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Symbols and Numbers

-0 switch, perl : Switches
1/2, square root of (constant) : Math.SQRT1_2
2, square root of (constant) : Math.SQRT2
200 (Success) code Status Codes Checking Hypertext (HTTP) Links
204 (No Response) code The "No Response" Code Graphics
211 (Success) code : Network News on the Web
221 (Success) code : Network News on the Web
222 (Success) code : Network News on the Web
3-D borders (see borders)
301 (Document Moved) code : Status Codes
401 (Unauthorized) code Status Codes Checking Hypertext (HTTP) Links
403 (Forbidden) code : Status Codes
404 (Not Found) code Status Codes Checking Hypertext (HTTP) Links
500 (Internal Server Error) code What should I do when I get a "Serv... Status Codes Tcl
501 (Not Implemented) code : Status Codes
& (ampersand) Programming with Style address-of operator (in C) : C Operators Missing from Perl bitwise AND operator Bitwise Operators Bitwise And (<tt CLASS=replaceable>... to delimit field information : Submit and Reset Buttons for entities Special text characters Character Entities JavaScript Entities Named Unary and File Test Operators Transferring the Form Data JavaScript Entities in filenames : open in key-value pairs : Sending Data to the Server prototype character : Prototypes for subroutine names Variables Subroutines in URLs : Transferring the Form Data && (logical AND) operator C-style Logical (Short Circuit) Ope... Miscellaneous Differences Logical And (<tt CLASS=replaceable>... Logical and, or, not, and xor &&= (assignment) operator : Assignment Operators &{} for entities Core Language Changes JavaScript Entities &= (assignment) operator : Assignment Operators
< > (angle brackets) : HTML Tag Syntax
' (apostrophe) String Literals Escape Sequences in String Literals
* (asterisk)

Named Unary and File Test Operators
Multiplication (*)
dereference operator (in C) : C Operators Missing from Perl
frame size : Frame Layout
as media type wildcard : Media Types and Subtypes
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 f... Debugger Bugs
\ (backslash) Escape Sequences in String Literals 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 `` command : C Shell
! (bang) for argument specifiers : Getopt::Long--Extended Processing o... debugger command : Debugger Commands in import list : Specialized import lists logical negation operator : Ideographic Unary Operators : Logical Not (!) !! debugger command : Debugger Commands != (not equal to) operator Inequality (!=) Equality Operators Universal Blunders !~ (binding) operator : Binding Operators
{ } (braces) Compound Statements Braces, Brackets, and Quoting Universal Blunders Programming with Style function 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) Arrays Array and Object Access Operators for...in Objects as Associative Arrays Reading and Writing Array Elements Conversions to Objects The Anonymous Array Composer to match characters : The rules of regular expression matching
^ (caret) assertion : Quantifiers bitwise XOR operator Bitwise Operators Awk Traps Bitwise Xor (^) 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 separating Macintosh directories : AppleScript :: 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 The Comma Operator (,) Awk Traps for in styles : Multiple Selectors
{} curly braces (see braces)
$ (dollar sign) Identifiers 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 f... $1, $2, $3... (see backreferences) $& ($MATCH) The fine print Regular Expression Special Variables a2p English--Use English or awk Names f... Time Efficiency $' ($POSTMATCH) The fine print Regular Expression Special Variables a2p English--Use English or awk Names f... Time Efficiency $* ($MULTILINE_MATCHING) : Regular Expression Special Variables $@ ($EVAL_ERROR) Global Special Variables English--Use English or awk Names f... $\ ($OUTPUT_RECORD_SEPARATOR) Global Special Variables Switches English--Use English or awk Names f... $` ($PREMATCH) The fine print Regular Expression Special Variables a2p English--Use English or awk Names f... Time Efficiency $! ($OS_ERROR) Global Special Variables English--Use English or awk Names f... $[ : Global Special Variables $] ($PERL_VERSION) Global Special Variables English--Use English or awk Names f... $^ ($FORMAT_TOP_NAME) Format Variables Per-Filehandle Special Variables English--Use English or awk Names f... Universal Blunders $^A ($ACCUMULATOR) Accessing Formatting Internals