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Index: Symbols and Numbers

-0 option (perl)

Perl Cookbook, 8.0. Introduction
Perl in a Nutshell, 3.2. Command-Line Options
Programming Perl, 6.1.2. Switches

"0 but not true"

Perl Cookbook, 10.10. Returning Failure
Perl Cookbook, 17.2. Writing a TCP Server

\007 (octal value) sequence : Perl in a Nutshell, 4.6.3. Escaped Sequences

0666, as permission : Learning Perl, 13.5. Modifying Permissions

"1 while" : Perl Cookbook, 1.7. Expanding and Compressing Tabs

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

Learning Perl, 7.3.2.3. Parentheses as memory
Learning Perl, 7.4.5. Special Read-Only Variables
Learning Perl on Win32 Systems, 7.3.2.3. Parentheses as memory
Learning Perl on Win32 Systems, 7.4.5. Special Read-Only Variables
Perl in a Nutshell, 4.6.7. Pattern Match Variables

"500 Server Error", fixing : Perl Cookbook, 19.3. Fixing a 500 Server Error

8.3 filename format : Learning Perl on Win32 Systems, 10.3. Using Pathnames and Filenames

& (ampersand) : Programming Perl, 2.5.10. Named Unary and File Test Operators

address-of operator (in C) : Programming Perl, 2.5.21. C Operators Missing from Perl

bitwise AND operator

Perl in a Nutshell, 4.5.10. Bitwise Operators
Programming Perl, 2.5.13. Bitwise Operators

calling subroutines : Perl in a Nutshell, 4.7.1. Calling Subroutines

in encoded URLs : Perl in a Nutshell, 9.2. URL Encoding

in filenames : Programming Perl, 3.2.102. open

prototype character

Perl in a Nutshell, 4.7.5. Prototypes
Programming Perl, 2.7.3. Prototypes

query strings and : Learning Perl, 19.2. Your CGI Program in Context

for subroutine names

Programming Perl, 2.3.1. Variables
Programming Perl, 2.7. Subroutines

&& (logical AND) operator

Perl Cookbook, 1.2. Establishing a Default Value
Learning Perl, 9.6. && and || as Control Structures
Perl in a Nutshell, 4.5.9. Logical Operators
Programming Perl, 2.5.14. C-style Logical (Short Circuit) Operators

&&= (assignment) operator

Perl in a Nutshell, 4.5.6. Assignment Operators
Programming Perl, 2.5.17. Assignment Operators

&= (assignment) operator

Perl in a Nutshell, 4.5.6. Assignment Operators
Programming Perl, 2.5.17. Assignment Operators

< > (angle brackets)

< access mode : Perl Cookbook, 7.0. Introduction

< (filename globbing) operator

Learning Perl, 12.2. Globbing
Programming Perl, 2.3.7.3. Filename globbing operator
Programming Perl, 3.2.102. open

< (format field character)

Learning Perl, 11.4.1. Text Fields
Perl in a Nutshell, 4.10. Formats

< for left justification

Learning Perl, 2.4.2. Operators for Strings
Programming Perl, 2.8.1. Format Variables

< (less than) operator

Learning Perl on Win32 Systems, 2.4.2. Operators for Strings
Perl in a Nutshell, 4.5.4.1. Relational operators
Programming Perl, 2.5.11. Relational Operators

< (line input) operator : Programming Perl, 2.3.7.2. Line input (angle) operator

< Perl debugger command

Perl in a Nutshell, Chapter 6, Reference: <
Programming Perl, 8.1.1. Debugger Commands

<< for here documents : Programming Perl, 2.3.2.6. "Here" documents

<< (left-shift) operator : Programming Perl, 2.5.9. Shift Operators

<< Perl debugger command : Perl in a Nutshell, Chapter 6, Reference: <<

<<= (assignment) operator

Perl in a Nutshell, 4.5.6. Assignment Operators
Programming Perl, 2.5.17. Assignment Operators

<> (angle, diamond, line-input) operator

Advanced Perl Programming, 3.1.2.1. When would you ever need to use local?

Perl Cookbook, 7.0. Introduction

Perl Cookbook, 7.7. Writing a Filter

Perl Cookbook, 8.0. Introduction

Perl Cookbook, 9.6. Globbing, or Getting a List of Filenames Matching a Pattern

Perl Cookbook, 17.0. Introduction

Learning Perl, 6.2. Input from the Diamond Operator

Learning Perl on Win32 Systems, 17.5. Variable-Length (Text) Databases

Perl in a Nutshell, 4.9. Filehandles

Programming Perl, 7.2.35.3. Non-option callback routine

examples of

Learning Perl, A.7. Chapter 8, Functions
Learning Perl, A.9. Chapter 10, Filehandles and File Tests
Learning Perl, A.14. Chapter 15, Other Data Transformation
Learning Perl, A.16. Chapter 17, User Database Manipulation
Learning Perl on Win32 Systems, A.7. Chapter 8, Functions
Learning Perl on Win32 Systems, A.9. Chapter 10, Filehandles and File Tests
Learning Perl on Win32 Systems, A.14. Chapter 15, Other Data Transformation
Learning Perl on Win32 Systems, A.16. Chapter 17, Database Manipulation
Learning Perl on Win32 Systems, 7.2. Simple Uses of Regular Expressions

<&= and <& open modes : Perl Cookbook, 7.19. Opening and Closing File Descriptors by Number

<= (less than or equal) operator

Learning Perl, 2.4.2. Operators for Strings
Perl in a Nutshell, 4.5.4.1. Relational operators
Programming Perl, 2.5.11. Relational Operators

<=> (comparison, spaceship) operator

Perl Cookbook, 4.14. Sorting an Array Numerically
Learning Perl, 15.4. Advanced Sorting
Perl in a Nutshell, 4.5.4.2. Equality operators
Programming Perl, 2.5.12. Equality Operators
Programming Perl, 3.2.153. sort
examples of : Learning Perl, A.16. Chapter 17, User Database Manipulation

<% %> delimiters : Perl in a Nutshell, 20.2. Server-Side PerlScript

<FH> operator : Programming Perl, 8.2.2. Frequently Ignored Advice

> access mode : Perl Cookbook, 7.0. Introduction

> (filename globbing) operator

Learning Perl, 12.2. Globbing
Programming Perl, 2.3.7.3. Filename globbing operator
Programming Perl, 3.2.102. open

> (format field character)

Learning Perl, 11.4.1. Text Fields
Perl in a Nutshell, 4.10. Formats

> (greater than) operator

Learning Perl, 2.4.2. Operators for Strings
Perl in a Nutshell, 4.5.4.1. Relational operators
Programming Perl, 2.5.11. Relational Operators

> (line input) operator : Programming Perl, 2.3.7.2. Line input (angle) operator

> (Perl debugger) command

Perl in a Nutshell, Chapter 6, Reference: >
Programming Perl, 8.1.1. Debugger Commands

> (for right justification) : Programming Perl, 2.8.1. Format Variables

>&, in open()

