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{ } (curly braces)
{{{ and }}} sequences in comments: 14.3.4. Fleshing Out the Skeleton (Programming PHP)
as pattern delimiters: 4.10.1. Delimiters (Programming PHP)
enclosing array lookup in: 5.4. Multidimensional Arrays (Programming PHP)
in code blocks: 2.1.2. Statements and Semicolons (Programming PHP)
2.5.1. if (Programming PHP)
variable interpolation in strings: 4.1.1. Variable Interpolation (Programming PHP)
- (hyphen): 13.2.5. Multiple Commands (Running Linux)
-> construct, accessing properties and methods: 2.2.6. Objects (Programming PHP)
6.3. Accessing Properties and Methods (Programming PHP)
defining character range in regular expressions: 4.8.2. Character Classes (Programming PHP)
inline pattern matching options, turning off: 4.10.9. Inline Options (Programming PHP)
- (minus sign)
-- (autodecrement) operator: 2.4.7. Autoincrement and Autodecrement Operators (Programming PHP)
- (arithmetic negation) operator: 2.4.5. Arithmetic Operators (Programming PHP)
-= (subtraction assignment) operator: 2.4.12.2. Assignment with operation (Programming PHP)
- (subtraction) operator: 2.4.5. Arithmetic Operators (Programming PHP)
in Boolean mode searches: 3.9.1.3. Boolean mode (Managing & Using MySQL)
for right-justified strings: 4.2.3.1. Format modifiers (Programming PHP)
subtraction operator: 3.8. SQL Operators (Managing & Using MySQL)
17.1.2. Arithmetic Operators (Managing & Using MySQL)
& (ampersand): 6.3. Common Features (Linux in a Nutshell)
&= (bitwise AND assignment) operator: 2.4.12.2. Assignment with operation (Programming PHP)
& (bitwise AND) operator: 2.4.9. Bitwise Operators (Programming PHP)
converting to HTML entity: 4.5.1.1. Entity-quoting all special characters (Programming PHP)
ex: 11.14. Alphabetical Summary of ex Commands (Linux in a Nutshell)
11.14. Alphabetical Summary of ex Commands (Linux in a Nutshell)
indicating passing by reference: 3.4.2. Passing Parameters by Reference (Programming PHP)
logical AND: 3.1. Alphabetical Summary of Commands (Linux in a Nutshell)
/* and*/
multiline comments in C: 15.1.3. Comments (Managing & Using MySQL)
multiline comments in PHP scripts: 11.1.1. A Short Language Primer (Managing & Using MySQL)
< > (angle brackets) ex: 11.14. Alphabetical Summary of ex Commands (Linux in a Nutshell)
* (asterisk): 6.3. Common Features (Linux in a Nutshell)
7.2.2. Filename Metacharacters (Linux in a Nutshell)
*= (multiplication assignment) operator: 2.4.12.2. Assignment with operation (Programming PHP)
* (multiplication) operator: 2.4.5. Arithmetic Operators (Programming PHP)
in Boolean mode searches: 3.9.1.3. Boolean mode (Managing & Using MySQL)
extended regular expression: 3.8.4. Pattern Matching (Managing & Using MySQL)
in greedy and non-greedy quantifiers: 4.10.5. Quantifiers and Greed (Programming PHP)
multiplication operator: 3.1. Alphabetical Summary of Commands (Linux in a Nutshell)
3.8. SQL Operators (Managing & Using MySQL)
17.1.2. Arithmetic Operators (Managing & Using MySQL)
naming tables in ON clause: 6.1.2.1. GRANT and REVOKE (Managing & Using MySQL)
@ (at)
ex: 11.14. Alphabetical Summary of ex Commands (Linux in a Nutshell)
tcsh: 8.9. Built-in Commands (Linux in a Nutshell)
13.2.5. Multiple Commands (Running Linux)
function call prefix when using showerror( ): 11.3.5. Handling MySQL Errors (Managing & Using MySQL)
identifying users to MySQL: 6.1.2.1. GRANT and REVOKE (Managing & Using MySQL)
error suppression operator: 2.4.13. Miscellaneous Operators (Programming PHP)
` (backquote): 7.2.4. Quoting (Linux in a Nutshell)
\ (backslash): 6.3. Common Features (Linux in a Nutshell)
escape character: 3.6.1. Inserts (Managing & Using MySQL)
