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Index: 0

• @+ array of ending positions: Special Variables in Alphabetical Order
• $!, portability of: System Interaction
• & (ampersand): Named Unary and File Test Operators
• • address-of operator (in C): Operators Missing from Perl
  • & (bitwise and) operator: Bitwise Operators
  • && (AND) operator: C-Style Logical (Short-Circuit) Operators
  • &&= (assignment) operator: Assignment Operators
  • in filenames: open
  • Perl version 5, changes in use: Verbs
  • prototype character: Prototypes
  • for subroutine names: Variable Syntax
  • • Names
    • Names
    • goto
    • Syntax
    • omitting in prototypes: Prototypes
• * (asterisk): Named Unary and File Test Operators
• • ** (exponentiation)operator: Exponentiation
  • **= (exponentiation assignment) operator: Assignment Operators
  • *= (multiplication assignment) operator: Assignment Operators
  • *? quantifier: Metasymbol Tables
  • metacharacter: The Regular Expression Bestiary
  • • Metacharacters and Metasymbols
  • (multiplicative) operator: Terms and List Operators (Leftward)
  • prototype character: Prototypes
  • quantifier: Quantifiers
  • • Metasymbol Tables
  • in quantifiers: Quantifiers
  • typeglob: Variable Syntax
  • for typeglob names: Names
  • • Typeglobs and Filehandles
• @ (at sign)
• • for array names: Variable Syntax
  • • Variables
  • @- array: Capturing
  • @+ array of ending positions: Capturing
  • @_ arrays: Semantics
  • @_ array: Semantics
  • • Special Variables in Alphabetical Order
  • changes in use, Perl versions: Previous Perl Traps
  • in debugger: Using the Debugger
  • inside strings, escaping with backslash: String Literals
  • in picture lines: Formats
  • prototype character: Prototypes
• \ (backslash)
• • \... metasymbol: Metasymbol Tables
  • entering continued commands in debugger: Debugger Commands
  • to escape metacharacters: The Regular Expression Bestiary
  • • Metacharacters and Metasymbols
  • interpretation by regex parser: When backslashes happen
  • metacharacter: The Regular Expression Bestiary
  • for multiline commands: Using the Debugger
  • \Q notation for backslashing nonalphanumeric characters: String Literals
  • quoted strings, avoiding overuse in: Pick Your Own Quotes
  • quotemeta function for: quotemeta
  • reference operator: Ideographic Unary Operators
  • • The Backslash Operator
• \\ (backslash)
• • double quotes, interpreting with: Singularities
• ` (backtick) operator
• • shell developing, Perl vs.: Shell Traps
• ! (bang)
• • ! (logical negation) operator
  • • overloading: Overloadable Operators
  • !! debugger command: Actions and Command Execution
  • !~ (binding) operator: Binding Operators
  • • using with pattern matching operators: Pattern-Matching Operators
  • complemented character sets, using for: Defining your own character properties
  • in debugger commands: Actions and Command Execution
  • logical negation operator: Ideographic Unary Operators
  • != (not equal to) operator: Some Numeric and String Comparison Operators
  • • Universal Blunders
• {} braces: Universal Blunders
• [] (brackets)
• • [ metacharacter: The Regular Expression Bestiary
  • • Metacharacters and Metasymbols
  • [...] character class: Metasymbol Tables
  • character classes: Metasymbol Tables
  • • Custom Character Classes
  • to match characters: The Little Engine That /Could(n't)?/
  • precedence of: Terms and List Operators (Leftward)
• ^ (caret) ;line boundary: Beginnings: The \A and ^ Assertions
• : (colon)
• • :: in module names, translating to system directory separators: Using Modules
  • :: for package identifiers: Or Leave the Quotes Out Entirely
  • • Packages
    • Previous Perl Traps
  • :: in fully qualified names: Names
• , (comma)
• • delimiting list values: List Values and Arrays
  • • List Values and Arrays
  • error in print statements: Universal Blunders
  • key/value pairs and: Hashes.
  • • Hashes
  • large numbers and: Numeric Literals
  • operator: Comma Operators
  • • Comma Operators
    • (see also => operator)
    • in scalar context: Previous Perl Traps
  • as separator: Complexities
• $^T ($BASETIME): Named Unary and File Test Operators
• $. ($INPUT_LINE_NUMBER): Range Operator
• $ (dollar sign): Hashes.