Perl Cookbook, 7.19. Opening and Closing File Descriptors by Number
Learning Perl, 14.5. Summary of Process Operations

>> access mode : Perl Cookbook, 7.0. Introduction

>> to open file for appending : Perl in a Nutshell, 4.9. Filehandles

>> Perl debugger command : Perl in a Nutshell, Chapter 6, Reference: >>

>> (right-shift) operator : Programming Perl, 2.5.9. Shift Operators

>>= (assignment) operator

Perl in a Nutshell, 4.5.6. Assignment Operators
Programming Perl, 2.5.17. Assignment Operators

>= (greater than or equal) operator

Learning Perl, 2.4.2. Operators for Strings
Perl in a Nutshell, 4.5.4.1. Relational operators
Programming Perl, 2.5.11. Relational Operators

* (asterisk) : Programming Perl, 2.5.10. Named Unary and File Test Operators

dereference operator (in C) : Programming Perl, 2.5.21. C Operators Missing from Perl

multiplication operator

Perl in a Nutshell, 4.5.3. Arithmetic Operators
Programming Perl, 2.5.7. Multiplicative Operators

in pack format string : Learning Perl, 16.2. Packing and Unpacking Binary Data

as prefix : Learning Perl, D.7. Symbol Table Manipulation with *FRED

prototype character

Perl in a Nutshell, 4.7.5. Prototypes
Programming Perl, 2.7.3. Prototypes

quantifier

Programming Perl, 1.7.1. Quantifiers
Programming Perl, 2.4.1.2. The rules of regular expression matching

regular expression metacharacter

Learning Perl, 7.3.2.2. Multipliers
Perl in a Nutshell, 4.6.2. Regular Expression Syntax

to store filehandles

Perl Cookbook, 7.0. Introduction
Perl Cookbook, 7.16. Storing Filehandles in Variables

for typeglob names

Programming Perl, 2.3.6. Typeglobs and Filehandles
Programming Perl, 2.7.1. Passing Symbol Table Entries (Typeglobs)

** (exponentiation) operator

Learning Perl, 2.4.1. Operators for Numbers
Perl in a Nutshell, 4.5.3. Arithmetic Operators
Programming Perl, 2.5.4. Exponentiation
Programming Perl, 8.2.3. Awk Traps

**= operator

Learning Perl, 2.6.1. Binary Assignment Operators
Perl in a Nutshell, 4.5.6. Assignment Operators
Programming Perl, 2.5.17. Assignment Operators

*= (assignment) operator

Perl in a Nutshell, 4.5.6. Assignment Operators
Programming Perl, 2.5.17. Assignment Operators

*? regular expression quantifier : Perl in a Nutshell, 4.6.6. Quantifiers

@ (at sign) : Programming Perl, 8.2.7. Previous Perl Traps

array name prefix

Learning Perl, 1.5.5. More than One Secret Word
Learning Perl on Win32 Systems, 1.6.5. More than One Secret Word
Perl in a Nutshell, 4.2.4.1. Arrays
Programming Perl, 2.3.1. Variables

in debugger : Programming Perl, 8.1.2. Using the Debugger

dereferencing with

Advanced Perl Programming, 1.1.4. References to Arrays
Perl in a Nutshell, 4.8.2. Dereferencing

format field delimiter

Learning Perl, 11.4.1. Text Fields
Perl in a Nutshell, 4.10. Formats

in picture lines : Programming Perl, 2.8. Formats

prefix for array variables : Learning Perl, 3.3. Variables

prototype character

Perl in a Nutshell, 4.7.5. Prototypes
Programming Perl, 2.7.3. Prototypes

@*, in formats : Learning Perl, 11.4.3. Multiline Fields

@_ array

Perl Cookbook, 10.1. Accessing Subroutine Arguments
Learning Perl, 1.5.9. Making It a Bit More Modular
Learning Perl, 8.4. Arguments
Learning Perl on Win32 Systems, 1.6.9. Making It a Bit More Modular
Learning Perl on Win32 Systems, 8.4. Arguments
Perl in a Nutshell, 4.7.2. Passing Arguments
Programming Perl, 2.7. Subroutines
Programming Perl, 7.2.13. English - Use English or awk Names for Punctuation Variables
Programming Perl, 8.1.7. Debugger Bugs

` (backquote)

Learning Perl, 1.5.12. Warning Someone When Things Go Astray

Programming Perl, 6.2.2.1. Anonymous pipes

as command invocation : Learning Perl, 14.2. Using Backquotes

emulating : Programming Perl, 6.3.1.2. Cleaning up your path

example of : Learning Perl, A.13. Chapter 14, Process Management

expanding : Perl Cookbook, 1.10. Interpolating Functions and Expressions Within Strings

operator

Perl Cookbook, 16.1. Gathering Output from a Program
Perl Cookbook, 19.6. Executing Commands Without Shell Escapes
Programming Perl, 2.3.7.1. Command input (backtick) operator
Programming Perl, 8.2.6. Shell Traps
Programming Perl, 8.4. Programming with Style

qx() : Perl Cookbook, 4.1. Specifying a List In Your Program

\ (backslash)

Learning Perl, 2.3.2. Double-Quoted Strings

Learning Perl on Win32 Systems, 10.3. Using Pathnames and Filenames

escapes

Perl Cookbook, 1.13. Escaping Characters
Learning Perl, 2.3.1. Single-Quoted Strings
Learning Perl on Win32 Systems, 2.3.2. Double-Quoted Strings
Programming Perl, 2.4.1.1. The regular expression bestiary

for multiline commands : Programming Perl, 8.1.2. Using the Debugger

operator

Perl Cookbook, 10.5. Passing Arrays and Hashes by Reference
Perl Cookbook, 11.5. Taking References to Scalars

in prototype declarations : Perl in a Nutshell, 4.7.5. Prototypes

quotemeta function for : Programming Perl, 3.2.114. quotemeta

reference creation operator

Perl in a Nutshell, 4.5.2. Unary Operators
Perl in a Nutshell, 4.8.1. Creating References
Programming Perl, 2.5.5. Ideographic Unary Operators
Programming Perl, 4.2.1. The Backslash Operator

in regular expressions

Learning Perl, 7.3.1. Single-Character Patterns
Learning Perl, 7.3.3. Anchoring Patterns
Learning Perl on Win32 Systems, 7.3.1. Single-Character Patterns
Perl in a Nutshell, 4.6.2. Regular Expression Syntax
as memory access : Learning Perl, 7.3.2.3. Parentheses as memory

static allocation : Advanced Perl Programming, 1.1. Referring to Existing Variables

in system() argument : Learning Perl, 14.1. Using system and exec

\1, \2, ... pattern match variables

Learning Perl, 7.3.2.3. Parentheses as memory
Learning Perl, 7.4.5. Special Read-Only Variables
Learning Perl on Win32 Systems, 7.3.2.3. Parentheses as memory
Learning Perl on Win32 Systems, 7.4.5. Special Read-Only Variables
Perl in a Nutshell, 4.6.7. Pattern Match Variables

