Symbols | 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 | Explanatory note

Symbols and Numbers

-0 switch, perl : Switches
& (ampersand) : Named Unary and File Test Operators address-of operator (in C) : C Operators Missing from Perl bitwise AND operator : Bitwise Operators in filenames : open prototype character : Prototypes for subroutine names Variables Subroutines && (AND) operator : C-style Logical (Short Circuit) Operators &&= (assignment) operator : Assignment Operators &= (assignment) operator : Assignment Operators
* (asterisk) : Named Unary and File Test Operators

dereference operator (in C) : C Operators Missing from Perl
multiplicative operator : Multiplicative Operators
prototype character : Prototypes
quantifier

Quantifiers
The rules of regular expression matching

for typeglob names

Typeglobs and Filehandles
Passing Symbol Table Entries (Typeglobs)

** (exponentiation) operator : Exponentiation
**= (assignment) operator : Assignment Operators
*= (assignment) operator : Assignment Operators
@ (at sign) : Previous Perl Traps for array names : Variables in debugger : Using the Debugger in picture lines : Formats prototype character : Prototypes @_ array Subroutines English--Use English or awk Names for Punctuation Variables Debugger Bugs
\ (backslash) to escape metacharacters : The regular expression bestiary for multiline commands : Using the Debugger quotemeta function for : quotemeta reference operator Ideographic Unary Operators The Backslash Operator
` (backtick) : Anonymous pipes emulating : Cleaning up your path operator Command input (backtick) operator Shell Traps Programming with Style
! (bang) for argument specifiers : Getopt::Long--Extended Processing of Command-Line Options debugger command : Debugger Commands in import list : Specialized import lists logical negation operator : Ideographic Unary Operators !! debugger command : Debugger Commands != (not equal to) operator Equality Operators Universal Blunders !~ (binding) operator : Binding Operators
{ } (braces) Braces, Brackets, and Quoting Universal Blunders Programming with Style in awk : Awk Traps for statement blocks : Compound Statements hash composer : The Anonymous Hash Composer identifiers in : String literals quantifier Quantifiers The rules of regular expression matching
[ ] (brackets) array composer : The Anonymous Array Composer to match characters : The rules of regular expression matching
^ (caret) assertion : Quantifiers bitwise XOR operator Bitwise Operators Awk Traps line boundary Nailing Things Down The rules of regular expression matching The fine print matching : The rules of regular expression matching in picture lines : Formats ^= (assignment) operator : Assignment Operators
: (colon) in import list : Specialized import lists :: for package identifiers Packages Previous Perl Traps
, (comma) : Universal Blunders delimiting list values : List Values and Arrays key/value pairs and : Hashes (Associative Arrays) large numbers and : Numeric literals operator Comma Operators Awk Traps
$ (dollar sign) for backreferences (see backreferences) in debugger : Using the Debugger line boundary The rules of regular expression matching The fine print prototype character : Prototypes for scalar variable names : Variables word boundary : Nailing Things Down $# prefix : List Values and Arrays
$ variables $0 ($PROGRAM_NAME) Global Special Variables English--Use English or awk Names for Punctuation Variables $1, $2, $3... (see backreferences) $& ($MATCH) The fine print Regular Expression Special Variables a2p English--Use English or awk Names for Punctuation Variables Time Efficiency $' ($POSTMATCH) The fine print Regular Expression Special Variables a2p English--Use English or awk Names for Punctuation Variables Time Efficiency $* ($MULTILINE_MATCHING) : Regular Expression Special Variables $@ ($EVAL_ERROR) Global Special Variables English--Use English or awk Names for Punctuation Variables $\ ($OUTPUT_RECORD_SEPARATOR) Global Special Variables Switches English--Use English or awk Names for Punctuation Variables $` ($PREMATCH) The fine print Regular Expression Special Variables a2p English--Use English or awk Names for Punctuation Variables Time Efficiency $! ($OS_ERROR) Global Special Variables English--Use English or awk Names for Punctuation Variables $[ : Global Special Variables $] ($PERL_VERSION) Global Special Variables English--Use English or awk Names for Punctuation Variables $^ ($FORMAT_TOP_NAME) Format Variables Per-Filehandle Special Variables English--Use English or awk Names for