escape sequences for MySQL: 15.1.1. Literals (Managing & Using MySQL)
escaping
in lookbehind pattern assertions: 4.10.10. Lookahead and Lookbehind (Programming PHP)
in single-quoted strings: 4.1.2. Single-Quoted Strings (Programming PHP)
regular expression metacharacters: 4.8.1. The Basics (Programming PHP)
exporting tab delimited data: 15.2. SQL Commands (Managing & Using MySQL)
in SQL queries: 4.5.3. SQL (Programming PHP)
removing from escaped strings: A.3d. Alphabetical Listing of PHP Functions (r-z) (Programming PHP)
` (backtick) operator: 2.4.13. Miscellaneous Operators (Programming PHP)
security risks of: 12.7. Shell Commands (Programming PHP)
! (bang): 6.3. Common Features (Linux in a Nutshell)
ex: 11.14. Alphabetical Summary of ex Commands (Linux in a Nutshell)
shell invocation, ftp: 3.1. Alphabetical Summary of Commands (Linux in a Nutshell)
!~ (bang tilde), gawk: 13.2.1. Patterns (Linux in a Nutshell)
| (bitwise OR operator): 17.1.2. Arithmetic Operators (Managing & Using MySQL)
{ } (braces), sed command: 12.2.1.1. Examples (Linux in a Nutshell)
[ ] (brackets): 6.3. Common Features (Linux in a Nutshell)
7.2.2. Filename Metacharacters (Linux in a Nutshell)
as pattern delimiters: 4.10.1. Delimiters (Programming PHP)
[[:>:]] end of word anchor in regular expressions: 4.9.2. Anchors (Programming PHP)
in regular expression character classes: 4.8.2. Character Classes (Programming PHP)
extended regular expression: 3.8.4. Pattern Matching (Managing & Using MySQL)
start of word anchor in regular expressions: 4.9.2. Anchors (Programming PHP)
^ (caret)
^= (bitwise XOR assignment) operator: 2.4.12.2. Assignment with operation (Programming PHP)
^ (bitwise XOR) operator: 2.4.9. Bitwise Operators (Programming PHP)
negating regular expression character classes: 4.8.2. Character Classes (Programming PHP)
start of line anchor, Perl regular expressions: 4.10.4. Anchors (Programming PHP)
start of string anchor in regular expressions: 4.8.1. The Basics (Programming PHP)
4.9.2. Anchors (Programming PHP)
extended regular expression: 3.8.4. Pattern Matching (Managing & Using MySQL)
gawk: 13.2.1. Patterns (Linux in a Nutshell)
: (colon)
ex editor: 11. The vi Editor (Linux in a Nutshell)
pattern search, expr: 3.1. Alphabetical Summary of Commands (Linux in a Nutshell)
sed: 12.4. Alphabetical Summary of sed Commands (Linux in a Nutshell)
:set command (ex): 11.15.1. The :set Command (Linux in a Nutshell)
tcsh null command: 8.9. Built-in Commands (Linux in a Nutshell)
ending if line: 2.5.1. if (Programming PHP)
, (comma)
ASCII value for: 4.7.4. String-Searching Functions (Programming PHP)
two or more, skipping array values in list( ): 5.5. Extracting Multiple Values (Programming PHP)
$ (dollar): 6.3. Common Features (Linux in a Nutshell)
execute macro command, ftp: 3.1. Alphabetical Summary of Commands (Linux in a Nutshell)
gawk: 13.2.1. Patterns (Linux in a Nutshell)
prompt: 0.. Conventions (Linux in a Nutshell)
sed: 12.2.1. Pattern Addressing (Linux in a Nutshell)
extended regular expression: 3.8.4. Pattern Matching (Managing & Using MySQL)
in regular expressions: 4.8.1. The Basics (Programming PHP)
4.9.2. Anchors (Programming PHP)
4.10.2. Match Behavior (Programming PHP)
4.10.4. Anchors (Programming PHP)
in variable names: 2.1.6.1. Variable names (Programming PHP)
2.3. Variables (Programming PHP)
variable identifier in PHP: 11.1.1. A Short Language Primer (Managing & Using MySQL)
. (dot): 7.7. Built-in Commands (Linux in a Nutshell)
.+ (concatenation assignment) operator: 2.4.12.2. Assignment with operation (Programming PHP)
. (string concatenation) operator: 2.4.6. String Concatenation Operator (Programming PHP)