\@ reference notation : Learning Perl, 19.7.1. References

! (bang)

for argument specifiers : Programming Perl, 7.2.35. Getopt::Long - Extended Processing of Command-Line Options

CPAN.pm eval command : Perl in a Nutshell, Chapter 2, Reference: !

example of : Learning Perl, A.13. Chapter 14, Process Management

in import list : Programming Perl, 7.2.15.1. Specialized import lists

logical negation operator

Learning Perl, 1.5.9. Making It a Bit More Modular
Learning Perl on Win32 Systems, 1.6.9. Making It a Bit More Modular
Perl in a Nutshell, 4.5.2. Unary Operators
Programming Perl, 2.5.5. Ideographic Unary Operators

.newsrc entries : Perl in a Nutshell, 15.3. The News::Newsrc Module

Perl debugger command

Perl in a Nutshell, Chapter 6, Reference: !
Programming Perl, 8.1.1. Debugger Commands

!! debugger command

Perl in a Nutshell, Chapter 6, Reference: !!
Programming Perl, 8.1.1. Debugger Commands

!= (not equal to) operator

Learning Perl, 2.4.2. Operators for Strings
Perl in a Nutshell, 4.5.4.2. Equality operators
Programming Perl, 2.5.12. Equality Operators
Programming Perl, 8.2.1. Universal Blunders

!~ (binding) operator : Programming Perl, 2.5.6. Binding Operators

!~ (pattern match) operator : Perl in a Nutshell, 4.5.7. Pattern Match Operators

{} (braces)

Advanced Perl Programming, 1.2.3. References to Anonymous Storage

Advanced Perl Programming, 1.2.5. A More General Rule

Programming Perl, 4.5. Braces, Brackets, and Quoting

Programming Perl, 8.2.1. Universal Blunders

Programming Perl, 8.4. Programming with Style

anonymous hashes : Advanced Perl Programming, 1.2.3. References to Anonymous Storage

in awk : Programming Perl, 8.2.3. Awk Traps

in double-quoted strings : Learning Perl, 2.6.4. Interpolation of Scalars into Strings

hash composer : Programming Perl, 4.2.3. The Anonymous Hash Composer

identifiers in : Programming Perl, 2.3.2.2. String literals

quantifier

Programming Perl, 1.7.1. Quantifiers
Programming Perl, 2.4.1.2. The rules of regular expression matching

in regular expressions

Learning Perl, 7.3.2.2. Multipliers
Perl in a Nutshell, 4.6.2. Regular Expression Syntax
Perl in a Nutshell, 4.6.6. Quantifiers

required in if statements : Learning Perl, 4.2. The if/unless Statement

statement blocks

Perl in a Nutshell, 4.3. Statements
Programming Perl, 2.6.2. Compound Statements

{ Perl debugger command : Perl in a Nutshell, Chapter 6, Reference: {

{{ Perl debugger command : Perl in a Nutshell, Chapter 6, Reference: {{

[] (brackets)

anonymous arrays : Advanced Perl Programming, 1.2.3. References to Anonymous Storage

array composer : Programming Perl, 4.2.2. The Anonymous Array Composer

Perl debugger command : Perl in a Nutshell, Chapter 6, Reference: =

reference notation : Learning Perl, 19.7.1. References

regular expression metacharacter

Perl in a Nutshell, 4.6.2. Regular Expression Syntax
Perl in a Nutshell, 4.6.4. Character Classes
Programming Perl, 2.4.1.2. The rules of regular expression matching

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

^ (caret)

in [...] construct : Perl in a Nutshell, 4.6.4. Character Classes

anchor in regular expressions

Learning Perl, 7.3.1. Single-Character Patterns
Learning Perl, 7.3.3. Anchoring Patterns
Learning Perl on Win32 Systems, 7.3.3. Anchoring Patterns
Perl in a Nutshell, 4.6.2. Regular Expression Syntax
Perl in a Nutshell, 4.6.5. Anchors

assertion : Programming Perl, 1.7.1. Quantifiers

bitwise XOR operator

Perl in a Nutshell, 4.5.10. Bitwise Operators
Programming Perl, 2.5.13. Bitwise Operators
Programming Perl, 2.5.20. Logical and, or, not, and xor
Programming Perl, 8.2.3. Awk Traps
Programming Perl, 8.4. Programming with Style

filled field fieldholder

Learning Perl, 11.4.4. Filled Fields
Perl in a Nutshell, 4.10. Formats

grid geometry manager placeholder : Perl in a Nutshell, 18.2.2. The grid Geometry Manager

line boundary

Programming Perl, 1.7.3. Nailing Things Down
Programming Perl, 2.4.1.2. The rules of regular expression matching
Programming Perl, 2.4.1.3. The fine print

matching : Programming Perl, 2.4.1.2. The rules of regular expression matching

in picture lines : Programming Perl, 2.8. Formats

^= (assignment) operator

Perl in a Nutshell, 4.5.6. Assignment Operators
Programming Perl, 2.5.17. Assignment Operators

: (colon)

in import list : Programming Perl, 7.2.15.1. Specialized import lists

label suffix : Learning Perl on Win32 Systems, 9.4. Labeled Blocks

matching with split() : Learning Perl on Win32 Systems, 7.6.1. The split Function

.newsrc entries : Perl in a Nutshell, 15.3. The News::Newsrc Module

in package names : Perl in a Nutshell, 7.1. Namespaces and Packages

:: for package identifiers

Advanced Perl Programming, 6.6. Nesting Packages
Programming Perl, 5.1. Packages
Programming Perl, 8.2.7. Previous Perl Traps
for instance methods : Advanced Perl Programming, 7.2.4. The Need for Polymorphism

, (comma)

array literal character : Learning Perl on Win32 Systems, 3.2. Literal Representation

delimiting list values

Perl Cookbook, 4.2. Printing a List with Commas
Programming Perl, 2.3.4. List Values and Arrays

key/value pairs and : Programming Perl, 2.3.5. Hashes (Associative Arrays)

large numbers and : Programming Perl, 2.3.2.1. Numeric literals

number legibility without : Perl in a Nutshell, 4.2.1. Numbers

operator

(see also = (equal sign), => operator)
Learning Perl on Win32 Systems, D.4. Other Operators
Perl in a Nutshell, 4.5.11.3. Comma operator
Programming Perl, 2.5.18. Comma Operators
Programming Perl, 8.2.3. Awk Traps

$ (dollar sign)

in debugger : Programming Perl, 8.1.2. Using the Debugger

dereferencing scalars

Advanced Perl Programming, 1.1.3. References to Scalars
Perl in a Nutshell, 4.8.2. Dereferencing

line boundary

Programming Perl, 2.4.1.2. The rules of regular expression matching
Programming Perl, 2.4.1.3. The fine print

prototype character

Perl in a Nutshell, 4.7.5. Prototypes
Programming Perl, 2.7.3. Prototypes

regular expression anchor

Perl in a Nutshell, 4.6.2. Regular Expression Syntax
Perl in a Nutshell, 4.6.5. Anchors

