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Index: Symbols and Numbers

-0 switch, perl : 6.1.2. Switches

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

&& (AND) operator : 2.5.14. C-style Logical (Short Circuit) Operators

&&= (assignment) operator : 2.5.17. Assignment Operators

&= (assignment) operator : 2.5.17. Assignment Operators

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

bitwise AND operator : 2.5.13. Bitwise Operators

in filenames : 3.2.102. open

prototype character : 2.7.3. Prototypes

for subroutine names

2.3.1. Variables
2.7. Subroutines

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

** (exponentiation) operator : 2.5.4. Exponentiation

**= (assignment) operator : 2.5.17. Assignment Operators

*= (assignment) operator : 2.5.17. Assignment Operators

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

for typeglob names : 2.7.1. Passing Symbol Table Entries (Typeglobs)

multiplicative operator : 2.5.7. Multiplicative Operators

prototype character : 2.7.3. Prototypes

quantifier

1.7.1. Quantifiers
2.4.1.2. The rules of regular expression matching

for typeglob names : 2.3.6. Typeglobs and Filehandles

@ (at sign) : 8.2.7. Previous Perl Traps

@_ array

2.7. Subroutines
7.2.13. English - Use English or awk Names for Punctuation Variables
8.1.7. Debugger Bugs

for array names : 2.3.1. Variables

in debugger : 8.1.2. Using the Debugger

in picture lines : 2.8. Formats

prototype character : 2.7.3. Prototypes

\ (backslash)

to escape metacharacters : 2.4.1.1. The regular expression bestiary

for multiline commands : 8.1.2. Using the Debugger

quotemeta function for : 3.2.114. quotemeta

reference operator

2.5.5. Ideographic Unary Operators
4.2.1. The Backslash Operator

` (backtick) : 6.2.2.1. Anonymous pipes

emulating : 6.3.1.2. Cleaning up your path

operator

2.3.7.1. Command input (backtick) operator
8.2.6. Shell Traps
8.4. Programming with Style

! (bang)

!! debugger command : 8.1.1. Debugger Commands

!= (not equal to) operator

2.5.12. Equality Operators
8.2.1. Universal Blunders

!~ (binding) operator : 2.5.6. Binding Operators

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

debugger command : 8.1.1. Debugger Commands

in import list : 7.2.15.1. Specialized import lists

logical negation operator : 2.5.5. Ideographic Unary Operators

{} (braces)

4.5. Braces, Brackets, and Quoting

8.2.1. Universal Blunders

8.4. Programming with Style

in awk : 8.2.3. Awk Traps

for statement blocks : 2.6.2. Compound Statements

hash composer : 4.2.3. The Anonymous Hash Composer

identifiers in : 2.3.2.2. String literals

quantifier

1.7.1. Quantifiers
2.4.1.2. The rules of regular expression matching

[] (brackets)

array composer : 4.2.2. The Anonymous Array Composer
to match characters : 2.4.1.2. The rules of regular expression matching

^ (caret)

^= (assignment) operator : 2.5.17. Assignment Operators

assertion : 1.7.1. Quantifiers

bitwise XOR operator

2.5.13. Bitwise Operators
8.2.3. Awk Traps

line boundary

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

matching : 2.4.1.2. The rules of regular expression matching

in picture lines : 2.8. Formats

: (colon)

:: for package identifiers

5.1. Packages
8.2.7. Previous Perl Traps

in import list : 7.2.15.1. Specialized import lists

, (comma) : 8.2.1. Universal Blunders

delimiting list values : 2.3.4. List Values and Arrays

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

large numbers and : 2.3.2.1. Numeric literals

operator

(see also = (equal sign), => operator)
2.5.18. Comma Operators
8.2.3. Awk Traps

$ (dollar sign)

$# prefix : 2.3.4. List Values and Arrays

for backreferences : (see backreferences)

in debugger : 8.1.2. Using the Debugger

line boundary

2.4.1.2. The rules of regular expression matching
2.4.1.3. The fine print

prototype character : 2.7.3. Prototypes

for scalar variable names : 2.3.1. Variables

word boundary : 1.7.3. Nailing Things Down

$ variables

$^ ($FORMAT_TOP_NAME) : 8.2.1. Universal Blunders

$0 ($PROGRAM_NAME)

2.9.3. Global Special Variables
7.2.13. English - Use English or awk Names for Punctuation Variables

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

$& ($MATCH)

2.4.1.3. The fine print
2.9.1. Regular Expression Special Variables
6.4.2.2. a2p
7.2.13. English - Use English or awk Names for Punctuation Variables
8.3.1. Time Efficiency

