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<span class="version">v0.8.0</span>
<span class="status">~96% POSIX Compliant</span>
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<a href="index.html">Rush Shell Documentation</a> → <span>POSIX Compliance</span>
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<div class="compliance-hero">
<h1>✅ POSIX Compliance Progress</h1>
<p>Comprehensive status of Rush Shell's compliance with IEEE Std 1003.1-2008 (POSIX sh)</p>
<div class="compliance-overview">
<div class="compliance-meter">
<div class="meter-container">
<div class="meter-bar">
<div class="meter-fill" style="width: 96%"></div>
</div>
<div class="meter-label">96% Complete</div>
</div>
</div>
<div class="compliance-stats">
<div class="stat-item">
<div class="stat-number">96%</div>
<div class="stat-label">Overall Compliance</div>
</div>
<div class="stat-item">
<div class="stat-number">32</div>
<div class="stat-label">Built-in Commands</div>
</div>
<div class="stat-item">
<div class="stat-number">499+</div>
<div class="stat-label">Test Functions</div>
</div>
</div>
</div>
</div>
<section id="shell-language">
<h2>1. Shell Command Language</h2>
<div class="compliance-section">
<h3>1.1 Shell Introduction</h3>
<div class="compliance-grid">
<div class="compliance-item implemented">
<span class="status-icon">✅</span>
<span class="item-text">Interactive shell with prompt</span>
</div>
<div class="compliance-item implemented">
<span class="status-icon">✅</span>
<span class="item-text">Script execution mode</span>
</div>
<div class="compliance-item implemented">
<span class="status-icon">✅</span>
<span class="item-text">Command string execution (-c option)</span>
</div>
<div class="compliance-item implemented">
<span class="status-icon">✅</span>
<span class="item-text">Real-time signal trap execution</span>
</div>
<div class="compliance-item implemented">
<span class="status-icon">✅</span>
<span class="item-text">Signal handling (SIGINT, SIGTERM)</span>
</div>
<div class="compliance-item implemented">
<span class="status-icon">✅</span>
<span class="item-text">Signal queue with bounded memory</span>
</div>
</div>
</div>
<div class="compliance-section">
<h3>1.2 Quoting</h3>
<div class="compliance-grid">
<div class="compliance-item implemented">
<span class="status-icon">✅</span>
<span class="item-text">Single quotes ('...')</span>
</div>
<div class="compliance-item implemented">
<span class="status-icon">✅</span>
<span class="item-text">Double quotes ("...")</span>
</div>
<div class="compliance-item implemented">
<span class="status-icon">✅</span>
<span class="item-text">Backslash escaping</span>
</div>
<div class="compliance-item implemented">
<span class="status-icon">✅</span>
<span class="item-text">Quote removal</span>
</div>
</div>
</div>
<div class="compliance-section">
<h3>1.3 Token Recognition</h3>
<div class="compliance-grid">
<div class="compliance-item implemented">
<span class="status-icon">✅</span>
<span class="item-text">Tokenization of words, operators, newlines</span>
</div>
<div class="compliance-item implemented">
<span class="status-icon">✅</span>
<span class="item-text">Reserved words (if, then, else, elif, fi, case, in, esac)</span>
</div>
<div class="compliance-item implemented">
<span class="status-icon">✅</span>
<span class="item-text">Operators: | <> >> ; ;;</span>
</div>
<div class="compliance-item implemented">
<span class="status-icon">✅</span>
<span class="item-text">Command substitution tokens ($(...) and `...`)</span>
</div>
</div>
</div>
<div class="compliance-section">
<h3>1.4 Reserved Words</h3>
<div class="compliance-grid">
<div class="compliance-item implemented">
<span class="status-icon">✅</span>
<span class="item-text">if, then, else, elif, fi</span>
</div>
<div class="compliance-item implemented">
<span class="status-icon">✅</span>
<span class="item-text">case, in, esac</span>
</div>
<div class="compliance-item implemented">
<span class="status-icon">✅</span>
<span class="item-text">while, until, for, do, done</span>
</div>
<div class="compliance-item implemented">
<span class="status-icon">✅</span>
<span class="item-text">function</span>
</div>
</div>
</div>