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

scalar variable names

Learning Perl, 2.5. Scalar Variables
Perl in a Nutshell, 4.2.4. Variables
Programming Perl, 2.3.1. Variables

word boundary : Programming Perl, 1.7.3. Nailing Things Down

$ variables

$0 ($PROGRAM_NAME)

Perl in a Nutshell, 4.4.1. Global Special Variables
Programming Perl, 2.9.3. Global Special Variables
Programming Perl, 7.2.13. English - Use English or awk Names for Punctuation Variables

$1, $2, $3... : (see backreferences)

$& ($MATCH)

Learning Perl, 7.4.5. Special Read-Only Variables
Perl in a Nutshell, 4.4.5. Regular Expression Special Variables
Programming Perl, 2.4.1.3. The fine print
Programming Perl, 2.9.1. Regular Expression Special Variables
Programming Perl, 6.4.2.2. a2p
Programming Perl, 7.2.13. English - Use English or awk Names for Punctuation Variables
Programming Perl, 8.3.1. Time Efficiency

$< ($REAL_USER_ID)

Perl in a Nutshell, 4.4.1. Global Special Variables
Programming Perl, 2.9.3. Global Special Variables
Programming Perl, 7.2.13. English - Use English or awk Names for Punctuation Variables

$> ($EFFECTIVE_USER_ID)

Perl in a Nutshell, 4.4.1. Global Special Variables
Programming Perl, 2.9.3. Global Special Variables
Programming Perl, 7.2.13. English - Use English or awk Names for Punctuation Variables

$' ($POSTMATCH)

Perl Cookbook, 6.0. Introduction
Learning Perl, 7.4.5. Special Read-Only Variables
Perl in a Nutshell, 4.4.5. Regular Expression Special Variables
Programming Perl, 2.4.1.3. The fine print
Programming Perl, 2.9.1. Regular Expression Special Variables
Programming Perl, 6.4.2.2. a2p
Programming Perl, 7.2.13. English - Use English or awk Names for Punctuation Variables
Programming Perl, 8.3.1. Time Efficiency

$* ($MULTILINE_MATCHING) : Programming Perl, 2.9.1. Regular Expression Special Variables

$@ ($EVAL_ERROR)

Perl in a Nutshell, 4.4.1. Global Special Variables
Programming Perl, 2.9.3. Global Special Variables
Programming Perl, 7.2.13. English - Use English or awk Names for Punctuation Variables

$` ($PREMATCH)

Perl Cookbook, 6.0. Introduction
Learning Perl, 7.4.5. Special Read-Only Variables
Perl in a Nutshell, 4.4.5. Regular Expression Special Variables
Programming Perl, 2.4.1.3. The fine print
Programming Perl, 2.9.1. Regular Expression Special Variables
Programming Perl, 6.4.2.2. a2p
Programming Perl, 7.2.13. English - Use English or awk Names for Punctuation Variables
Programming Perl, 8.3.1. Time Efficiency

$\ ($OUTPUT_RECORD_SEPARATOR)

Perl in a Nutshell, 4.4.1. Global Special Variables
Programming Perl, 2.9.3. Global Special Variables
Programming Perl, 6.1.2. Switches
Programming Perl, 7.2.13. English - Use English or awk Names for Punctuation Variables

$! ($OS_ERROR)

Perl in a Nutshell, 4.4.1. Global Special Variables
Programming Perl, 2.9.3. Global Special Variables
Programming Perl, 7.2.13. English - Use English or awk Names for Punctuation Variables

$[

Perl in a Nutshell, 4.4.1. Global Special Variables
Programming Perl, 2.9.3. Global Special Variables

$] ($PERL_VERSION)

Perl in a Nutshell, 4.4.1. Global Special Variables
Programming Perl, 2.9.3. Global Special Variables
Programming Perl, 7.2.13. English - Use English or awk Names for Punctuation Variables

$^ ($FORMAT_TOP_NAME)

Learning Perl, 11.6.3. Changing the Top-of-Page Format Name
Perl in a Nutshell, 4.4.6. Filehandle Special Variables
Programming Perl, 2.8.1. Format Variables
Programming Perl, 2.9.2. Per-Filehandle Special Variables
Programming Perl, 7.2.13. English - Use English or awk Names for Punctuation Variables
Programming Perl, 8.2.1. Universal Blunders

$^A ($ACCUMULATOR)

Perl in a Nutshell, 4.4.1. Global Special Variables
Programming Perl, 2.8.3. Accessing Formatting Internals
Programming Perl, 2.9.3. Global Special Variables
Programming Perl, 7.2.13. English - Use English or awk Names for Punctuation Variables
formline function : Programming Perl, 3.2.42. formline

$^D ($DEBUGGING)

Perl in a Nutshell, 4.4.1. Global Special Variables
Programming Perl, 2.9.3. Global Special Variables
Programming Perl, 6.1.2. Switches
Programming Perl, 7.2.13. English - Use English or awk Names for Punctuation Variables

$^E variable : Perl in a Nutshell, 4.4.1. Global Special Variables

$^F ($SYSTEM_FD_MAX)

Perl in a Nutshell, 4.4.1. Global Special Variables
Programming Perl, 2.9.3. Global Special Variables
Programming Perl, 7.2.13. English - Use English or awk Names for Punctuation Variables

$^H

Perl in a Nutshell, 4.4.1. Global Special Variables
Programming Perl, 2.9.3. Global Special Variables

$^I ($INPLACE_EDIT)

Learning Perl, 17.5. Variable-Length (Text) Databases
Perl in a Nutshell, 4.4.1. Global Special Variables
Programming Perl, 2.9.3. Global Special Variables
Programming Perl, 7.2.13. English - Use English or awk Names for Punctuation Variables

$^L ($FORMAT_FORMFEED, $FORMAT_LINEFEED)

Perl in a Nutshell, 4.4.1. Global Special Variables
Programming Perl, 2.8.1. Format Variables
Programming Perl, 2.9.3. Global Special Variables
Programming Perl, 7.2.13. English - Use English or awk Names for Punctuation Variables

$^M variable : Perl in a Nutshell, 4.4.1. Global Special Variables

$^O ($OSNAME)

Perl in a Nutshell, 4.4.1. Global Special Variables
Programming Perl, 2.9.3. Global Special Variables
Programming Perl, 7.2.13. English - Use English or awk Names for Punctuation Variables

$^P ($PERLDB)

Perl in a Nutshell, 4.4.1. Global Special Variables
Programming Perl, 2.9.3. Global Special Variables
Programming Perl, 7.2.13. English - Use English or awk Names for Punctuation Variables

$^T ($BASETIME)

Learning Perl, 10.5. The -x File Tests
Learning Perl on Win32 Systems, 10.6. The -x File Tests
Perl in a Nutshell, 4.4.1. Global Special Variables
Programming Perl, 2.5.10. Named Unary and File Test Operators
Programming Perl, 2.9.3. Global Special Variables
Programming Perl, 7.2.13. English - Use English or awk Names for Punctuation Variables

$^W ($WARNING)