• • prototype character: Prototypes
  • in debugger: Using the Debugger
  • $# prefix: Array Length
  • $$ (current process ID): Names
  • $? (exit status, last child process): Names
  • $ variables
  • • $^O variable: Portable Perl
  • line boundary: Endings: The \z, \Z, and $ Assertions
  • in matching: The m// Operator (Matching)
  • metacharacter: The Regular Expression Bestiary
  • • Metacharacters and Metasymbols
  • for scalar variable names: Arrays.
  • • Variables
  • scalar variable interpolation and: String Literals
  • signifying scalar variables: Variable Syntax
  • word boundary: Nailing Things Down
• $! variable: Logical Operators
• $ variables
• • $0 ($PROGRAM_NAME): Special Variables in Alphabetical Order
  • $a and $b (sort variables): Special Variables in Alphabetical Order
  • @': Capturing
  • @&: Capturing
  • $' ($POSTMATCH): Time Efficiency
  • • Special Variables in Alphabetical Order
  • $*: Special Variables in Alphabetical Order
  • $@ ($EVAL_ERROR): Special Variables in Alphabetical Order
  • $\ ($OUTPUT_RECORD_SEPARATOR): Special Variables in Alphabetical Order
  • $` ($PREMATCH): Time Efficiency
  • • Special Variables in Alphabetical Order
  • $! ($OS_ERROR): Special Variables in Alphabetical Order
  • ${^WARNING_BITS}: Special Variables in Alphabetical Order
  • $] ($PERL_VERSION): Special Variables in Alphabetical Order
  • $^ ($FORMAT_TOP_NAME): Format Variables
  • • Footers
    • Universal Blunders
    • Special Variables in Alphabetical Order
  • $^A ($ACCUMULATOR): Accessing Formatting Internals
  • • Special Variables in Alphabetical Order
    • formline function output: formline
  • $^C ($COMPILING): Special Variables in Alphabetical Order
  • $^D ($DEBUGGING): Switches
  • • Special Variables in Alphabetical Order
  • $^E ($EXTENDED_OS_ERROR): Special Variables in Alphabetical Order
  • $^F ($SYSTEM_FD_MAX): Special Variables in Alphabetical Order
  • $^H: Special Variables in Alphabetical Order
  • $^I ($INPLACE_EDIT): Special Variables in Alphabetical Order
  • $^L ($FORMAT_LINEFEED): Format Variables
  • $^M: Special Variables in Alphabetical Order
  • $^O ($OSNAME): Special Variables in Alphabetical Order
  • $^P ($PERLDB): Special Variables in Alphabetical Order
  • $^S ($EXCEPTIONS_BEING_CAUGHT): Special Variables in Alphabetical Order
  • $^T ($BASETIME): Special Variables in Alphabetical Order
  • $^V ($PERL_VERSION): Special Variables in Alphabetical Order
  • $^W ($WARNING): Special Variables in Alphabetical Order
  • $^X ($EXECUTABLE_NAME): Special Variables in Alphabetical Order
  • $: ($FORMAT_LINE_BREAK_CHARACTERS): Formats
  • • Special Variables in Alphabetical Order
  • $, ($LIST_SEPARATOR): Special Variables in Alphabetical Order
  • $$ ($PROCESS_ID): Special Variables in Alphabetical Order
  • $. ($INPUT_LINE_NUMBER): Special Variables in Alphabetical Order
  • • resetting with close function: close
  • $= ($FORMAT_LINES_PER_PAGE): Format Variables
  • • Special Variables in Alphabetical Order
  • @`: Capturing
  • $< ($REAL_USER_ID): Special Variables in Alphabetical Order
  • $line: The while and until statements
  • $- ($FORMAT_LINES_LEFT): Formats
  • • Footers
    • Special Variables in Alphabetical Order
  • $) ($EFFECTIVE_GROUP_ID): Special Variables in Alphabetical Order
  • • Special Variables in Alphabetical Order
  • $( ($REAL_GROUP_ID): Special Variables in Alphabetical Order
  • $% ($FORMAT_PAGE_NUMBER): Format Variables
  • • Special Variables in Alphabetical Order
  • @+: Capturing
  • $? ($CHILD_ERROR): Special Variables in Alphabetical Order
  • • backtick operator and: Command Input (Backtick) Operator
    • close function and: close
  • $> ($EFFECTIVE_USER_ID): Special Variables in Alphabetical Order
  • $[semi] ($SUBSCRIPT_SEPARATOR): Special Variables in Alphabetical Order
  • $#
  • • obsolete variable for numeric output: Special Variables in Alphabetical Order
  • $&: Pattern-Matching Operators
  • $`: Pattern-Matching Operators
  • ${^ (internal variable names): Names
  • $^W: Controlling Warnings
  • $; (SUBSCRIPT_SEPARATOR): Hashes
  • $': Pattern-Matching Operators
  • $/ ($INPUT_RECORD_SEPARATOR): Switches
  • • Special Variables in Alphabetical Order