<div class="compliance-section">
<h3>1.5 Parameters and Variables</h3>
<div class="compliance-grid">
<div class="compliance-item implemented">
<span class="status-icon">✅</span>
<span class="item-text">Variable assignment (VAR=value)</span>
</div>
<div class="compliance-item implemented">
<span class="status-icon">✅</span>
<span class="item-text">Variable expansion ($VAR and ${VAR} - both syntaxes supported)</span>
</div>
<div class="compliance-item implemented">
<span class="status-icon">✅</span>
<span class="item-text">Special parameters: $? $$ $0 $LINENO (with ${VAR} brace syntax support)</span>
</div>
<div class="compliance-item implemented">
<span class="status-icon">✅</span>
<span class="item-text">Positional parameters ($1, $2, ...)</span>
</div>
<div class="compliance-item implemented">
<span class="status-icon">✅</span>
<span class="item-text">Special parameters: $* $@ $# $! $-</span>
</div>
<div class="compliance-item implemented">
<span class="status-icon">✅</span>
<span class="item-text">Parameter expansion with modifiers</span>
</div>
<div class="compliance-item implemented">
<span class="status-icon">✅</span>
<span class="item-text">Arithmetic expansion ($((...)))</span>
</div>
<div class="compliance-item implemented">
<span class="status-icon">✅</span>
<span class="item-text">PS4 variable expansion for xtrace output (set -x)</span>
</div>
</div>
</div>
<div class="compliance-section">
<h3>1.6 Word Expansions</h3>
<div class="compliance-grid">
<div class="compliance-item implemented">
<span class="status-icon">✅</span>
<span class="item-text">Tilde expansion (~)</span>
</div>
<div class="compliance-item implemented">
<span class="status-icon">✅</span>
<span class="item-text">Parameter expansion ($VAR)</span>
</div>
<div class="compliance-item implemented">
<span class="status-icon">✅</span>
<span class="item-text">Command substitution ($(...) and `...`)</span>
</div>
<div class="compliance-item implemented">
<span class="status-icon">✅</span>
<span class="item-text">Pathname expansion (globbing with *, ?, [...])</span>
</div>
<div class="compliance-item implemented">
<span class="status-icon">✅</span>
<span class="item-text">Brace expansion ({a,b,c}, {1..5}, {a..z})</span>
</div>
<div class="compliance-item implemented">
<span class="status-icon">✅</span>
<span class="item-text">Arithmetic expansion</span>
</div>
</div>
</div>
<div class="compliance-section">
<h3>1.7 Redirection</h3>
<div class="compliance-grid">
<div class="compliance-item implemented">
<span class="status-icon">✅</span>
<span class="item-text">Input redirection (<)</span>
</div>
<div class="compliance-item implemented">
<span class="status-icon">✅</span>
<span class="item-text">Output redirection (>)</span>
</div>
<div class="compliance-item implemented">
<span class="status-icon">✅</span>
<span class="item-text">Append redirection (>>)</span>
</div>
<div class="compliance-item implemented">
<span class="status-icon">✅</span>
<span class="item-text">Here-document (<<)</span>
</div>
<div class="compliance-item implemented">
<span class="status-icon">✅</span>
<span class="item-text">Here-string (<<<)</span>
</div>
<div class="compliance-item implemented">
<span class="status-icon">✅</span>
<span class="item-text">File descriptor duplication (N>&M, N<&M)</span>
</div>
<div class="compliance-item implemented">
<span class="status-icon">✅</span>
<span class="item-text">File descriptor closing (N>&-, N<&-)</span>
</div>
<div class="compliance-item implemented">
<span class="status-icon">✅</span>
<span class="item-text">File descriptor read/write (N<>)</span>
</div>
</div>
</div>
<div class="compliance-section">
<h3>1.8 Exit Status and Errors</h3>
<div class="compliance-grid">
<div class="compliance-item implemented">
<span class="status-icon">✅</span>
<span class="item-text">Exit status from commands</span>
</div>
<div class="compliance-item implemented">
<span class="status-icon">✅</span>
<span class="item-text">Special parameter $? for last exit status</span>
</div>
<div class="compliance-item implemented">
<span class="status-icon">✅</span>
<span class="item-text">Error reporting for syntax errors</span>
</div>
</div>
</div>
</section>