Perl Cookbook, 13.5. Using Classes as Structs
Perl in a Nutshell, 4.4.1. Global Special Variables
Programming Perl, 2.9.3. Global Special Variables
Programming Perl, 7.2.13. English - Use English or awk Names for Punctuation Variables

$^X ($EXECUTABLE_NAME)

Perl in a Nutshell, 4.4.1. Global Special Variables
Programming Perl, 2.9.3. Global Special Variables
Programming Perl, 7.2.13. English - Use English or awk Names for Punctuation Variables

$: ($FORMAT_LINE_BREAK _CHARACTERS)

Learning Perl, 11.4.4. Filled Fields
Perl in a Nutshell, 4.4.1. Global Special Variables
Programming Perl, 2.9.3. Global Special Variables
Programming Perl, 7.2.13. English - Use English or awk Names for Punctuation Variables

$, ($LIST_SEPARATOR, $OUTPUT_FIELD_SEPARATOR)

Perl in a Nutshell, 4.4.1. Global Special Variables
Programming Perl, 2.9.3. Global Special Variables
Programming Perl, 7.2.13. English - Use English or awk Names for Punctuation Variables

$$ ($PROCESS_ID)

Perl in a Nutshell, 4.4.1. Global Special Variables
Programming Perl, 2.9.3. Global Special Variables
Programming Perl, 7.2.13. English - Use English or awk Names for Punctuation Variables

$. ($INPUT_LINE_NUMBER)

Perl in a Nutshell, 4.4.1. Global Special Variables
Programming Perl, 2.9.3. Global Special Variables
Programming Perl, 7.2.13. English - Use English or awk Names for Punctuation Variables
resetting with close function : Programming Perl, 3.2.18. close

$= ($FORMAT_LINES_PER_PAGE)

Learning Perl, 11.6.5. Changing the Position on the Page
Perl in a Nutshell, 4.4.6. Filehandle Special Variables
Programming Perl, 2.8.1. Format Variables
Programming Perl, 2.9.2. Per-Filehandle Special Variables
Programming Perl, 7.2.13. English - Use English or awk Names for Punctuation Variables

$# ($OFMT)

Learning Perl, 3.4.2. Array Element Access
Perl in a Nutshell, 4.4.1. Global Special Variables
Programming Perl, 2.3.4. List Values and Arrays
Programming Perl, 2.9.3. Global Special Variables

$- ($FORMAT_LINES_LEFT)

Learning Perl, 11.6.5. Changing the Position on the Page
Perl in a Nutshell, 4.4.6. Filehandle Special Variables
Programming Perl, 2.9.2. Per-Filehandle Special Variables
Programming Perl, 7.2.13. English - Use English or awk Names for Punctuation Variables
interaction with $= variable : Learning Perl, 11.6.5. Changing the Position on the Page

$( ($REAL_GROUP_ID)

Perl in a Nutshell, 4.4.1. Global Special Variables
Programming Perl, 2.9.3. Global Special Variables
Programming Perl, 7.2.13. English - Use English or awk Names for Punctuation Variables

$) ($EFFECTIVE_GROUP_ID)

Perl in a Nutshell, 4.4.1. Global Special Variables
Programming Perl, 2.9.3. Global Special Variables
Programming Perl, 7.2.13. English - Use English or awk Names for Punctuation Variables

$% ($FORMAT_PAGE_NUMBER)

Learning Perl, 1.5.14. Listing the Secret Words
Learning Perl on Win32 Systems, 1.6.14. Listing the Secret Words
Perl in a Nutshell, 4.4.6. Filehandle Special Variables
Programming Perl, 2.8.1. Format Variables
Programming Perl, 2.9.2. Per-Filehandle Special Variables
Programming Perl, 7.2.13. English - Use English or awk Names for Punctuation Variables

$+ ($LAST_PAREN_MATCH)

Perl Cookbook, 6.0. Introduction
Perl in a Nutshell, 4.4.5. Regular Expression Special Variables
Programming Perl, 2.4.1.3. The fine print
Programming Perl, 2.9.1. Regular Expression Special Variables
Programming Perl, 7.2.13. English - Use English or awk Names for Punctuation Variables

$? ($CHILD_ERROR)

Perl in a Nutshell, 4.4.1. Global Special Variables
Programming Perl, 2.9.3. Global Special Variables
Programming Perl, 7.2.13. English - Use English or awk Names for Punctuation Variables
backtick operator and : Programming Perl, 2.3.7.1. Command input (backtick) operator
close function and : Programming Perl, 3.2.18. close

$" ($LIST_SEPARATOR)

Perl in a Nutshell, 4.4.1. Global Special Variables
Programming Perl, 7.2.13. English - Use English or awk Names for Punctuation Variables

$; ($SUBSCRIPT_SEPARATOR)

Perl Cookbook, 9.4. Recognizing Two Names for the Same File
Perl in a Nutshell, 4.4.1. Global Special Variables
Programming Perl, 2.9.3. Global Special Variables
Programming Perl, 7.2.13. English - Use English or awk Names for Punctuation Variables

$/ ($INPUT_RECORD_SEPARATOR)

Perl Cookbook, 8.0. Introduction
Learning Perl, 6.1. Input from STDIN
Learning Perl, 14.2. Using Backquotes
Learning Perl on Win32 Systems, 6.1. Input from STDIN
Perl in a Nutshell, 4.4.1. Global Special Variables
Programming Perl, 2.9.3. Global Special Variables
Programming Perl, 6.1.2. Switches
Programming Perl, 7.2.13. English - Use English or awk Names for Punctuation Variables

$~ ($FORMAT_NAME)

Learning Perl, 11.6.2. Changing the Format Name
Perl in a Nutshell, 4.4.6. Filehandle Special Variables
Programming Perl, 2.8.1. Format Variables
Programming Perl, 2.9.2. Per-Filehandle Special Variables
Programming Perl, 7.2.13. English - Use English or awk Names for Punctuation Variables

$_ ($ARG)

Perl in a Nutshell, 4.4.1. Global Special Variables

Programming Perl, 2.4.1.3. The fine print

Programming Perl, 2.9.3. Global Special Variables

Programming Perl, 7.2.13. English - Use English or awk Names for Punctuation Variables

accidental clobbering : Perl Cookbook, 4.4. Doing Something with Every Element in a List

angle operator and : Programming Perl, 2.3.7.2. Line input (angle) operator

file tests default : Learning Perl on Win32 Systems, 10.6. The -x File Tests

forearch statement and

Learning Perl, 4.5. The foreach Statement
Learning Perl on Win32 Systems, 4.6. The foreach Statement
Programming Perl, 2.6.4.3. Foreach loops

glob() : Programming Perl, 2.3.7.3. Filename globbing operator

grep() : Programming Perl, 3.2.72. grep

implicit assignment to when reading : Learning Perl, 6.1. Input from STDIN

map() : Programming Perl, 3.2.91. map

outlawing unauthorized use

Perl Cookbook, 1.18. Program: psgrep
Perl Cookbook, 13.15. Creating Magic Variables with tie

regular expression matching default : Learning Perl on Win32 Systems, 7.2. Simple Uses of Regular Expressions

selecting other than with =~ operator : Learning Perl, 7.4.1. Selecting a Different Target (the =~ Operator)

split() default : Learning Perl on Win32 Systems, 7.6.1. The split Function

stat(), lstat() : Learning Perl on Win32 Systems, 10.7. The stat Function

tr() default target : Learning Perl on Win32 Systems, 15.5. Transliteration

unlink() default : Learning Perl on Win32 Systems, 13.1. Removing a File

$_[0] : Learning Perl, 8.4. Arguments

$| ($OUTPUT_AUTOFLUSH)