$' ($POSTMATCH)

2.4.1.3. The fine print
2.9.1. Regular Expression Special Variables
6.4.2.2. a2p
7.2.13. English - Use English or awk Names for Punctuation Variables
8.3.1. Time Efficiency

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

$@ ($EVAL_ERROR)

2.9.3. Global Special Variables
7.2.13. English - Use English or awk Names for Punctuation Variables

$\ ($OUPUT_RECORD_SEPARATOR) : 6.1.2. Switches

$\ ($OUTPUT_RECORD_SEPARATOR)

2.9.3. Global Special Variables
7.2.13. English - Use English or awk Names for Punctuation Variables

$` ($PREMATCH)

2.4.1.3. The fine print
2.9.1. Regular Expression Special Variables
6.4.2.2. a2p
7.2.13. English - Use English or awk Names for Punctuation Variables
8.3.1. Time Efficiency

$! ($OS_ERROR)

2.9.3. Global Special Variables
7.2.13. English - Use English or awk Names for Punctuation Variables

$[ : 2.9.3. Global Special Variables

$] ($PERL_VERSION)

2.9.3. Global Special Variables
7.2.13. English - Use English or awk Names for Punctuation Variables

$^ ($FORMAT_TOP_NAME)

2.8.1. Format Variables
2.9.2. Per-Filehandle Special Variables
7.2.13. English - Use English or awk Names for Punctuation Variables

$^A ($ACCUMULATOR)

2.8.3. Accessing Formatting Internals
2.9.3. Global Special Variables
7.2.13. English - Use English or awk Names for Punctuation Variables
formline function : 3.2.42. formline

$^D ($DEBUGGING)

2.9.3. Global Special Variables
6.1.2. Switches
7.2.13. English - Use English or awk Names for Punctuation Variables

$^F ($SYSTEM_FD_MAX)

2.9.3. Global Special Variables
7.2.13. English - Use English or awk Names for Punctuation Variables

$^H : 2.9.3. Global Special Variables

$^I ($INPLACE_EDIT)

2.9.3. Global Special Variables
7.2.13. English - Use English or awk Names for Punctuation Variables

$^L ($FORMAT_FORMFEED) : 2.9.3. Global Special Variables

$^L ($FORMAT_LINEFEED)

2.8.1. Format Variables
7.2.13. English - Use English or awk Names for Punctuation Variables

$^O ($OSNAME)

2.9.3. Global Special Variables
7.2.13. English - Use English or awk Names for Punctuation Variables

$^P ($PERLDB)

2.9.3. Global Special Variables
7.2.13. English - Use English or awk Names for Punctuation Variables

$^ ($BASETIME) : 2.9.3. Global Special Variables

$^T ($BASETIME)

2.5.10. Named Unary and File Test Operators
7.2.13. English - Use English or awk Names for Punctuation Variables

$^W ($WARNING)

2.9.3. Global Special Variables
7.2.13. English - Use English or awk Names for Punctuation Variables

$^X ($EXECUTABLE_NAME)

2.9.3. Global Special Variables
7.2.13. English - Use English or awk Names for Punctuation Variables

$: ($FORMAT_LINE_BREAK _CHARACTERS)

2.9.3. Global Special Variables
7.2.13. English - Use English or awk Names for Punctuation Variables

$, ($LIST_SEPARATOR) : 2.9.3. Global Special Variables

$, ($OUTPUT_FIELD_SEPARATOR)

2.9.3. Global Special Variables
7.2.13. English - Use English or awk Names for Punctuation Variables

$$ ($PROCESS_ID)

2.9.3. Global Special Variables
7.2.13. English - Use English or awk Names for Punctuation Variables

$. ($INPUT_LINE_NUMBER)

2.9.3. Global Special Variables
7.2.13. English - Use English or awk Names for Punctuation Variables
resetting with close function : 3.2.18. close

$= ($FORMAT_LINES_PER_PAGE)

2.8.1. Format Variables
2.9.2. Per-Filehandle Special Variables
7.2.13. English - Use English or awk Names for Punctuation Variables

$- ($FORMAT_LINES_LEFT)

2.9.2. Per-Filehandle Special Variables
7.2.13. English - Use English or awk Names for Punctuation Variables

$< ($REAL_USER_ID)

2.9.3. Global Special Variables
7.2.13. English - Use English or awk Names for Punctuation Variables

$( ($REAL_GROUP_ID)

2.9.3. Global Special Variables
7.2.13. English - Use English or awk Names for Punctuation Variables

$) ($EFFECTIVE_GROUP_ID)

