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Shellcheck | Awesome Repository
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koalaman/shellcheck

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39,002 stars·1,899 forks·Haskell·gpl-3.0·1 viewwww.shellcheck.net↗

Shellcheck

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Features

  • Static Analysis Tools - Provides automated static analysis to detect errors, portability issues, and logic mistakes in shell scripts.
  • Static Analysis Tools - Provides automated feedback to improve code reliability and maintainability.
  • Linters - Enforces POSIX compliance and identifies common syntax errors or logic flaws within shell script files.
  • Shell Script Linters - Provides automated syntax checking and error correction for shell script parentheses.
  • Static Analysis Linters - Provides automated static analysis to detect syntax errors and potential bugs in shell scripts.
  • Static Analysis Rules - Identifies syntax errors and parsing issues in shell scripts through static analysis.
  • Static Analyzers - Scans source code to identify potential bugs, security vulnerabilities, and deviations from established programming best practices.
  • Portability Checkers - Ensures shell scripts remain compatible across different operating systems and shell interpreters by detecting non-standard or dialect-specific syntax.
  • Shell Scripting Best Practices - Process files using shell globbing patterns instead of command substitution to safely handle filenames containing spaces, wildcards, or special characters.
  • Shell Scripting Linters - Identifies inefficient pipe usage in shell scripts to optimize command execution and prevent redundant data processing.
  • Static Analysis Tools - Traverses the parsed tree structure to identify patterns, logic errors, and non-portable syntax constructs.
  • Interpreter Compatibility Checkers - Identify non-portable script features that conflict with the specified shebang to ensure scripts remain compatible with the intended interpreter.
  • Shell Scripting Best Practices - Provides automated guidance for writing robust and portable shell scripts.
  • Shell Scripting Linters - Order shell redirections by placing the stderr-to-stdout merge after the stdout redirection to ensure both streams are captured as intended.
  • Static Analysis Engines - Applies a collection of modular diagnostic functions against the syntax tree to detect common programming pitfalls.
  • Syntax Validators - Identify malformed shell test expressions where extra characters or missing logical operators follow the closing bracket of a conditional statement.
  • Security Scanners - Prevents common security vulnerabilities like command injection and improper variable expansion by identifying unsafe coding patterns in shell scripts.
  • Shell Security Hardening - Quote all arguments and array-expansion variables to prevent unintended word splitting and globbing when processing script arguments containing spaces or special characters.
  • Code Quality Tools - Enforces best practices and consistent coding standards across shell scripts to improve maintainability and reduce common runtime failures.
  • Shell Syntax Analyzers - Use curly braces when accessing positional parameters greater than nine to ensure the shell interprets the entire number as the parameter index.
  • Parsing Engines - Processes source code into an abstract syntax tree by recursively matching grammar rules against tokens.
  • Shell Parameter Expansion - Determine the length of a string using built-in parameter expansion instead of external utilities to improve script performance and ensure compatibility across different shell environments.
  • Automated Code Reviewers - Inspects scripts for common pitfalls and suggests idiomatic improvements to ensure consistent and robust code execution.
  • Code Formatters - Identify missing spaces after opening braces in shell scripts to prevent syntax errors caused by the shell misinterpreting the brace as a literal character.
  • Cross-Platform Utilities - Detects non-standard or dialect-specific syntax to ensure scripts remain compatible across different operating systems and shell interpreters.
  • Shell Script Optimizers - Remove redundant echo commands wrapping shell command substitutions to improve script performance and preserve exit codes.
  • Shell Scripting Utilities - Wrap invisible terminal control codes in prompt strings with specific delimiters to ensure the shell correctly calculates line length and prevents display wrapping issues.
  • Grammar Parsers - Adapts parsing logic based on the detected shell interpreter to ensure compatibility with specific language standards.
  • Shell Command Substitution - Store the result of a shell command in a variable by wrapping the command in parentheses preceded by a dollar sign for later use in scripts.
  • Shell Pipeline Patterns - Store the result of a pipeline in a variable by wrapping the entire sequence in command substitution syntax to ensure the shell executes the pipeline correctly.
  • Shell Scripting Best Practices - Provides patterns for processing file contents line by line to prevent common shell scripting errors like unintended word splitting.
  • Shell Pattern Validation - Ensure that glob patterns use the equality operator instead of the regular expression operator to prevent unintended matching behavior in conditional expressions.
  • Shell Script Analysis Rules - Invoke the external time utility instead of the shell built-in command by prefixing the call with the command keyword to ensure the correct binary runs.
  • Static Analysis Directives - Allows explicit definition of sourced file paths to enable accurate static analysis of shell scripts.

    • This project is a static analysis tool and linter designed to improve the quality, reliability, and portability of shell scripts. By performing deep structural analysis, it identifies common programming pitfalls, syntax errors, and security vulnerabilities before scripts are executed. It functions as an automated code reviewer that enforces best practices and helps developers maintain consistent, robust code across different operating environments.

    The tool distinguishes itself through its dialect-aware grammar resolution, which adapts its parsing logic based on the specific shell interpreter detected. It utilizes a sophisticated engine that constructs an abstract syntax tree to evaluate logic, quoting, and portability concerns. Developers can exert granular control over the analysis process by using inline directives to suppress specific warnings or configure how the tool resolves external source files.

    The project covers a comprehensive surface of diagnostic capabilities, ranging from fundamental syntax validation to complex logic checks. It provides guidance on idiomatic script construction, including safe file handling, efficient arithmetic operations, and proper command substitution. These features collectively ensure that scripts adhere to POSIX standards and remain compatible across various shell implementations.

    The tool is distributed as a command-line utility, allowing for integration into development workflows to provide immediate feedback on script integrity.