Perl Cookbook, 7.0. Introduction
Perl Cookbook, 7.12. Flushing Output
Perl in a Nutshell, 4.4.6. Filehandle Special Variables
Programming Perl, 2.8.1. Format Variables
Programming Perl, 2.9.2. Per-Filehandle Special Variables
Programming Perl, 7.2.13. English - Use English or awk Names for Punctuation Variables

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

. (dot) : Programming Perl, 2.5.10. Named Unary and File Test Operators

concatenation operator

Perl in a Nutshell, 4.5.11.4. String operator
Programming Perl, 1.5.2. String Operators
Programming Perl, 2.5.8. Additive Operators
Programming Perl, 8.3.1. Time Efficiency

example of : Learning Perl, A.7. Chapter 8, Functions

in numbers : Perl Cookbook, 2.17. Putting Commas in Numbers

Perl debugger command

Perl in a Nutshell, Chapter 6, Reference: .
Programming Perl, 8.1.1. Debugger Commands

regular expression metacharacter

Learning Perl, 7.3.1. Single-Character Patterns
Perl in a Nutshell, 4.6.2. Regular Expression Syntax
Programming Perl, 1.7. Regular Expressions
Programming Perl, 2.4.1.2. The rules of regular expression matching
Programming Perl, 2.4.1.3. The fine print

self-name for directory

Learning Perl, A.11. Chapter 12, Directory Access
Learning Perl, 13.3.1. About Hard and Soft Links

.. (range) operator

Perl Cookbook, 6.8. Extracting a Range of Lines
Perl in a Nutshell, 4.5.11.1. Range operator
Programming Perl, 2.5.15. Range Operator

.. for parent directory : Learning Perl, 13.3.1. About Hard and Soft Links

.. list construction operator : Learning Perl, 3.2. Literal Representation

... (range) operator

Perl Cookbook, 6.8. Extracting a Range of Lines
Perl in a Nutshell, 4.5.11.1. Range operator

.= (assignment) operator

Learning Perl, 2.6.1. Binary Assignment Operators
Perl in a Nutshell, 4.5.6. Assignment Operators
Programming Perl, 2.5.17. Assignment Operators

" (double quotation marks)

Advanced Perl Programming, 5.3. Watch Your Quotes
Programming Perl, 2.3.2.2. String literals
Programming Perl, 2.4.1.1. The regular expression bestiary
in formline arguments : Programming Perl, 3.2.42. formline

= (equal sign)

array assignment operator : Learning Perl on Win32 Systems, 3.4.1. Assignment

assignment operator

Learning Perl on Win32 Systems, 2.6. Scalar Operators and Functions
Perl in a Nutshell, 4.2.4. Variables
Perl in a Nutshell, 4.5.6. Assignment Operators
Programming Perl, 1.5.3. Assignment Operators
Programming Perl, 2.5.17. Assignment Operators

copy constructor : Programming Perl, 7.2.48.6. Copy constructor

debugger command : Programming Perl, 8.1.1. Debugger Commands

for embedded documentation (pod)

Perl in a Nutshell, 4.1. Program Structure
Perl in a Nutshell, 4.11. Pod

in hash name/value pairs : Perl in a Nutshell, 4.2.4.2. Hashes

=> (corresponds to) operator

Perl Cookbook, 5.0. Introduction
Learning Perl, 19.7.2. Fancier Calling Sequences
Perl in a Nutshell, 4.2.4.2. Hashes
Perl in a Nutshell, 4.5.11.3. Comma operator
Programming Perl, 2.5.18. Comma Operators
with key/value pairs : Programming Perl, 2.3.5. Hashes (Associative Arrays)
with named parameters : Programming Perl, 2.3.5. Hashes (Associative Arrays)

=> operator (CGI) : Learning Perl on Win32 Systems, 18.4.5. Fancier Calling Sequences

== (equal to) operator

Learning Perl, 2.4.2. Operators for Strings
Perl in a Nutshell, 4.5.4.2. Equality operators
Programming Perl, 2.5.12. Equality Operators
Programming Perl, 8.2.1. Universal Blunders

=~ (binding) operator

Perl Cookbook, 1.1. Accessing Substrings

Learning Perl, 7.4.1. Selecting a Different Target (the =~ Operator)

Perl in a Nutshell, 4.5.7. Pattern Match Operators

Programming Perl, 2.5.6. Binding Operators

Programming Perl, 8.2.3. Awk Traps

examples of

Learning Perl, 1.5.8. Making It Fair for the Rest
Learning Perl on Win32 Systems, 1.6.8. Making It Fair for the Rest

substitution and : Learning Perl, 7.5. Substitutions

tr operator and : Learning Perl, 15.5. Transliteration

> (greater than sign) : (see < > (angle brackets))

# (hash mark)

for comments : Perl in a Nutshell, 4.1. Program Structure

format fieldholder : Perl in a Nutshell, 4.10. Formats

#! (shebang) line

Learning Perl, 1.4. Basic Concepts
Perl in a Nutshell, 3. The Perl Interpreter

- (hyphen)

Programming Perl, 2.4.1.2. The rules of regular expression matching

Programming Perl, 2.5.10. Named Unary and File Test Operators

in [...] construct : Perl in a Nutshell, 4.6.4. Character Classes

arithmetic negation operator

Perl in a Nutshell, 4.5.2. Unary Operators
Programming Perl, 2.5.5. Ideographic Unary Operators

grid geometry manager placeholder : Perl in a Nutshell, 18.2.2. The grid Geometry Manager

Perl debugger command

Perl in a Nutshell, Chapter 6, Reference: -
Programming Perl, 8.1.1. Debugger Commands

in regular expression ranges : Learning Perl, 7.3.1. Single-Character Patterns

subtractive operator : Programming Perl, 2.5.8. Additive Operators

-> (arrow) operator

Advanced Perl Programming, 1.1.7. Shortcuts with the Arrow Notation
Advanced Perl Programming, 1.3.2. Final Shortcut: Omit Arrows Between Subscripts
Perl Cookbook, 11.0. Introduction
Perl Cookbook, 13.0. Introduction
Perl in a Nutshell, 4.5.1. The Arrow Operator
Perl in a Nutshell, 7.4. Object Syntax
Programming Perl, 2.5.2. The Arrow Operator
Programming Perl, 4.3.3. Using the Arrow Operator
Programming Perl, 5.3.6. Method Invocation
Programming Perl, 5.5.1. Object-Oriented Scaling Tips
dereferencing with : Perl in a Nutshell, 4.8.2.1. Arrow dereferencing
indirect notation versus : Advanced Perl Programming, 7.2.5.1. Detour: The indirect notation
for instance methods : Advanced Perl Programming, 7.2.4. The Need for Polymorphism