2.9.3. Global Special Variables
7.2.13. English - Use English or awk Names for Punctuation Variables

$% ($FORMAT_PAGE_NUMBER)

2.8.1. Format Variables
2.9.2. Per-Filehandle Special Variables
7.2.13. English - Use English or awk Names for Punctuation Variables

$+ ($LAST_PAREN_MATCH)

2.4.1.3. The fine print
2.9.1. Regular Expression Special Variables
7.2.13. English - Use English or awk Names for Punctuation Variables

$? ($CHILD_ERROR)

2.9.3. Global Special Variables
7.2.13. English - Use English or awk Names for Punctuation Variables
backtick operator and : 2.3.7.1. Command input (backtick) operator
close function and : 3.2.18. close

$" ($LIST_SEPARATOR) : 7.2.13. English - Use English or awk Names for Punctuation Variables

$> ($EFFECTIVE_USER_ID)

2.9.3. Global Special Variables
7.2.13. English - Use English or awk Names for Punctuation Variables

$; ($SUBSCRIPT_SEPARATOR)

2.9.3. Global Special Variables
7.2.13. English - Use English or awk Names for Punctuation Variables

$# ($OFMT) : 2.9.3. Global Special Variables

$/ ($INPUT_RECORD_SEPARATOR)

2.9.3. Global Special Variables
6.1.2. Switches
7.2.13. English - Use English or awk Names for Punctuation Variables

$~ ($FORMAT_NAME)

2.8.1. Format Variables
2.9.2. Per-Filehandle Special Variables
7.2.13. English - Use English or awk Names for Punctuation Variables

$_ ($ARG)

2.9.3. Global Special Variables
7.2.13. English - Use English or awk Names for Punctuation Variables
angle operator and : 2.3.7.2. Line input (angle) operator
forearch statement and : 2.6.4.3. Foreach loops
glob function with : 2.3.7.3. Filename globbing operator
grep function and : 3.2.72. grep
map function and : 3.2.91. map

$_ ($ARG) : 2.4.1.3. The fine print

$| ($OUTPUT_AUTOFLUSH)

2.8.1. Format Variables
2.9.2. Per-Filehandle Special Variables
7.2.13. English - Use English or awk Names for Punctuation Variables

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

.. (range) operator : 2.5.15. Range Operator

.= (assignment) operator : 2.5.17. Assignment Operators

character wildcard

1.7. Regular Expressions
2.4.1.2. The rules of regular expression matching
2.4.1.3. The fine print

concatenation operator

1.5.2. String Operators
2.5.8. Additive Operators
8.3.1. Time Efficiency

debugger command : 8.1.1. Debugger Commands

" (double quotes)

2.3.2.2. String literals
2.4.1.1. The regular expression bestiary
in formline arguments : 3.2.42. formline

= (equal sign)

== (equal to) operator

2.5.12. Equality Operators
8.2.1. Universal Blunders

=> (corresponds to) operator : 2.5.18. Comma Operators

with key/value pairs : 2.3.5. Hashes (Associative Arrays)
with named parameters : 2.3.5. Hashes (Associative Arrays)

=~ (binding) operator : 2.5.6. Binding Operators

assignment operator

1.5.3. Assignment Operators
2.5.17. Assignment Operators

copy constructor : 7.2.48.6. Copy constructor

debugger command : 8.1.1. Debugger Commands

- (hyphen)

2.4.1.2. The rules of regular expression matching

2.5.10. Named Unary and File Test Operators

-*- for Emacs : 6.1.1. Command Processing

-= (assignment) operator : 2.5.17. Assignment Operators

-- (autodecrement) operator

1.5.4. Autoincrement and Autodecrement Operators
2.5.3. Autoincrement and Autodecrement
7.2.48.3. Overloadable operations

-- swtich, Perl : 6.1.2. Switches

-> (arrow) operator

2.5.2. The Arrow Operator
4.3.3. Using the Arrow Operator
5.3.6. Method Invocation
5.5.1. Object-Oriented Scaling Tips

-| piping pseudo-command : 6.2.2.2. Talking to yourself

arithmetic negation operator : 2.5.5. Ideographic Unary Operators

debugger command : 8.1.1. Debugger Commands

subtractive operator : 2.5.8. Additive Operators

< (left angle bracket)

<= (less than or equal) operator : 2.5.11. Relational Operators

<=> (comparison) operator

2.5.12. Equality Operators
3.2.153. sort

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

<< for here documents : 2.3.2.6. "Here" documents

<<= (assignment) operator : 2.5.17. Assignment Operators

<> construct : (see angle operator)