Global Special Variables English--Use English or awk Names f... formline function : formline $^D ($DEBUGGING) Global Special Variables Switches English--Use English or awk Names f... $^F ($SYSTEM_FD_MAX) Global Special Variables English--Use English or awk Names f... $^H : Global Special Variables $^I ($INPLACE_EDIT) Global Special Variables English--Use English or awk Names f... $^L ($FORMAT_LINEFEED) Format Variables Global Special Variables English--Use English or awk Names f... $^O ($OSNAME) Global Special Variables English--Use English or awk Names f... $^P ($PERLDB) Global Special Variables English--Use English or awk Names f... $^T ($BASETIME) Named Unary and File Test Operators Global Special Variables English--Use English or awk Names f... $^W ($WARNING) Global Special Variables English--Use English or awk Names f... $^X ($EXECUTABLE_NAME) Global Special Variables English--Use English or awk Names f... $: ($FORMAT_LINE_BREAK _CHARACTERS) Global Special Variables English--Use English or awk Names f... $, ($OUTPUT_FIELD_SEPARATOR) Global Special Variables English--Use English or awk Names f... $$ ($PROCESS_ID) Global Special Variables English--Use English or awk Names f... $. ($INPUT_LINE_NUMBER) Global Special Variables English--Use English or awk Names f... resetting with close function : close $= ($FORMAT_LINES_PER_PAGE) Format Variables Per-Filehandle Special Variables English--Use English or awk Names f... $- ($FORMAT_LINES_LEFT) Per-Filehandle Special Variables English--Use English or awk Names f... $< ($REAL_USER_ID) Global Special Variables English--Use English or awk Names f... $( ($REAL_GROUP_ID) Global Special Variables English--Use English or awk Names f... $) ($EFFECTIVE_GROUP_ID) Global Special Variables English--Use English or awk Names f... $% ($FORMAT_PAGE_NUMBER) Format Variables Per-Filehandle Special Variables English--Use English or awk Names f... $+ ($LAST_PAREN_MATCH) The fine print Regular Expression Special Variables English--Use English or awk Names f... $? ($CHILD_ERROR) Global Special Variables English--Use English or awk Names f... backtick operator and : Command input (backtick) operator close function and : close $" ($LIST_SEPARATOR) : English--Use English or awk Names f... $> ($EFFECTIVE_USER_ID) Global Special Variables English--Use English or awk Names f... $; ($SUBSCRIPT_SEPARATOR) Global Special Variables English--Use English or awk Names f... $# ($OFMT) : Global Special Variables $/ ($INPUT_RECORD_SEPARATOR) Global Special Variables Switches English--Use English or awk Names f... $~ ($FORMAT_NAME) Format Variables Per-Filehandle Special Variables English--Use English or awk Names f... $_ ($ARG) The fine print Global Special Variables English--Use English or awk Names f... 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 f... Digital Clock
. (dot) Named Unary and File Test Operators Array and Object Access Operators Reading and Writing Object Properties Arrays in Navigator 2.0 Conversions to Objects 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 Assignment Operators The assign() Method Previous Perl Traps combined with operations : Assignment with Operation copy constructor : Copy constructor debugger command : Debugger Commands defining tag attributes : The Syntax of a Tag == (equal to) operator Equality Operators Universal Blunders Equality (==) => (corresponds to) operator Comma Operators with key/value pairs : Hashes (Associative Arrays) with named parameters : Hashes (Associative Arrays) =~ (binding) operator : Binding Operators
> (greater than) operator Relational Operators String Operators >= (greater than or equal) operator Relational Operators Greater Than or Equal (>=) String Operators >> (shift right with sign) operator : Shift Right with Sign (>>) >>> (shift right zero fill) operator : Shift Right Zero Fill (>>>)
- (hyphen) The rules of regular expression matching arithmetic negation operator Ideographic Unary Operators Named Unary and File Test Operators Unary Negation (-) debugger command : Debugger Commands subtractive operator Additive Operators Subtraction (-) -*- for Emacs : Command Processing -= (assignment) operator : Assignment Operators -- (autodecrement) operator Autoincrement and Autodecrement Ope... Autoincrement and Autodecrement Switches Overloadable operations Decrement (--) -> (arrow) operator The Arrow Operator Using the Arrow Operator Object-Oriented Scaling Tips -| piping pseudo-command : Talking to yourself