in cookie names, decoding: 7.6.1. Cookies (Programming PHP)
in HTML field names, converting for PHP variables: 7.4.2. Parameters (Programming PHP)
single-character matches in regular expressions: 4.8.1. The Basics (Programming PHP)
wildcard match character: 4.10.2. Match Behavior (Programming PHP)
== (double equals), variable equality test in PHP: 11.1.1. A Short Language Primer (Managing & Using MySQL)
?? (double question marks): 3.1. Alphabetical Summary of Commands (Linux in a Nutshell)
" " (double quotes): 6.3. Common Features (Linux in a Nutshell)
= (equal sign)
comparison operator: 3.8. SQL Operators (Managing & Using MySQL)
=> symbol, separating array indexes from values: 5.3. Storing Data in Arrays (Programming PHP)
variable assignment operator in PHP: 11.1.1. A Short Language Primer (Managing & Using MySQL)
= (equals)
ex: 11.14. Alphabetical Summary of ex Commands (Linux in a Nutshell)
sed: 12.4. Alphabetical Summary of sed Commands (Linux in a Nutshell)
= (equals sign)
= (assignment) operator: 2.4.12.1. Assignment (Programming PHP)
== (equal to) operator: 2.2.3. Strings (Programming PHP)
2.4.8. Comparison Operators (Programming PHP)
comparing strings with: 4.6.1. Exact Comparisons (Programming PHP)
=== (identity) operator: 2.4.8. Comparison Operators (Programming PHP)
comparing strings with: 4.6.1. Exact Comparisons (Programming PHP)
testing return value for failure: 4.7.4. String-Searching Functions (Programming PHP)
\% escape sequence (MySQL): 15.1.1. Literals (Managing & Using MySQL)
\( \) (escaped parentheses): 3.1. Alphabetical Summary of Commands (Linux in a Nutshell)
! (exclamation point)
!= (inequality) operator: 2.4.8. Comparison Operators (Programming PHP)
!== (not identical) operator: 2.4.8. Comparison Operators (Programming PHP)
type specification modifier: 14.7. Parameter Handling (Programming PHP)
/ (forward slash)
division operator: 3.1. Alphabetical Summary of Commands (Linux in a Nutshell)
sed command: 12.2.1. Pattern Addressing (Linux in a Nutshell)
#! (hash bang): 7.7. Built-in Commands (Linux in a Nutshell)
tcsh shell: 8.9. Built-in Commands (Linux in a Nutshell)
# (hash mark): 4.3.2. The GRUB Configuration File (Linux in a Nutshell)
6.3. Common Features (Linux in a Nutshell)
13.2.2. Some Syntax Rules (Running Linux)
in shell scripts: 7.7. Built-in Commands (Linux in a Nutshell)
sed: 12.4. Alphabetical Summary of sed Commands (Linux in a Nutshell)
tcsh shell: 8.9. Built-in Commands (Linux in a Nutshell)
root account prompt: 5.1. Maintaining the System (Running Linux)
in comments: 2.1.4.1. Shell-style comments (Programming PHP)
- (hyphen) and metamail command: 3.1. Alphabetical Summary of Commands (Linux in a Nutshell)
!= (inequality operator): 3.8. SQL Operators (Managing & Using MySQL)
17.1.3. Comparison Operators (Managing & Using MySQL)
- (minus operator): 3.1. Alphabetical Summary of Commands (Linux in a Nutshell)
% (modulo operator): 3.1. Alphabetical Summary of Commands (Linux in a Nutshell)
! (NOT logical operator): 17.1.4. Logical Operators (Managing & Using MySQL)
: (null command): 7.7. Built-in Commands (Linux in a Nutshell)
|| (OR logical operator): 17.1.4. Logical Operators (Managing & Using MySQL)
( ) parentheses
in Boolean mode searches: 3.9.1.3. Boolean mode (Managing & Using MySQL)
overriding precedence rules: 3.8.1. Logical Operators (Managing & Using MySQL)
% (percent sign): 6.4. Differing Features (Linux in a Nutshell)
bash job ID argument: 7.6. Job Control (Linux in a Nutshell)
modulo of two values: 17.1.2. Arithmetic Operators (Managing & Using MySQL)
pattern matching character: 3.8.4. Pattern Matching (Managing & Using MySQL)