<> option specifier : 7.2.35.3. Non-option callback routine

<FH> operator : 8.2.2. Frequently Ignored Advice

debugger command : 8.1.1. Debugger Commands

for filename globbing operator : 2.3.7.3. Filename globbing operator

in filenames : 3.2.102. open

for left justification : 2.8.1. Format Variables

less than operator : 2.5.11. Relational Operators

for line input operator : 2.3.7.2. Line input (angle) operator

() (parentheses)

2.4.1.1. The regular expression bestiary
2.5. Operators
2.5.1. Terms and List Operators (Leftward)
8.4. Programming with Style
(?!) assertion : 2.4.1.4. Regular expression extensions
(?!...) assertion : 2.4.1.2. The rules of regular expression matching
(?:) for grouping : 2.4.1.4. Regular expression extensions
(?...) assertion : 2.4.1.2. The rules of regular expression matching
(?=) assertion : 2.4.1.4. Regular expression extensions
(?i) modifier : 2.4.1.4. Regular expression extensions
(?#) for comments : 2.4.1.4. Regular expression extensions
for backreferences : 1.7.4. Backreferences
in functions : 3. Functions
grouping operator : 2.4.1.2. The rules of regular expression matching
for list values : 2.3.4. List Values and Arrays

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

%= (assignment) operator : 2.5.17. Assignment Operators
for checksums : 3.2.182. unpack
for hash names : 2.3.1. Variables
modulus operator : 2.5.7. Multiplicative Operators
prototype character : 2.7.3. Prototypes

+ (plus) : 2.5.10. Named Unary and File Test Operators

+= (assignment) operator : 2.5.17. Assignment Operators

++ (autoincrement) operator

1.5.4. Autoincrement and Autodecrement Operators
2.5.3. Autoincrement and Autodecrement
7.2.48.3. Overloadable operations

additive operator : 2.5.8. Additive Operators

in filenames : 3.2.102. open

quantifier

1.7. Regular Expressions
2.4.1.2. The rules of regular expression matching

unary operator : 2.5.5. Ideographic Unary Operators

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

?: (conditional) operator : 2.5.16. Conditional Operator

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

debugger command : 8.1.1. Debugger Commands

quantifier

1.7.1. Quantifiers
2.4.1.2. The rules of regular expression matching

' (single quotes) : 2.3.2.2. String literals

" (double quotes)

2.3.2.2. String literals
2.4.1.1. The regular expression bestiary

> (right angle bracket)

>= (greater than or equal) operator : 2.5.11. Relational Operators
>> (right-shift) operator : 2.5.9. Shift Operators
>>= (assignment) operator : 2.5.17. Assignment Operators
debugger command : 8.1.1. Debugger Commands
for filename globbing operator : 2.3.7.3. Filename globbing operator
in filenames : 3.2.102. open
greater than operator : 2.5.11. Relational Operators
for line input operator : 2.3.7.2. Line input (angle) operator
for right justification : 2.8.1. Format Variables

; (semicolon)

2.6.1. Simple Statements
8.2.1. Universal Blunders

# (sharp)

#! (shebang) notation

1.3.1. How to Do It
6.1.1. Command Processing
6.3.1.3. Security bugs

for comments : 2.4. Pattern Matching

in formats : 2.8. Formats

' (single quotes) : 2.3.2.2. String literals

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

/= (assignment) operator : 2.5.17. Assignment Operators
// operator : (see match (m//) operator)
debugger command : 8.1.1. Debugger Commands
division operator : 2.5.7. Multiplicative Operators
in import list : 7.2.15.1. Specialized import lists
root directory : 3.2.17. chroot

~ (tilde)

bitwise negation operator : 2.5.5. Ideographic Unary Operators
complement operator : 8.2.3. Awk Traps
to supress blank lines : 2.8. Formats

_ (underscore)

2.3.1. Variables
8.2.7. Previous Perl Traps
global filehandle : 2.9.5. Global Special Filehandles
large numbers and : 2.3.2.1. Numeric literals
in variable names : 8.4. Programming with Style

| (vertical bar)

|= (assignment) operator : 2.5.17. Assignment Operators
|- piping pseudo-command : 6.2.2.2. Talking to yourself
|| (debugger command) : 8.1.1. Debugger Commands
|| (OR) operator : 2.5.14. C-style Logical (Short Circuit) Operators
||= (assignment) operator : 2.5.17. Assignment Operators
for alternation : 2.4.1.1. The regular expression bestiary
bitwise OR operator : 2.5.13. Bitwise Operators
for centering : 2.8.1. Format Variables
debugger command : 8.1.1. Debugger Commands
in filenames : 3.2.102. open
for option speficiers : 7.2.35.2. Aliases and abbreviations

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