Learning Perl, 7th Edition

Index

Symbols

• ! (negation operator), The unless Control Structure
• # (pound sign), What’s Inside That Program?, Adding Whitespace with /x
• #! (shebang) line, What’s Inside That Program?
• $ (dollar sign), A Simple Program, Scalar Variables, Interpolation of Scalar Variables into Strings
• $! special variable, Fatal Errors with die, File Test Operators, Changing the Directory
• $" special variable, Output to Standard Output
• $$ special variable, Using Backquotes to Capture Output
• $' special variable, The Automatic Match Variables
• $= special variable, Subroutine Signatures
• $? special variable, Processes as Filehandles
• $@ special variable, More Advanced Error Handling
• $HOME shell variable, The system Function
• $_ special variable, Perl’s Favorite Default: $_, Sequences, Beginning and End-of-Line Anchors
• $` special variable, The Automatic Match Variables
• $| special variable, Changing the Default Output Filehandle
• % (modulus operator), Numeric Operators
• % (percent sign), Formatted Output with printf-Arrays and printf, The Hash as a Whole
• & (ampersand), Subroutines, Omitting the Ampersand-Omitting the Ampersand
• & (bitwise-and operator), Bitwise Operators
• && (logical AND operator), Logical Operators
• ' (apostrophe), Hash Element Interpolation
• ' (single quote), Single-Quoted String Literals
• () parentheses
  • capture groups, Grouping in Patterns-Grouping in Patterns
  • match variables and, The Match Variables-The Automatic Match Variables
  • noncapturing, Noncapturing Parentheses, The split Operator
  • order of precedence, Operator Precedence ...