Punctuation Variables Universal Blunders $^A ($ACCUMULATOR) Accessing Formatting Internals Global Special Variables English--Use English or awk Names for Punctuation Variables formline function : formline $^D ($DEBUGGING) Global Special Variables Switches English--Use English or awk Names for Punctuation Variables $^F ($SYSTEM_FD_MAX) Global Special Variables English--Use English or awk Names for Punctuation Variables $^H : Global Special Variables $^I ($INPLACE_EDIT) Global Special Variables English--Use English or awk Names for Punctuation Variables $^L ($FORMAT_LINEFEED) Format Variables Global Special Variables English--Use English or awk Names for Punctuation Variables $^O ($OSNAME) Global Special Variables English--Use English or awk Names for Punctuation Variables $^P ($PERLDB) Global Special Variables English--Use English or awk Names for Punctuation Variables $^T ($BASETIME) Named Unary and File Test Operators Global Special Variables English--Use English or awk Names for Punctuation Variables $^W ($WARNING) Global Special Variables English--Use English or awk Names for Punctuation Variables $^X ($EXECUTABLE_NAME) Global Special Variables English--Use English or awk Names for Punctuation Variables $: ($FORMAT_LINE_BREAK _CHARACTERS) Global Special Variables English--Use English or awk Names for Punctuation Variables $, ($OUTPUT_FIELD_SEPARATOR) Global Special Variables English--Use English or awk Names for Punctuation Variables $$ ($PROCESS_ID) Global Special Variables English--Use English or awk Names for Punctuation Variables $. ($INPUT_LINE_NUMBER) Global Special Variables English--Use English or awk Names for Punctuation Variables resetting with close function : close $= ($FORMAT_LINES_PER_PAGE) Format Variables Per-Filehandle Special Variables English--Use English or awk Names for Punctuation Variables $- ($FORMAT_LINES_LEFT) Per-Filehandle Special Variables English--Use English or awk Names for Punctuation Variables $< ($REAL_USER_ID) Global Special Variables English--Use English or awk Names for Punctuation Variables $( ($REAL_GROUP_ID) Global Special Variables English--Use English or awk Names for Punctuation Variables $) ($EFFECTIVE_GROUP_ID) Global Special Variables English--Use English or awk Names for Punctuation Variables $% ($FORMAT_PAGE_NUMBER) Format Variables Per-Filehandle Special Variables English--Use English or awk Names for Punctuation Variables $+ ($LAST_PAREN_MATCH) The fine print Regular Expression Special Variables English--Use English or awk Names for Punctuation Variables $? ($CHILD_ERROR) Global Special Variables English--Use English or awk Names for Punctuation Variables backtick operator and : Command input (backtick) operator close function and : close $" ($LIST_SEPARATOR) : English--Use English or awk Names for Punctuation Variables $> ($EFFECTIVE_USER_ID) Global Special Variables English--Use English or awk Names for Punctuation Variables $; ($SUBSCRIPT_SEPARATOR) Global Special Variables English--Use English or awk Names for Punctuation Variables $# ($OFMT) : Global Special Variables $/ ($INPUT_RECORD_SEPARATOR) Global Special Variables Switches English--Use English or awk Names for Punctuation Variables $~ ($FORMAT_NAME) Format Variables Per-Filehandle Special Variables English--Use English or awk Names for Punctuation Variables $_ ($ARG) The fine print Global Special Variables English--Use English or awk Names for Punctuation Variables angle operator and : Line input (angle) operator forearch statement and : Foreach loops glob function with : Filename globbing operator grep function and : grep map function and : map $| ($OUTPUT_AUTOFLUSH) Format Variables Per-Filehandle Special Variables English--Use English or awk Names for Punctuation Variables
. (dot) : Named Unary and File Test Operators character wildcard Regular Expressions The rules of regular expression matching The fine print concatenation operator String Operators Additive Operators Time Efficiency debugger command : Debugger Commands .. (range) operator : Range Operator .= (assignment) operator : Assignment Operators
= (equal sign) assignment operator Assignment Operators Assignment Operators copy constructor : Copy constructor debugger command : Debugger Commands sortas="@equalright">=> (corresponds to) operator : Comma Operators = = (equal to) operator Equality Operators Universal Blunders => (corresponds to) operator with key/value pairs : Hashes (Associative Arrays) with named parameters : Hashes (Associative Arrays) =~ (binding) operator : Binding Operators