  • $~ ($FORMAT_NAME): Format Variables
  • • Special Variables in Alphabetical Order
  • $_ ($ARG) ;glob function with: Filename Globbing Operator
  • $_ variable: Regular Expressions
  • • Quantifiers
  • $| ($OUTPUT_AUTOFLUSH): Format Variables
  • • Special Variables in Alphabetical Order
  • ${^WIDE_SYSTEM_CALLS}: Building Character
  • • Special Variables in Alphabetical Order
• . (dot) ;concatenation operator: Time Efficiency
• =; (equal sign)
• • =;> (corresponds to) operator: Comma Operators
• > (right angle bracket)
• • in debugger commands: Actions and Command Execution
  • for filename globbing: Filename Globbing Operator
  • in filenames: open
  • greater than operator: Relational Operators
  • > (greater than) operator: Filehandles
  • for line input operator (see angle operator)
  • for right justification: Format Variables
  • >= (greater than or equal) operator: Relational Operators
  • >> (right-shift) operator: Shift Operators
  • >>= (assignment) operator: Assignment Operators
• < (left angle bracket)
• • for left justification: Format Variables
  • in debugger commands: Actions and Command Execution
  • for filename globbing: Filename Globbing Operator
  • in filenames: open
  • <=> (comparison) operator: Some Numeric and String Comparison Operators
  • • sort
  • << for here documents: "Here" Documents
  • <<= (assignment) operator: Assignment Operators
  • less than operator: Relational Operators
  • <= (less than or equal) operator: Some Numeric and String Comparison Operators
  • • Relational Operators
  • for line input: Line Input (Angle) Operator
• || (OR logical operator): Logical Operators
• () (parentheses);grouping operator: The Little Engine That /Could(n't)?/
• % (percent sign): Named Unary and File Test Operators
• • for checksums: unpack
  • for hash names: Hashes.
  • • Variables
  • modulus operator: Multiplicative Operators
  • %= (modulus assignment) operator: Assignment Operators
  • prototype character: Prototypes
  • signifying variable type: Variable Syntax
• | (pipe symbol)
• • for pattern alternation: Alternation
• + (plus) ;unary operator: Ideographic Unary Operators
• ?(question mark): Named Unary and File Test Operators
• " (double quotes): String Literals
• • Pattern-Matching Operators
  • Pattern-Matching Operators
  • Braces, Brackets, and Quoting
  • conversion operator, stringification: Overloadable Operators
  • in formline arguments: formline
  • in replacement string: The s/// Operator (Substitution)
  • translation escape processing: When backslashes happen
• ; (semicolon)
• • in filenames, security risks of: Cleaning Up Your Environment
  • Perl statements, terminating with: Molecules
  • simple statements, ending in: Simple Statements
• / (slash): Named Unary and File Test Operators
• • debugger command: Locating Code
  • delimiters, replacing as: Pick Your Own Quotes
  • division operator: Multiplicative Operators
  • root directory: chroot
  • /=; (assignment) operator: Assignment Operators
  • // (see m// operator)
• { } (braces)
• • hash key, enclosing in: Hashes.
• ~ (tilde)
• • bitwise negation operator: Ideographic Unary Operators
  • to suppress blank lines: Formats
• _(underscore)
• • global filehandle: Special Variables in Alphabetical Order
• | (vertical bar)
• • for alternation: The Regular Expression Bestiary
  • bitwise or operator: Bitwise Operators
  • for centering: Format Variables
  • debugger command: Actions and Command Execution
  • ...|... alternation: Metasymbol Tables
  • in filenames: open
  • -| piping pseudocommand: Talking to Yourself
  • metacharacter: The Regular Expression Bestiary
  • • Metacharacters and Metasymbols
  • || (logical or) operator: Letting Perl Do the Work
  • • Syntactic Snafus with Indirect Objects
  • |= (assignment) operator: Assignment Operators
  • |- piping pseudocommand: Talking to Yourself
  • || debugger command: Actions and Command Execution
  • ||= (assignment) operator: Assignment Operators
• 32-bit systems: Endianness and Number Width
• 0 but true: fcntl
• • -w exemption: fcntl
• -0 command-line switch: Command Processing
• 0+ (numification) operator: Overloadable Operators

Symbols | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z