Index: Symbols and Numbers

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Index: Symbols & Numbers

@+ array of ending positions: 28.2. Special Variables in Alphabetical Order

$!, portability of: 25.4. System Interaction

& (ampersand): 3.10. Named Unary and File Test Operators

address-of operator (in C): 3.21. C Operators Missing from Perl

& (bitwise and) operator: 3.13. Bitwise Operators

&& (AND) operator: 3.14. C-Style Logical (Short-Circuit) Operators

&&= (assignment) operator: 3.17. Assignment Operators

in filenames: 29.2.104. open

Perl version 5, changes in use: 1.2.2. Verbs

prototype character: 6.4. Prototypes

for subroutine names: 1.2.1. Variable Syntax

2.5. Names
2.5. Names
4.6. goto
6.1. Syntax
omitting in prototypes: 6.4. Prototypes

* (asterisk): 3.10. Named Unary and File Test Operators

** (exponentiation)operator: 3.4. Exponentiation

**= (exponentiation assignment) operator: 3.17. Assignment Operators

*= (multiplication assignment) operator: 3.17. Assignment Operators

*? quantifier: 5.3.1. Metasymbol Tables

metacharacter: 5.1. The Regular Expression Bestiary

5.3. Metacharacters and Metasymbols

(multiplicative) operator: 3.1. Terms and List Operators (Leftward)

prototype character: 6.4. Prototypes

quantifier: 1.7.1. Quantifiers

5.3.1. Metasymbol Tables

in quantifiers: 5.5. Quantifiers

typeglob: 1.2.1. Variable Syntax

for typeglob names: 2.5. Names

2.10. Typeglobs and Filehandles

@ (at sign)

for array names: 1.2.1. Variable Syntax

2.4. Variables

@- array: 5.7.1. Capturing

@+ array of ending positions: 5.7.1. Capturing

@_ arrays: 6.2. Semantics

@_ array: 6.2. Semantics

28.2. Special Variables in Alphabetical Order

changes in use, Perl versions: 24.1.5. Previous Perl Traps

in debugger: 20.1. Using the Debugger

inside strings, escaping with backslash: 2.6.2. String Literals

in picture lines: 7. Formats

prototype character: 6.4. Prototypes

(backslash)

... metasymbol: 5.3.1. Metasymbol Tables

entering continued commands in debugger: 20.2. Debugger Commands

to escape metacharacters: 5.1. The Regular Expression Bestiary

5.3. Metacharacters and Metasymbols

interpretation by regex parser: 5.9.2.1. When backslashes happen

metacharacter: 5.1. The Regular Expression Bestiary

for multiline commands: 20.1. Using the Debugger

Q notation for backslashing nonalphanumeric characters: 2.6.2. String Literals

quoted strings, avoiding overuse in: 2.6.3. Pick Your Own Quotes

quotemeta function for: 29.2.118. quotemeta

reference operator: 3.5. Ideographic Unary Operators

8.2.1. The Backslash Operator

(backslash)

double quotes, interpreting with: 1.2.1.1. Singularities

` (backtick) operator

shell programming, Perl vs.: 24.1.4. Shell Traps

! (bang)

! (logical negation) operator

overloading: 13.3. Overloadable Operators

!! debugger command: 20.2.6. Actions and Command Execution

!~ (binding) operator: 3.6. Binding Operators

using with pattern matching operators: 5.2. Pattern-Matching Operators

complemented character sets, using for: 5.4.3.4. Defining your own character properties

in debugger commands: 20.2.6. Actions and Command Execution

logical negation operator: 3.5. Ideographic Unary Operators

!= (not equal to) operator: 1.5.6. Some Numeric and String Comparison Operators

24.1.1. Universal Blunders

{} braces: 24.1.1. Universal Blunders

[] (brackets)

[ metacharacter: 5.1. The Regular Expression Bestiary

5.3. Metacharacters and Metasymbols

[...] character class: 5.3.1. Metasymbol Tables

character classes: 5.3.1. Metasymbol Tables

5.4.1. Custom Character Classes

to match characters: 5.9.4. The Little Engine That /Could(n't)?/

precedence of: 3.1. Terms and List Operators (Leftward)