- (hyphen) The rules of regular expression matching Named Unary and File Test Operators arithmetic negation operator : Ideographic Unary Operators debugger command : Debugger Commands subtractive operator : Additive Operators -*- for Emacs : Command Processing -= (assignment) operator : Assignment Operators - - (autodecrement) operator Autoincrement and Autodecrement Operators Autoincrement and Autodecrement Switches Overloadable operations -> (arrow) operator The Arrow Operator Using the Arrow Operator Object-Oriented Scaling Tips -| piping pseudo-command : Talking to yourself
< (left angle bracket) debugger command : Debugger Commands for filename globbing operator : Filename globbing operator in filenames : open for left justification : Format Variables less than operator : Relational Operators for line input operator : Line input (angle) operator <= (less than or equal) operator : Relational Operators <=> (comparison) operator Equality Operators sort << for here documents "Here" documents Shift Operators <<= (assignment) operator : Assignment Operators < > construct (see angle operator) Non-option callback routine <FH> operator : Frequently Ignored Advice
( ) (parentheses) The regular expression bestiary Operators Terms and List Operators (Leftward) Programming with Style for backreferences : Backreferences in functions : Functions grouping operator : The rules of regular expression matching for list values : List Values and Arrays (?!) assertion : Regular expression extensions (?!...) assertion : The rules of regular expression matching (?:) for grouping : Regular expression extensions (?...) assertion : The rules of regular expression matching (?=) assertion : Regular expression extensions (?i) modifier : Regular expression extensions (?#) for comments : Regular expression extensions
% (percent sign) : Named Unary and File Test Operators for checksums : unpack for hash names : Variables modulus operator : Multiplicative Operators prototype character : Prototypes %= (assignment) operator : Assignment Operators
+ (plus) : Named Unary and File Test Operators additive operator : Additive Operators in filenames : open quantifier Regular Expressions The rules of regular expression matching unary operator : Ideographic Unary Operators += (assignment) operator : Assignment Operators ++ (autoincrement) operator Autoincrement and Autodecrement Operators Autoincrement and Autodecrement Overloadable operations
? (question mark) : Named Unary and File Test Operators debugger command : Debugger Commands quantifier Quantifiers The rules of regular expression matching ?: (conditional) operator : Conditional Operator ?? operator (see m?? operator)
' (single quotes) : String literals
" (double quotes) String literals The regular expression bestiary in formline arguments : formline
> (right angle bracket) debugger command : Debugger Commands for filename globbing operator : Filename globbing operator in filenames : open greater than operator : Relational Operators for line input operator : Line input (angle) operator for right justification : Format Variables >= (greater than or equal) operator : Relational Operators >> (right-shift) operator : Shift Operators >>= (assignment) operator : Assignment Operators
; (semicolon) Simple Statements Universal Blunders
# (sharp) for comments : Pattern Matching in formats : Formats #! (shebang) notation How to Do It Command Processing Security bugs
/ (slash) : Named Unary and File Test Operators debugger command : Debugger Commands division operator : Multiplicative Operators in import list : Specialized import lists root directory : chroot /= (assignment) operator : Assignment Operators // operator (see match operator)
~ (tilde) bitwise negation operator : Ideographic Unary Operators complement operator : Awk Traps to supress blank lines : Formats
_ (underscore) Variables Previous Perl Traps global filehandle : Global Special Filehandles large numbers and : Numeric literals in variable names : Programming with Style
| (vertical bar) for alternation : The regular expression bestiary bitwise OR operator : Bitwise Operators for centering : Format Variables debugger command : Debugger Commands in filenames : open for option speficiers : Aliases and abbreviations |= (assignment) operator : Assignment Operators |- piping pseudo-command : Talking to yourself || (OR) operator : C-style Logical (Short Circuit) Operators debugger command : Debugger Commands ||= (assignment) operator : Assignment Operators

Symbols | 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
Explanatory note