Shell Command Language

• 2.1 Shell Introduction
• 2.2 Quoting
  • 2.2.1 Escape Character (Backslash)
  • 2.2.2 Single-Quotes
  • 2.2.3 Double-Quotes
  • 2.2.4 Dollar-Single-Quotes
• 2.3 Token Recognition
  • 2.3.1 Alias Substitution
• 2.4 Reserved Words
• 2.5 Parameters and Variables
  • 2.5.1 Positional Parameters
  • 2.5.2 Special Parameters
  • 2.5.3 Shell Variables
• 2.6 Word Expansions
  • 2.6.1 Tilde Expansion
  • 2.6.2 Parameter Expansion
    • Examples
  • 2.6.3 Command Substitution
  • 2.6.4 Arithmetic Expansion
    • Examples
  • 2.6.5 Field Splitting
  • 2.6.6 Pathname Expansion
  • 2.6.7 Quote Removal
• 2.7 Redirection
  • 2.7.1 Redirecting Input
  • 2.7.2 Redirecting Output
  • 2.7.3 Appending Redirected Output
  • 2.7.4 Here-Document
    • Examples
  • 2.7.5 Duplicating an Input File Descriptor
  • 2.7.6 Duplicating an Output File Descriptor
  • 2.7.7 Open File Descriptors for Reading and Writing
• 2.8 Exit Status and Errors
  • 2.8.1 Consequences of Shell Errors
  • 2.8.2 Exit Status for Commands
• 2.9 Shell Commands
  • 2.9.1 Simple Commands
  • 2.9.2 Pipelines
  • 2.9.3 Lists
  • 2.9.4 Compound Commands
  • 2.9.5 Function Definition Command
• 2.10 Shell Grammar
  • 2.10.1 Shell Grammar Lexical Conventions
  • 2.10.2 Shell Grammar Rules
• 2.11 Job Control
• 2.12 Signals and Error Handling
• 2.13 Shell Execution Environment
• 2.14 Pattern Matching Notation
  • 2.14.1 Patterns Matching a Single Character
  • 2.14.2 Patterns Matching Multiple Characters
  • 2.14.3 Patterns Used for Filename Expansion
• 2.15 Special Built-In Utilities
  • break
  • colon
  • continue
  • dot
  • eval
  • exec
  • exit
  • export
  • readonly
  • return
  • set
  • shift
  • times
  • trap
  • unset