^ (caret) ;line boundary: 5.6.1. Beginnings: The A and ^ Assertions

: (colon)

:: in module names, translating to system directory separators: 11.1. Using Modules

:: for package identifiers: 2.6.4. Or Leave the Quotes Out Entirely

10. Packages
24.1.5. Previous Perl Traps

:: in fully qualified names: 2.5. Names

, (comma)

delimiting list values: 2.8. List Values and Arrays

2.8. List Values and Arrays

error in print statements: 24.1.1. Universal Blunders

key/value pairs and: 1.2.1.2.2. Hashes.

2.9. Hashes

large numbers and: 2.6.1. Numeric Literals

operator: 3.18. Comma Operators

3.18. Comma Operators
(see also => operator)
in scalar context: 24.1.5. Previous Perl Traps

as separator: 1.2.1.3. Complexities

$^T ($BASETIME): 3.10. Named Unary and File Test Operators

$. ($INPUT_LINE_NUMBER): 3.15. Range Operator

$ (dollar sign): 1.2.1.2.2. Hashes.

prototype character: 6.4. Prototypes

in debugger: 20.1. Using the Debugger

$# prefix: 2.8.2. Array Length

$$ (current process ID): 2.5. Names

$? (exit status, last child process): 2.5. Names

$ variables

$^O variable: 25. Portable Perl

line boundary: 5.6.2. Endings: The z, Z, and $ Assertions

in matching: 5.2.2. The m// Operator (Matching)

metacharacter: 5.1. The Regular Expression Bestiary

5.3. Metacharacters and Metasymbols

for scalar variable names: 1.2.1.2.1. Arrays.