< (left angle bracket) Non-option callback routine Special text characters String Operators debugger command : Debugger Commands filename globbing operator : Filename globbing operator in filenames : open for left justification : Format Variables less than operator Relational Operators Less Than (<) line input operator : Line input (angle) operator  tags Comments Comments Comments Hiding Scripts from Old Browsers (see also SSI) <= (less than or equal) operator Relational Operators Less Than or Equal (<=) String Operators <=> (comparison) operator Equality Operators sort << (shift left) operator "Here" documents Shift Operators Shift Left (<<) <<= (assignment) operator : Assignment Operators < > construct (see angle brackets)
( ) (parentheses) The regular expression bestiary Operators Terms and List Operators (Leftward) Programming with Style Functions Objects Operator Precedence Function Call Operator Defining and Invoking Functions 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) Tailoring SSI Output for checksums : unpack for date/time data : Configurable Time Formats for SSI Output for hash names : Variables modulus operator Multiplicative Operators Modulo (%) Named Unary and File Test Operators prototype character : Prototypes in URLs : Writing a URL %2F sequence : URL Encoding %= (assignment) operator : Assignment Operators
+ (plus) Named Unary and File Test Operators Workarounds for Navigator 2.0 additive operator Additive Operators Addition (+) concatenation operator : Strings String Operators Conversions to Strings 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 Ope... Autoincrement and Autodecrement Overloadable operations Increment (++)
# (pound sign) for comments : Pattern Matching for entities : Special text characters in formats : Formats for name anchors Hyperlink Names and Navigation Linking Within a Document in server side includes : Common Errors with uncgi : C Shell (csh) in URLs : The http document fragment #! (shebang) notation How to Do It Command Processing Security bugs
? (question mark) Query Strings Handling reserved and unsafe characters The http search parameter Named Unary and File Test Operators debugger command : Debugger Commands quantifier Quantifiers The rules of regular expression matching ?: (conditional) operator Conditional Operator The Conditional Operator (?:) ?? operator (see m?? operator)
" (quotation mark) Braces, Brackets, and Quoting Pick your own quotes String Literals String literals The regular expression bestiary for attribute values : The Syntax of a Tag in braces : String literals double-quote context : Interpolative context in formline arguments : formline qq/../ construct : Mail Gateway strings and : String literals in URLs : Handling reserved and unsafe characters
> (right angle bracket) debugger command : Debugger Commands filename globbing operator : Filename globbing operator in filenames : open greater than operator : Relational Operators line input operator : Line input (angle) operator for right justification : Format Variables >= (greater than or equal) operator Relational Operators Greater Than or Equal (>=) String Operators >> (right-shift) operator : Shift Operators >>= (assignment) operator : Assignment Operators
; (semicolon) Netscape Persistent Cookies Simple Statements Universal Blunders Optional Semicolons Statements
# (sharp)
' (single quotes) String literals String Literals
/ (slash) Named Unary and File Test Operators debugger command : Debugger Commands division operator Multiplicative Operators Division (/) in ending HTML tags Start and End Tags HTML Tag Syntax in import list : Specialized import lists root directory : chroot in URLs Handling reserved and unsafe characters The http path URL Encoding /= (assignment) operator : Assignment Operators // comment marker : Comments /* */ comment marker : Comments // match operator (see match operator)
~ (tilde) The http path bitwise negation operator Bitwise Not (~) 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 Bitwise Or (|) for centering : Format Variables debugger command Debugger Commands Debugger Commands in filenames : open for option specifiers : Aliases and abbreviations |= (assignment) operator : Assignment Operators |- piping pseudo-command : Talking to yourself || (logical OR) operator C-style Logical (Short Circuit) Ope... Miscellaneous Differences Logical Or (||) ||= (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