02.html#tag_02_09_02" target="main">Pipelines</a></li><li><a href="../utilities/xcu_chap02.html#tag_02_09_03" target="main">Lists</a></li><li><a href="../utilities/xcu_chap02.html#tag_02_09_04" target="main">Compound Commands</a></li><li><a href="../utilities/xcu_chap02.html#tag_02_09_05" target="main">Function Definition Command</a></li></ul></li><li><a href="../utilities/xcu_chap02.html#tag_02_10" target="main">Shell Grammar</a><ul><li><a href="../utilities/xcu_chap02.html#tag_02_10_01" target="main">Shell Grammar Lexical Conventions</a></li><li><a href="../utilities/xcu_chap02.html#tag_02_10_02" target="main">Shell Grammar Rules</a></li></ul></li><li><a href="../utilities/xcu_chap02.html#tag_02_11" target="main">Signals and Error Handling</a></li><li><a href="../utilities/xcu_chap02.html#tag_02_12" target="main">Shell Execution Environment</a></li><li><a href="../utilities/xcu_chap02.html#tag_02_13" target="main">Pattern Matching Notation</a><ul><li><a href="../utilities/xcu_chap02.html#tag_02_13_01" target="main">Patterns Matching a Single Character</a></li><li><a href="../utilities/xcu_chap02.html#tag_02_13_02" target="main">Patterns Matching Multiple Characters</a></li><li><a href="../utilities/xcu_chap02.html#tag_02_13_03" target="main">Patterns Used for Filename Expansion</a></li></ul></li><li><a href="../utilities/xcu_chap02.html#tag_02_14" target="main">Special Built-In Utilities</a></li></ul></body></html>⌨️ 快捷键说明
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