-*- for Emacs : Programming Perl, 6.1.1. Command Processing

-= (assignment) operator

Learning Perl, 11.4.2. Numeric Fields
Perl in a Nutshell, 4.5.6. Assignment Operators
Programming Perl, 2.5.17. Assignment Operators

-- (autodecrement) operator

Learning Perl, 2.6.2. Autoincrement and Autodecrement
Perl in a Nutshell, 4.5.5. Autoincrement and Autodecrement
Programming Perl, 1.5.4. Autoincrement and Autodecrement Operators
Programming Perl, 2.5.3. Autoincrement and Autodecrement
Programming Perl, 7.2.48.3. Overloadable operations

-- switch, Perl

Perl in a Nutshell, 3.2. Command-Line Options
Programming Perl, 6.1.2. Switches

-| piping pseudo-command : Programming Perl, 6.2.2.2. Talking to yourself

< (left angle bracket) : (see < > (angle brackets))

() (parentheses)

anonymous arrays : Advanced Perl Programming, 1.2.3. References to Anonymous Storage

around function arguments : Perl in a Nutshell, 5. Function Reference

array literals and : Learning Perl on Win32 Systems, 3.2. Literal Representation

chdir() and : Learning Perl on Win32 Systems, 12.1. Moving Around the Directory Tree

forcing array context with : Learning Perl on Win32 Systems, 3.4.1. Assignment

in functions : Programming Perl, 3. Functions

grouping operator : Programming Perl, 2.4.1.2. The rules of regular expression matching

keys() and : Learning Perl on Win32 Systems, 5.4.1. The keys Function

for list values : Programming Perl, 2.3.4. List Values and Arrays

operator precedence and : Perl in a Nutshell, 4.5. Operators

print() and : Learning Perl on Win32 Systems, 6.3.1. Using print for Normal Output

in regular expressions

(see also backreferences)
Learning Perl on Win32 Systems, 7.3.4. Precedence
Learning Perl on Win32 Systems, 7.3.2.3. Parentheses as memory
Perl in a Nutshell, 4.6.2. Regular Expression Syntax
Programming Perl, 1.7.4. Backreferences
Programming Perl, 2.4.1.1. The regular expression bestiary
Programming Perl, 2.5. Operators
Programming Perl, 2.5.1. Terms and List Operators (Leftward)
Programming Perl, 8.4. Programming with Style

values() and : Learning Perl on Win32 Systems, 5.4.2. The values Function

(?!) assertion : Programming Perl, 2.4.1.4. Regular expression extensions

(?!...) assertion : Programming Perl, 2.4.1.2. The rules of regular expression matching

(?:) for grouping : Programming Perl, 2.4.1.4. Regular expression extensions

(?...) assertion

Perl in a Nutshell, 4.6.8. Extended Regular Expressions
Programming Perl, 2.4.1.2. The rules of regular expression matching

(?=) assertion : Programming Perl, 2.4.1.4. Regular expression extensions

(?#) for comments : Programming Perl, 2.4.1.4. Regular expression extensions

(?i) modifier : Programming Perl, 2.4.1.4. Regular expression extensions

% (percent sign) : Programming Perl, 2.5.10. Named Unary and File Test Operators

associative array prefix

Learning Perl, 1.5.6. Giving Each Person a Different Secret Word
Learning Perl, 5.2. Hash Variables
Learning Perl on Win32 Systems, 1.6.6. Giving Each Person a Different Secret Word
Learning Perl on Win32 Systems, 5.2. Hash Variables

for checksums : Programming Perl, 3.2.182. unpack

dereferencing with

Advanced Perl Programming, 1.1.5. References to Hashes
Perl in a Nutshell, 4.8.2. Dereferencing

for hash names

Perl Cookbook, 5.0. Introduction
Programming Perl, 2.3.1. Variables

modulus operator

Learning Perl on Win32 Systems, 2.4.1. Operators for Numbers
Perl in a Nutshell, 4.5.3. Arithmetic Operators
Programming Perl, 2.5.7. Multiplicative Operators

prototype character

Perl in a Nutshell, 4.7.5. Prototypes
Programming Perl, 2.7.3. Prototypes

signifying variable type : Perl in a Nutshell, 4.2.4.2. Hashes

%= (assignment) operator

Perl in a Nutshell, 4.5.6. Assignment Operators
Programming Perl, 2.5.17. Assignment Operators

+ (plus sign) : Programming Perl, 2.5.10. Named Unary and File Test Operators

additive operator : Programming Perl, 2.5.8. Additive Operators

in filenames : Programming Perl, 3.2.102. open

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

quantifier

Programming Perl, 1.7. Regular Expressions
Programming Perl, 2.4.1.2. The rules of regular expression matching

regular expression metacharacter

Learning Perl, 7.3.2.2. Multipliers
Perl in a Nutshell, 4.6.2. Regular Expression Syntax

unary operator

Perl in a Nutshell, 4.5.2. Unary Operators
Programming Perl, 2.5.5. Ideographic Unary Operators

+= (assignment) operator

Learning Perl, A.3. Chapter 4, Control Structures
Learning Perl, 2.6.1. Binary Assignment Operators
Learning Perl on Win32 Systems, A.3. Chapter 4, Control Structures
Learning Perl on Win32 Systems, 2.6.1. Binary Assignment Operators
Perl in a Nutshell, 4.5.6. Assignment Operators
Programming Perl, 2.5.17. Assignment Operators

++ (autoincrement) operator

Learning Perl, 2.6.2. Autoincrement and Autodecrement
Learning Perl, 14.1. Using system and exec
Learning Perl on Win32 Systems, 2.6.2. Autoincrement and Autodecrement
Learning Perl on Win32 Systems, 14.1. Using system and exec
Perl in a Nutshell, 4.5.5. Autoincrement and Autodecrement
Programming Perl, 1.5.4. Autoincrement and Autodecrement Operators
Programming Perl, 2.5.3. Autoincrement and Autodecrement
Programming Perl, 7.2.48.3. Overloadable operations

+? regular expression quantifier : Perl in a Nutshell, 4.6.6. Quantifiers

# (pound sign)

comment character

Learning Perl, 1.4. Basic Concepts
Learning Perl on Win32 Systems, 1.5. Basic Concepts

format field characters : Learning Perl, 11.4.2. Numeric Fields

? (question mark) : Programming Perl, 2.5.10. Named Unary and File Test Operators

debugger command : Programming Perl, 8.1.1. Debugger Commands

quantifier

Programming Perl, 1.7.1. Quantifiers
Programming Perl, 2.4.1.2. The rules of regular expression matching

regular expression metacharacter

Learning Perl, 7.3.2.2. Multipliers
Perl in a Nutshell, 4.6.2. Regular Expression Syntax

?: (conditional) operator

Learning Perl on Win32 Systems, 9.6. &&, ||, and ?: as Control Structures
Perl in a Nutshell, 4.5.11.2. Conditional operator
Programming Perl, 2.5.16. Conditional Operator

?...? operator : (see m?? (match) operator)

?...? Perl debugger command : Perl in a Nutshell, Chapter 6, Reference: ?pattern?