2.4. Variables

scalar variable interpolation and: 2.6.2. String Literals

signifying scalar variables: 1.2.1. Variable Syntax

word boundary: 1.7.3. Nailing Things Down

$! variable: 1.5.5. Logical Operators

$ variables

$0 ($PROGRAM_NAME): 28.2. Special Variables in Alphabetical Order

$a and $b (sort variables): 28.2. Special Variables in Alphabetical Order

@': 5.7.1. Capturing

@&: 5.7.1. Capturing

$' ($POSTMATCH): 24.2.1. Time Efficiency

28.2. Special Variables in Alphabetical Order

$*: 28.2. Special Variables in Alphabetical Order

$@ ($EVAL_ERROR): 28.2. Special Variables in Alphabetical Order

$ ($OUTPUT_RECORD_SEPARATOR): 28.2. Special Variables in Alphabetical Order

$` ($PREMATCH): 24.2.1. Time Efficiency

28.2. Special Variables in Alphabetical Order

$! ($OS_ERROR): 28.2. Special Variables in Alphabetical Order

${^WARNING_BITS}: 28.2. Special Variables in Alphabetical Order

$] ($PERL_VERSION): 28.2. Special Variables in Alphabetical Order

$^ ($FORMAT_TOP_NAME): 7.1. Format Variables

7.2. Footers
24.1.1. Universal Blunders
28.2. Special Variables in Alphabetical Order

$^A ($ACCUMULATOR): 7.2.1. Accessing Formatting Internals

28.2. Special Variables in Alphabetical Order
formline function output: 29.2.42. formline

$^C ($COMPILING): 28.2. Special Variables in Alphabetical Order

$^D ($DEBUGGING): 19.1.3. Switches

28.2. Special Variables in Alphabetical Order

$^E ($EXTENDED_OS_ERROR): 28.2. Special Variables in Alphabetical Order

$^F ($SYSTEM_FD_MAX): 28.2. Special Variables in Alphabetical Order

$^H: 28.2. Special Variables in Alphabetical Order

$^I ($INPLACE_EDIT): 28.2. Special Variables in Alphabetical Order

$^L ($FORMAT_LINEFEED): 7.1. Format Variables

$^M: 28.2. Special Variables in Alphabetical Order

$^O ($OSNAME): 28.2. Special Variables in Alphabetical Order

$^P ($PERLDB): 28.2. Special Variables in Alphabetical Order

$^S ($EXCEPTIONS_BEING_CAUGHT): 28.2. Special Variables in Alphabetical Order

$^T ($BASETIME): 28.2. Special Variables in Alphabetical Order

$^V ($PERL_VERSION): 28.2. Special Variables in Alphabetical Order

$^W ($WARNING): 28.2. Special Variables in Alphabetical Order

$^X ($EXECUTABLE_NAME): 28.2. Special Variables in Alphabetical Order

$: ($FORMAT_LINE_BREAK_CHARACTERS): 7. Formats

28.2. Special Variables in Alphabetical Order

$, ($LIST_SEPARATOR): 28.2. Special Variables in Alphabetical Order

$$ ($PROCESS_ID): 28.2. Special Variables in Alphabetical Order

$. ($INPUT_LINE_NUMBER): 28.2. Special Variables in Alphabetical Order

resetting with close function: 29.2.16. close

$= ($FORMAT_LINES_PER_PAGE): 7.1. Format Variables

28.2. Special Variables in Alphabetical Order

@`: 5.7.1. Capturing

$< ($REAL_USER_ID): 28.2. Special Variables in Alphabetical Order

$line: 1.6.2.1. The while and until statements

$- ($FORMAT_LINES_LEFT): 7. Formats

7.2. Footers
28.2. Special Variables in Alphabetical Order

$) ($EFFECTIVE_GROUP_ID): 28.2. Special Variables in Alphabetical Order

28.2. Special Variables in Alphabetical Order

$( ($REAL_GROUP_ID): 28.2. Special Variables in Alphabetical Order

$% ($FORMAT_PAGE_NUMBER): 7.1. Format Variables

28.2. Special Variables in Alphabetical Order

@+: 5.7.1. Capturing

$? ($CHILD_ERROR): 28.2. Special Variables in Alphabetical Order

backtick operator and: 2.11.1. Command Input (Backtick) Operator
close function and: 29.2.16. close

$> ($EFFECTIVE_USER_ID): 28.2. Special Variables in Alphabetical Order

$[semi] ($SUBSCRIPT_SEPARATOR): 28.2. Special Variables in Alphabetical Order

obsolete variable for numeric output: 28.2. Special Variables in Alphabetical Order

$&: 5.2. Pattern-Matching Operators

$`: 5.2. Pattern-Matching Operators

${^ (internal variable names): 2.5. Names

$^W: 4.9.1. Controlling Warnings

$; (SUBSCRIPT_SEPARATOR): 2.9. Hashes

$': 5.2. Pattern-Matching Operators

$/ ($INPUT_RECORD_SEPARATOR): 19.1.3. Switches

28.2. Special Variables in Alphabetical Order

$~ ($FORMAT_NAME): 7.1. Format Variables

28.2. Special Variables in Alphabetical Order

$_ ($ARG) ;glob function with: 2.11.3. Filename Globbing Operator

$_ variable: 1.7. Regular Expressions

1.7.1. Quantifiers

$| ($OUTPUT_AUTOFLUSH): 7.1. Format Variables

28.2. Special Variables in Alphabetical Order

${^WIDE_SYSTEM_CALLS}: 15.1. Building Character

28.2. Special Variables in Alphabetical Order

. (dot) ;concatenation operator: 24.2.1. Time Efficiency

=; (equal sign)

=;> (corresponds to) operator: 3.18. Comma Operators

> (right angle bracket)

in debugger commands: 20.2.6. Actions and Command Execution
for filename globbing: 2.11.3. Filename Globbing Operator
in filenames: 29.2.104. open
greater than operator: 3.11. Relational Operators
> (greater than) operator: 1.4. Filehandles
for line input operator (see angle operator)
for right justification: 7.1. Format Variables
>= (greater than or equal) operator: 3.11. Relational Operators
>> (right-shift) operator: 3.9. Shift Operators
>>= (assignment) operator: 3.17. Assignment Operators