<section id="shell-commands">
<h2>2. Shell Commands</h2>
<div class="compliance-section">
<h3>2.1 Simple Commands</h3>
<div class="compliance-grid">
<div class="compliance-item implemented">
<span class="status-icon">✅</span>
<span class="item-text">Simple command execution</span>
</div>
<div class="compliance-item implemented">
<span class="status-icon">✅</span>
<span class="item-text">Built-in command execution</span>
</div>
<div class="compliance-item implemented">
<span class="status-icon">✅</span>
<span class="item-text">External command execution with PATH search</span>
</div>
</div>
</div>
<div class="compliance-section">
<h3>2.2 Pipelines</h3>
<div class="compliance-grid">
<div class="compliance-item implemented">
<span class="status-icon">✅</span>
<span class="item-text">Pipeline execution (|)</span>
</div>
<div class="compliance-item implemented">
<span class="status-icon">✅</span>
<span class="item-text">Pipeline exit status (last command's status)</span>
</div>
</div>
</div>
<div class="compliance-section">
<h3>2.3 Compound Commands</h3>
<h4>2.3.1 Grouping</h4>
<div class="compliance-grid">
<div class="compliance-item implemented">
<span class="status-icon">✅</span>
<span class="item-text">Subshell ((...))</span>
</div>
<div class="compliance-item implemented">
<span class="status-icon">✅</span>
<span class="item-text">Command grouping {...}</span>
</div>
</div>
<h4>2.3.2 Conditional Constructs</h4>
<div class="compliance-grid">
<div class="compliance-item implemented">
<span class="status-icon">✅</span>
<span class="item-text">if/elif/else/fi</span>
</div>
<div class="compliance-item implemented">
<span class="status-icon">✅</span>
<span class="item-text">while loops</span>
</div>
<div class="compliance-item implemented">
<span class="status-icon">✅</span>
<span class="item-text">until loops</span>
</div>
<div class="compliance-item implemented">
<span class="status-icon">✅</span>
<span class="item-text">for loops</span>
</div>
</div>
<h4>2.3.3 Case Construct</h4>
<div class="compliance-grid">
<div class="compliance-item implemented">
<span class="status-icon">✅</span>
<span class="item-text">case/in/esac with glob patterns</span>
</div>
<div class="compliance-item implemented">
<span class="status-icon">✅</span>
<span class="item-text">Pattern alternatives (|)</span>
</div>
<div class="compliance-item implemented">
<span class="status-icon">✅</span>
<span class="item-text">Default case (*)</span>
</div>
</div>
</div>
<div class="compliance-section">
<h3>2.4 Functions</h3>
<div class="compliance-grid">
<div class="compliance-item implemented">
<span class="status-icon">✅</span>
<span class="item-text">Function definition and execution</span>
</div>
<div class="compliance-item implemented">
<span class="status-icon">✅</span>
<span class="item-text">Local variables in functions</span>
</div>
<div class="compliance-item implemented">
<span class="status-icon">✅</span>
<span class="item-text">Function introspection (declare -f)</span>
</div>
</div>
</div>
</section>
<section id="builtins">
<h2>3. Special Built-in Utilities</h2>
<div class="builtins-status">
<div class="status-summary">
<h3>Implementation Status</h3>
<div class="status-badges">
<span class="badge implemented">32 Implemented</span>
<span class="badge missing">4 Missing</span>
</div>
</div>
<div class="builtins-grid">
<div class="builtins-column">
<h4>Required Special Built-ins</h4>
<div class="compliance-grid">
<div class="compliance-item implemented">
<span class="status-icon">✅</span>
<span class="item-text">break</span>
</div>
<div class="compliance-item implemented">
<span class="status-icon">✅</span>
<span class="item-text">: (colon)</span>
</div>
<div class="compliance-item implemented">
<span class="status-icon">✅</span>
<span class="item-text">continue</span>
</div>
<div class="compliance-item missing">
<span class="status-icon">❌</span>
<span class="item-text">eval</span>
</div>
<div class="compliance-item missing">
<span class="status-icon">❌</span>
<span class="item-text">exec</span>
</div>
<div class="compliance-item implemented">
<span class="status-icon">✅</span>
<span class="item-text">exit</span>
</div>
<div class="compliance-item implemented">