' (quotation marks, single)

Advanced Perl Programming, 5.3. Watch Your Quotes
Programming Perl, 2.3.2.2. String literals

" (quotation marks, double)

Advanced Perl Programming, 5.3. Watch Your Quotes
Programming Perl, 2.3.2.2. String literals
Programming Perl, 2.4.1.1. The regular expression bestiary
in formline arguments : Programming Perl, 3.2.42. formline

> (right angle bracket) : (see < > (angle brackets))

; (semicolon)

Programming Perl, 2.6.1. Simple Statements

Programming Perl, 8.2.1. Universal Blunders

ending Perl statements

Learning Perl, 1.5.1. The "Hello, World" Program
Perl in a Nutshell, 4.1. Program Structure

in prototype declarations : Perl in a Nutshell, 4.7.5. Prototypes

# (hash mark)

for comments : Programming Perl, 2.4. Pattern Matching

in formats : Programming Perl, 2.8. Formats

#! (shebang) notation

Learning Perl on Win32 Systems, 1.5. Basic Concepts
Programming Perl, 1.3.1. How to Do It
Programming Perl, 6.1.1. Command Processing
Programming Perl, 6.3.1.3. Security bugs

' (single quotation marks)

Advanced Perl Programming, 5.3. Watch Your Quotes
Programming Perl, 2.3.2.2. String literals

/ (slash) : Programming Perl, 2.5.10. Named Unary and File Test Operators

choosing alternate to, in substitution : Learning Perl, 7.5. Substitutions

debugger command : Programming Perl, 8.1.1. Debugger Commands

division operator

Perl in a Nutshell, 4.5.3. Arithmetic Operators
Programming Perl, 2.5.7. Multiplicative Operators

encoding in URLs : Perl in a Nutshell, 9.2. URL Encoding

in import list : Programming Perl, 7.2.15.1. Specialized import lists

regular expression delimiter

Learning Perl, 7.2. Simple Uses of Regular Expressions
Learning Perl, 7.4.3. Using a Different Delimiter
Learning Perl on Win32 Systems, 7.2. Simple Uses of Regular Expressions
Learning Perl on Win32 Systems, 7.4.3. Using a Different Delimiter

root directory

Perl Cookbook, 9.0. Introduction
Programming Perl, 3.2.17. chroot

/= (assignment) operator

Perl in a Nutshell, 4.5.6. Assignment Operators
Programming Perl, 2.5.17. Assignment Operators

// operator : (see match (m//) operator)

/.../ Perl debugger command : Perl in a Nutshell, Chapter 6, Reference: /pattern/

~ (tilde)

bitwise negation operator

Perl in a Nutshell, 4.5.2. Unary Operators
Programming Perl, 2.5.5. Ideographic Unary Operators

complement operator : Programming Perl, 8.2.3. Awk Traps

in filenames, expanding : Perl Cookbook, 7.3. Expanding Tildes in Filenames

in formats : Learning Perl, 11.4.4. Filled Fields

suppressing output whitespace

Perl in a Nutshell, 4.10. Formats
Programming Perl, 2.8. Formats

~~ to print strings in fields

Learning Perl on Win32 Systems, 11.4.4. Filled Fields
Perl in a Nutshell, 4.10. Formats

_ (underscore)

Perl Cookbook, 9.0. Introduction

Programming Perl, 2.3.1. Variables

Programming Perl, 8.2.7. Previous Perl Traps

filehandle

Perl in a Nutshell, 4.4.3. Global Special Filehandles
Programming Perl, 2.9.5. Global Special Filehandles

improving number legibility : Perl in a Nutshell, 4.2.1. Numbers

large numbers and : Programming Perl, 2.3.2.1. Numeric literals

in variable names

Learning Perl, 2.5. Scalar Variables
Programming Perl, 8.4. Programming with Style

| (vertical bar)

bitwise OR operator

Perl in a Nutshell, 4.5.10. Bitwise Operators
Programming Perl, 2.4.1.1. The regular expression bestiary
Programming Perl, 2.5.13. Bitwise Operators

as format field characters

Learning Perl, 11.4.1. Text Fields
Perl in a Nutshell, 4.10. Formats
Programming Perl, 2.8.1. Format Variables

open() and

Learning Perl, 1.5.12. Warning Someone When Things Go Astray
Learning Perl, 14.3. Using Processes as Filehandles
Learning Perl on Win32 Systems, 1.6.12. Warning Someone When Things Go Astray
Learning Perl on Win32 Systems, 14.3. Using Processes as Filehandles
Programming Perl, 3.2.102. open

for option speficiers : Programming Perl, 7.2.35.2. Aliases and abbreviations

Perl debugger command

Perl in a Nutshell, Chapter 6, Reference: |
Programming Perl, 8.1.1. Debugger Commands

regular expression metacharacter

Learning Perl, 7.3.2.4. Alternation
Perl in a Nutshell, 4.6.2. Regular Expression Syntax

|= (assignment) operator

Perl in a Nutshell, 4.5.6. Assignment Operators
Programming Perl, 2.5.17. Assignment Operators

|- piping pseudo-command : Programming Perl, 6.2.2.2. Talking to yourself

|| (logical OR) operator

Perl Cookbook, 1.2. Establishing a Default Value

Learning Perl, 1.5.9. Making It a Bit More Modular

Learning Perl on Win32 Systems, 1.6.9. Making It a Bit More Modular

Perl in a Nutshell, 4.5.9. Logical Operators

Programming Perl, 2.5.14. C-style Logical (Short Circuit) Operators

as control structure : Learning Perl, 9.6. && and || as Control Structures

die() and

Learning Perl, 10.3. A Slight Diversion: die
Learning Perl on Win32 Systems, 10.4. A Slight Diversion: die

examples of

Learning Perl, A.7. Chapter 8, Functions
Learning Perl, A.15. Chapter 16, System Database Access
Learning Perl, 15.4. Advanced Sorting
Learning Perl on Win32 Systems, A.7. Chapter 8, Functions
Learning Perl on Win32 Systems, 15.4. Advanced Sorting

|| Perl debugger command

Perl in a Nutshell, Chapter 6, Reference: ||
Programming Perl, 8.1.1. Debugger Commands

||= (assignment) operator

Perl Cookbook, 1.2. Establishing a Default Value
Perl in a Nutshell, 4.5.6. Assignment Operators
Programming Perl, 2.5.17. Assignment Operators

/o pattern match modifier

Perl Cookbook, 6.10. Speeding Up Interpolated Matches
Perl in a Nutshell, 4.6.1. Pattern-Matching Operators

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