< (left angle bracket)

for left justification: 7.1. Format Variables

in debugger commands: 20.2.6. Actions and Command Execution

for filename globbing: 2.11.3. Filename Globbing Operator

in filenames: 29.2.104. open

<=> (comparison) operator: 1.5.6. Some Numeric and String Comparison Operators

29.2.159. sort

<< for here documents: 2.6.6. "Here" Documents

<<= (assignment) operator: 3.17. Assignment Operators

less than operator: 3.11. Relational Operators

<= (less than or equal) operator: 1.5.6. Some Numeric and String Comparison Operators

3.11. Relational Operators

for line input: 2.11.2. Line Input (Angle) Operator

|| (OR logical operator): 1.5.5. Logical Operators

( ) (parentheses);grouping operator: 5.9.4. The Little Engine That /Could(n't)?/

% (percent sign): 3.10. Named Unary and File Test Operators

for checksums: 29.2.189. unpack

for hash names: 1.2.1.2.2. Hashes.

2.4. Variables

modulus operator: 3.7. Multiplicative Operators

%= (modulus assignment) operator: 3.17. Assignment Operators

prototype character: 6.4. Prototypes

signifying variable type: 1.2.1. Variable Syntax

| (pipe symbol)

for pattern alternation: 5.8. Alternation

+ (plus) ;unary operator: 3.5. Ideographic Unary Operators

?(question mark): 3.10. Named Unary and File Test Operators

" (double quotes): 2.6.2. String Literals

5.2. Pattern-Matching Operators
5.2. Pattern-Matching Operators
8.5. Braces, Brackets, and Quoting
conversion operator, stringification: 13.3. Overloadable Operators
in formline arguments: 29.2.42. formline
in replacement string: 5.2.3. The s/// Operator (Substitution)
translation escape processing: 5.9.2.1. When backslashes happen

; (semicolon)

in filenames, security risks of: 23.1.2. Cleaning Up Your Environment
Perl statements, terminating with: 2.2. Molecules
simple statements, ending in: 4.1. Simple Statements

/ (slash): 3.10. Named Unary and File Test Operators

debugger command: 20.2.5. Locating Code
delimiters, replacing as: 2.6.3. Pick Your Own Quotes
division operator: 3.7. Multiplicative Operators
root directory: 29.2.15. chroot
/=; (assignment) operator: 3.17. Assignment Operators
// (see m// operator)

{ } (braces)

hash key, enclosing in: 1.2.1.2.2. Hashes.

~ (tilde)

bitwise negation operator: 3.5. Ideographic Unary Operators
to suppress blank lines: 7. Formats

_(underscore)

global filehandle: 28.2. Special Variables in Alphabetical Order

| (vertical bar)

for alternation: 5.1. The Regular Expression Bestiary

bitwise or operator: 3.13. Bitwise Operators

for centering: 7.1. Format Variables

debugger command: 20.2.6. Actions and Command Execution

...|... alternation: 5.3.1. Metasymbol Tables

in filenames: 29.2.104. open

-| piping pseudocommand: 16.3.2. Talking to Yourself

metacharacter: 5.1. The Regular Expression Bestiary

5.3. Metacharacters and Metasymbols

|| (logical or) operator: 5.9.1. Letting Perl Do the Work

12.3.3. Syntactic Snafus with Indirect Objects

|= (assignment) operator: 3.17. Assignment Operators

|- piping pseudocommand: 16.3.2. Talking to Yourself

|| debugger command: 20.2.6. Actions and Command Execution

||= (assignment) operator: 3.17. Assignment Operators

32-bit systems: 25.2. Endianness and Number Width

0 but true: 29.2.37. fcntl

-w exemption: 29.2.37. fcntl

-0 command-line switch: 19.1. Command Processing

0+ (numification) operator: 13.3. Overloadable Operators

Symbols & Numbers | 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