<span class="status-icon">✅</span>
<span class="item-text">export</span>
</div>
<div class="compliance-item missing">
<span class="status-icon">❌</span>
<span class="item-text">readonly</span>
</div>
<div class="compliance-item implemented">
<span class="status-icon">✅</span>
<span class="item-text">return</span>
</div>
<div class="compliance-item implemented">
<span class="status-icon">✅</span>
<span class="item-text">set</span>
</div>
<div class="compliance-item implemented">
<span class="status-icon">✅</span>
<span class="item-text">shift</span>
</div>
<div class="compliance-item implemented">
<span class="status-icon">✅</span>
<span class="item-text">times</span>
</div>
<div class="compliance-item implemented">
<span class="status-icon">✅</span>
<span class="item-text">trap</span>
</div>
<div class="compliance-item missing">
<span class="status-icon">❌</span>
<span class="item-text">umask</span>
</div>
<div class="compliance-item implemented">
<span class="status-icon">✅</span>
<span class="item-text">unset</span>
</div>
<div class="compliance-item implemented">
<span class="status-icon">✅</span>
<span class="item-text">wait</span>
</div>
</div>
</div>
<div class="builtins-column">
<h4>Currently Implemented (32)</h4>
<div class="implemented-list">
<div class="builtin-tag">: (colon)</div>
<div class="builtin-tag">alias</div>
<div class="builtin-tag">bg</div>
<div class="builtin-tag">break</div>
<div class="builtin-tag">cd</div>
<div class="builtin-tag">continue</div>
<div class="builtin-tag">declare</div>
<div class="builtin-tag">dirs</div>
<div class="builtin-tag">env</div>
<div class="builtin-tag">exit</div>
<div class="builtin-tag">export</div>
<div class="builtin-tag">fg</div>
<div class="builtin-tag">help</div>
<div class="builtin-tag">jobs</div>
<div class="builtin-tag">kill</div>
<div class="builtin-tag">popd</div>
<div class="builtin-tag">pushd</div>
<div class="builtin-tag">pwd</div>
<div class="builtin-tag">return</div>
<div class="builtin-tag">set</div>
<div class="builtin-tag">set_color_scheme</div>
<div class="builtin-tag">set_colors</div>
<div class="builtin-tag">set_condensed</div>
<div class="builtin-tag">shift</div>
<div class="builtin-tag">source</div>
<div class="builtin-tag">test</div>
<div class="builtin-tag">times</div>
<div class="builtin-tag">trap</div>
<div class="builtin-tag">type</div>
<div class="builtin-tag">unalias</div>
<div class="builtin-tag">unset</div>
<div class="builtin-tag">wait</div>
</div>
</div>
</div>
</div>
</section>
<section id="priorities">
<h2>🎯 Implementation Priorities</h2>
<div class="priority-sections">
<div class="priority-section high">
<h3>High Priority (Core POSIX Features)</h3>
<ol>
<li><strong>Missing Built-ins</strong>
<ul>
<li>eval</li>
<li>exec</li>
<li>readonly</li>
<li>umask</li>
</ul>
</li>
</ol>
</div>
<div class="priority-section low">
<h3>Low Priority</h3>
<ol>
<li><strong>Advanced Features</strong>
<ul>
<li>Command line editing enhancements</li>
<li>History expansion (!!)</li>
<li>Extended globbing</li>
</ul>
</li>
</ol>
</div>
</div>
</section>
<section id="testing">
<h2>🧪 Testing Status</h2>
<div class="testing-overview">
<div class="testing-stats">
<div class="test-stat">
<div class="test-number">499+</div>
<div class="test-label">Test Functions</div>
</div>
<div class="test-stat">
<div class="test-number">100%</div>
<div class="test-label">Core Components Covered</div>
</div>
<div class="test-stat">
<div class="test-number">32</div>
<div class="test-label">Built-ins Tested</div>
</div>
</div>
<div class="test-categories">
<h3>Test Coverage Areas</h3>
<div class="compliance-grid">
<div class="compliance-item implemented">
<span class="status-icon">✅</span>
<span class="item-text">Lexer tests (tokenization, expansion, quoting, arithmetic,
parameter expansion)</span>
</div>
<div class="compliance-item implemented">
<span class="status-icon">✅</span>
<span class="item-text">Parser tests (AST construction, control structures,
if/elif/else, case statements)</span>
</div>
<div class="compliance-item implemented">
<span class="status-icon">✅</span>
<span class="item-text">Executor tests (command execution, pipelines, redirections,
