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Index: Symbols and Numbers

0666, as permission : 13.5. Modifying Permissions

\1, \2, ... in regular expressions

7.3.2.3. Parentheses as memory
7.4.5. Special Read-Only Variables

& (ampersand)

&& operator : 9.6. && and || as Control Structures
query strings and : 19.2. Your CGI Program in Context

* (asterisk)

**= operator : 2.6.1. Binary Assignment Operators
** (exponentiation) operator : 2.4.1. Operators for Numbers
in pack format string : 16.2. Packing and Unpacking Binary Data
as prefix : D.7. Symbol Table Manipulation with *FRED
in regular expressions : 7.3.2.2. Multipliers

@ (at sign)

@*, in formats : 11.4.3. Multiline Fields

@_ (subroutine arglist)

1.5.9. Making It a Bit More Modular
8.4. Arguments

as array name prefix : 1.5.5. More than One Secret Word

as format field delimiter : 11.4.1. Text Fields

as prefix for array variables : 3.3. Variables

` (backquotes) : 1.5.12. Warning Someone When Things Go Astray

as command invocation : 14.2. Using Backquotes
example of : A.13. Chapter 14, Process Management

\ (backslash) : 2.3.2. Double-Quoted Strings

\@ reference notation : 19.7.1. References

escapes : 2.3.1. Single-Quoted Strings

in system( ) argument : 14.1. Using system and exec

in regular expressions

7.3.1. Single-Character Patterns
7.3.3. Anchoring Patterns
as memory access : 7.3.2.3. Parentheses as memory

! operator

example of : A.13. Chapter 14, Process Management
as logical-not operator : 1.5.9. Making It a Bit More Modular
!= operator : 2.4.2. Operators for Strings

[ (left bracket) in double-quoted strings : 3.7. Variable Interpolation of Arrays

[ ] (brackets) reference notation : 19.7.1. References

^ (caret)

as anchor in regular expressions : 7.3.3. Anchoring Patterns
as filled-field in formats : 11.4.4. Filled Fields
in regular expressions : 7.3.1. Single-Character Patterns

{} (curly braces)

in double-quoted strings : 2.6.4. Interpolation of Scalars into Strings
in regular expressions : 7.3.2.2. Multipliers
required in if statements : 4.2. The if/unless Statement

$ (dollar sign)

$1, $2,... backreferences : 7.4.5. Special Read-Only Variables

$a, $b, ..., sorting with : 15.4. Advanced Sorting

$& (match string) : 7.4.5. Special Read-Only Variables

$` (before-match string) : 7.4.5. Special Read-Only Variables

$^ variable : 11.6.3. Changing the Top-of-Page Format Name

$^I variable : 17.5. Variable-Length ( Text) Databases

$^T variable : 10.5. The -x File Tests

$: variable : 11.4.4. Filled Fields

$= variable : 11.6.5. Changing the Position on the Page

$# for arrays : 3.4.2. Array Element Access

$- variable : 11.6.5. Changing the Position on the Page

interaction with $= variable : 11.6.5. Changing the Position on the Page

$% (special variable), example of : 1.5.14. Listing the Secret Words

$' (after-match string) : 7.4.5. Special Read-Only Variables

$/ variable

6.1. Input from STDIN
14.2. Using Backquotes

$~ variable : 11.6.2. Changing the Format Name

$_

foreach statement and : 4.5. The foreach Statement
implicit assignment to : 6.1. Input from STDIN
selecting other with =~ operator : 7.4.1. Selecting a Different Target (the =~ Operator)

$_[0] : 8.4. Arguments

removing significance in strings : 2.6.4. Interpolation of Scalars into Strings

as scalar variable prefix : 2.5. Scalar Variables

. (dot)

.. for parent directory : 13.3.1. About Hard and Soft Links
.. list construction operator : 3.2. Literal Representation
.= operator : 2.6.1. Binary Assignment Operators
as current directory : A.11. Chapter 12, Directory Access
example of : A.7. Chapter 8, Functions
in regular expressions : 7.3.1. Single-Character Patterns
as self-name for directory : 13.3.1. About Hard and Soft Links

= (equal sign)

== operator : 2.4.2. Operators for Strings

=> operator : 19.7.2. Fancier Calling Sequences

=~ operator : 7.4.1. Selecting a Different Target (the =~ Operator)

example of : 1.5.8. Making It Fair for the Rest
substitution and : 7.5. Substitutions
tr operator and : 15.5. Transliteration

> (greater than) : 2.4.2. Operators for Strings

>&, in open( ) : 14.5. Summary of Process Operations
>= operator : 2.4.2. Operators for Strings

#!/usr/bin/perl line : 1.4. Basic Concepts

- (hyphen)

-= operator : 11.4.2. Numeric Fields
-- operator : 2.6.2. Autoincrement and Autodecrement
in regular expression ranges : 7.3.1. Single-Character Patterns

< (less than) : 2.4.2. Operators for Strings

< and > as globbing delimiters : 12.2. Globbing
<= operator : 2.4.2. Operators for Strings
<=> : (see spaceship (<=>) operator)
format field characters : 11.4.1. Text Fields
<\> : (see diamond operator)

% (percent sign) as associative array prefix

1.5.6. Giving Each Person a Different Secret Word
5.2. Hash Variables

+ (plus sign) in regular expressions : 7.3.2.2. Multipliers

+ (plus)

modifying open( ) : 17.4. Fixed-Length Random Access Databases

+= operator

A.3. Chapter 4, Control Structures
2.6.1. Binary Assignment Operators

++ operator

2.6.2. Autoincrement and Autodecrement
14.1. Using system and exec

# (pound sign)

as comment character : 1.4. Basic Concepts
as format field characters : 11.4.2. Numeric Fields

? (question mark) in regular expressions : 7.3.2.2. Multipliers

; (semicolon) as statement terminator : 1.5.1. The "Hello, World" Program

/ (slash)

changing regular expressions and : 7.4.3. Using a Different Delimiter
choosing alternate to, in substitution : 7.5. Substitutions
regular expression delimiter : 7.2. Simple Uses of Regular Expressions

~ (tilde) in formats : 11.4.4. Filled Fields

_ (underscore) in variable names : 2.5. Scalar Variables

| (vertical bar)

as format field characters : 11.4.1. Text Fields

open( ) and

1.5.12. Warning Someone When Things Go Astray
14.3. Using Processes as Filehandles

in regular expressions : 7.3.2.4. Alternation

|| (logical-or) operator : 1.5.9. Making It a Bit More Modular

as control structure : 9.6. && and || as Control Structures

die( ) and : 10.3. A Slight Diversion: die

example of

A.7. Chapter 8, Functions
A.15. Chapter 16, System Database Access
15.4. Advanced Sorting

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