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Index: Symbols and Numbers

and $1 variables
- Parentheses as memory
- Special Read-Only Variables
filename format : Using Pathnames and Filenames
&& operator as control structure : &&, ||, and ?: as Control Structures
**= operator : Binary Assignment Operators
* (asterisk)
- ** (exponentiation) operator : Operators for Numbers
- as prefix : Symbol Table Manipulation With *FRED
- in pack format string : Packing and Unpacking Binary Data
- in regular expressions : Multipliers
@ (at sign)
- @_ array
- - Making It a Bit More Modular
  - Arguments
- as array name prefix : More than One Secret Word
- as format field delimiter : Text Fields
- as prefix for array variables : Variables
at sign
- @*, in formats : Multiline Fields
` (backquotes) as command invocation : Using Backquotes
(backslash) : Using Pathnames and Filenames
- escape character : Single-Quoted Strings
- escapes : Double-Quoted Strings
- in regular expressions : Single-Character Patterns
! (bang)
- != operator : Operators for Strings
- logical not operator : Making It a Bit More Modular
[ (left bracket) in double-quoted strings : Variable Interpolation of Arrays
^ (caret)
- as anchor in regular expressions : Anchoring Patterns
- as filled-field in formats : Filled Fields
(colon)
- label suffix : Labeled Blocks
- matching with split( ) : The split Function
(comma)
- array literal character : Literal Representation
- operator : Other Operators
{} (curly braces)
- in double-quoted strings : Interpolation of Scalars into Strings
- in regular expressions : Multipliers
- required in if statements : The if/unless Statement
$ (dollar sign)
- $1 as regular expression memory access : Special Read-Only Variables
- $& (match string) : Special Read-Only Variables
- $` (before-match string) : Special Read-Only Variables
- $^ variable : Changing the Top-of-Page Format Name
- $^I variable : Variable-Length ( Text) Databases
- $^T variable : The -x File Tests
- $: variable : Filled Fields
- $= variable : Changing the Position on the Page
- $- variable : Changing the Position on the Page
- $% (special variable), example of : Listing the Secret Words
- $#fred (index of last element of @fred) : Array Element Access
- $' (after-match string) : Special Read-Only Variables
- $/ variable : Input from STDIN
- $~ variable : Changing the Format Name
- $_ variable
- - default for file tests : The -x File Tests
  - default for stat( ), lstat( ) : The stat Function
  - foreach statement and : The foreach Statement
  - implicit assignment to when reading : Input from STDIN
  - regular expression matching default : Simple Uses of Regular Expressions
  - selecting other than with =~ operator : Selecting a Different Target (the =~ Operator)
  - split( ) default : The split Function
  - tr( ) default target : Transliteration
  - unlink( ) default : Removing a File
- $a variable, as special in sort comparison routine : Advanced Sorting
- $b variable, as special in sort comparison routine : Advanced Sorting
- $_[0], distinct from $_ : Arguments
- removing significance in strings : Interpolation of Scalars into Strings
- scalar variable prefix : Scalar Variables
(dot)
- .. list construction operator : Literal Representation
- .= operator : Binary Assignment Operators
- in regular expressions : Single-Character Patterns
= (equal sign)
- == operator : Operators for Strings
- => operator (CGI) : Fancier Calling Sequences
- =~ operator : Selecting a Different Target (the =~ Operator)
- - substitution and : Substitutions
- array assignment operator : Assignment
- assignment operator : Scalar Operators and Functions
=~ operator
- example of : Making It Fair for the Rest
- tr( ) and : Transliteration
> (greater than)
- >= (greater than or equal to) operator : Operators for Strings
- greater than operator : Operators for Strings
- (hyphen)
- -= operator : Numeric Fields
- -- operator : Autoincrement and Autodecrement
- in regular expression ranges : Single-Character Patterns
< (less than)
- <=> : (see spaceship (<=>) operator)
- <> : (see diamond operator)
- <= (less than or equal to) operator : Operators for Strings
- format field character : Text Fields
- less than operator : Operators for Strings
( ) (parentheses)
- array literals and : Literal Representation
- as memory in regular expressions : Precedence
- chdir( ) and : Moving Around the Directory Tree
- forcing array context with : Assignment
- keys( ) and : The keys Function
- memory in regular expressions : Parentheses as memory
- print( ) and : Using print for Normal Output
- in regular expressions : Precedence
- values( ) and : The values Function
% (percent sign)
- associative array prefix
- - Giving Each Person a Different Secret Word
  - Hash Variables
- modulus operator : Operators for Numbers
+ (plus sign)
- += operator
- - Control Structures
  - Binary Assignment Operators
- ++ operator
- - Autoincrement and Autodecrement
  - Using system and exec
- open( ) and : Fixed-Length Random-Access Databases
- in regular expressions : Multipliers
# (pound sign)
- comment character : Basic Concepts
- format field characters : Numeric Fields
? (question mark) in regular expressions : Multipliers
?: operator, as control structure : &&, ||, and ?: as Control Structures
#!/usr/bin/perl line : Basic Concepts
/ (slash)
- changing regular expressions : Using a Different Delimiter
- choosing alternate to, in substitution : Substitutions
- regular expression delimiter : Simple Uses of Regular Expressions
~ (tilde) in formats : Filled Fields
| (vertical bar), open( ) and
- Warning Someone When Things Go Astray
- Using Processes as Filehandles
| (vertical bar)
- format field characters : Text Fields
- in regular expressions : Alternation
|| (logical-or) operator
- as control structure : &&, ||, and ?: as Control Structures
- die( ) and : Slight Diversion: die
- example of
- - Functions
  - Advanced Sorting
- introduced : Making It a Bit More Modular

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