built-in commands)</span>
</div>
<div class="compliance-item implemented">
<span class="status-icon">✅</span>
<span class="item-text">Built-in tests (all implemented commands with comprehensive
coverage)</span>
</div>
<div class="compliance-item implemented">
<span class="status-icon">✅</span>
<span class="item-text">Integration tests (end-to-end scenarios, variable expansion,
control structures)</span>
</div>
<div class="compliance-item implemented">
<span class="status-icon">✅</span>
<span class="item-text">Arithmetic expansion tests (operators, precedence,
variables, error handling)</span>
</div>
<div class="compliance-item implemented">
<span class="status-icon">✅</span>
<span class="item-text">Parameter expansion tests (all modifiers, pattern matching,
edge cases)</span>
</div>
<div class="compliance-item implemented">
<span class="status-icon">✅</span>
<span class="item-text">Brace expansion tests (simple lists, ranges, nested braces,
cartesian products)</span>
</div>
<div class="compliance-item implemented">
<span class="status-icon">✅</span>
<span class="item-text">State management tests (variables, environment, positional
parameters)</span>
</div>
</div>
</div>
<div class="test-gaps">
<h3>Recently Implemented Features</h3>
<div class="compliance-grid">
<div class="compliance-item implemented">
<span class="status-icon">✅</span>
<span class="item-text">Job control: bg, fg, jobs, kill, wait (100+ test
cases)</span>
</div>
<div class="compliance-item implemented">
<span class="status-icon">✅</span>
<span class="item-text">Loop control builtins: break and continue (29 test
cases)</span>
</div>
<div class="compliance-item implemented">
<span class="status-icon">✅</span>
<span class="item-text">Subshells (60+ test cases)</span>
</div>
<div class="compliance-item implemented">
<span class="status-icon">✅</span>
<span class="item-text">File descriptor operations (30+ test cases)</span>
</div>
<div class="compliance-item implemented">
<span class="status-icon">✅</span>
<span class="item-text">Here-documents and here-strings</span>
</div>
<div class="compliance-item implemented">
<span class="status-icon">✅</span>
<span class="item-text">Enhanced trap system with signal queue</span>
</div>
</div>
</div>
<div class="test-gaps">
<h3>Areas Without Tests (Unimplemented Features)</h3>
<div class="compliance-grid">
<div class="compliance-item missing">
<span class="status-icon">❌</span>
<span class="item-text">Missing built-in functionality (eval, exec, readonly,
umask)</span>
</div>
</div>
</div>
</div>
</section>
<section id="breakdown">
<h2>📊 Compliance Breakdown</h2>
<div class="breakdown-grid">
<div class="breakdown-card">
<h3>Category Breakdown</h3>
<div class="breakdown-list">
<div class="breakdown-item">
<span class="category">Basic Execution</span>
<span class="percentage implemented">95%</span>
</div>
<div class="breakdown-item">
<span class="category">Control Structures</span>
<span class="percentage implemented">95%</span>
</div>
<div class="breakdown-item">
<span class="category">Built-in Commands</span>
<span class="percentage implemented">96%</span>
</div>
<div class="breakdown-item">
<span class="category">Expansions</span>
<span class="percentage implemented">98%</span>
</div>
<div class="breakdown-item">
<span class="category">Redirections</span>
<span class="percentage implemented">95%</span>
</div>
<div class="breakdown-item">
<span class="category">Job Control</span>
<span class="percentage implemented">100%</span>
</div>
<div class="breakdown-item">
<span class="category">Advanced Features</span>
<span class="percentage partial">40%</span>
</div>
</div>
</div>
<div class="breakdown-card">
<h3>Certification Path</h3>
<p>To achieve full POSIX compliance, focus on implementing the missing features listed in
the priority sections above. Rush already has a solid foundation with:</p>
<ul>
<li>✅ Comprehensive command execution and parsing</li>
<li>✅ Advanced expansion engines (parameter, arithmetic, brace)</li>
<li>✅ Full control structure support</li>
<li>✅ Extensive built-in command suite</li>
<li>✅ Thorough test coverage</li>
</ul>
</div>
</div>
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