9.1.4. Introducing Bind Variables and Optimizations (Managing & Using MySQL)
prompt: 0.. Conventions (Linux in a Nutshell)
%= (modulus assignment) operator: 2.4.12.2. Assignment with operation (Programming PHP)
% (modulus) operator: 2.4.5. Arithmetic Operators (Programming PHP)
in format string to printf( ): 4.2.3. printf( ) (Programming PHP)
. (period), extended regular expression: 3.8.4. Pattern Matching (Managing & Using MySQL)
| (pipe): 6.3. Common Features (Linux in a Nutshell)
7.2.2. Filename Metacharacters (Linux in a Nutshell)
as logical OR symbol: 3.1. Alphabetical Summary of Commands (Linux in a Nutshell)
+ (plus sign) operator: 3.1. Alphabetical Summary of Commands (Linux in a Nutshell)
fvwm2: 19.1.1. Configuration Files (Linux in a Nutshell)
+= (addition assignment) operator: 2.4.12.2. Assignment with operation (Programming PHP)
+ (addition) operator: 2.4.5. Arithmetic Operators (Programming PHP)
+ (arithmetic assertion) operator: 2.4.5. Arithmetic Operators (Programming PHP)
++ (autoincrement) operator: 2.4.7. Autoincrement and Autodecrement Operators (Programming PHP)
addition operator: 3.8. SQL Operators (Managing & Using MySQL)
17.1.2. Arithmetic Operators (Managing & Using MySQL)
in Boolean mode searches: 3.9.1.3. Boolean mode (Managing & Using MySQL)
in greedy and non-greedy quantifiers: 4.10.5. Quantifiers and Greed (Programming PHP)
printing positive numbers with: 4.2.3.1. Format modifiers (Programming PHP)
spaces, encoding in URLs: 4.5.2.2. Query-string encoding (Programming PHP)
9.6. Dynamically Generated Buttons (Programming PHP)
# (pound sign)
comments in configuration files: 4.1.2. File Content (Managing & Using MySQL)
one-line comments in C: 15.1.3. Comments (Managing & Using MySQL)
one-line comments in PHP scripts: 11.1.1. A Short Language Primer (Managing & Using MySQL)
($$) prototype, method handlers and: 25.1.5. Method Handlers (Practical mod_perl)
? (question mark): 6.3. Common Features (Linux in a Nutshell)
7.2.2. Filename Metacharacters (Linux in a Nutshell)
?: (conditional) operator: 2.4.13. Miscellaneous Operators (Programming PHP)
2.5.1. if (Programming PHP)
ftp help command): 3.1. Alphabetical Summary of Commands (Linux in a Nutshell)
in non-greedy quantifiers: 4.10.5. Quantifiers and Greed (Programming PHP)
placeholder in database queries: 8.4.1. Placeholders (Programming PHP)
replacing characters outside target encoding: 11.3.6.1. Character encoding (Programming PHP)
' (quotes, single)
HTML entity for: 4.5.1.1. Entity-quoting all special characters (Programming PHP)
in heredocs: 4.1.4. Here Documents (Programming PHP)
in SQL queries: 4.5.3. SQL (Programming PHP)
in string literals: 2.2.3. Strings (Programming PHP)
escape sequences in: 2.2.3. Strings (Programming PHP)
single-quoted strings: 4.1.2. Single-Quoted Strings (Programming PHP)
> (redirection operator): 6.3. Common Features (Linux in a Nutshell)
; (semicolon): 6.3. Common Features (Linux in a Nutshell)
after terminating heredoc identifier: 4.1.4. Here Documents (Programming PHP)
before PHP closing tag: 2.1.2. Statements and Semicolons (Programming PHP)
comments in configuration files: 4.1.2. File Content (Managing & Using MySQL)
in PHP statements: 2.1.2. Statements and Semicolons (Programming PHP)
statement termination character in PHP scripts: 11.1.1. A Short Language Primer (Managing & Using MySQL)
; (semicolon), importance of: 21.5.1. Locating and Correcting Syntax Errors (Practical mod_perl)
' ' (single quotes): 6.3. Common Features (Linux in a Nutshell)
/ (slash)
/* */, in multiline C-style comments: 2.1.4.3. C comments (Programming PHP)
/= (division assignment) operator: 2.4.12.2. Assignment with operation (Programming PHP)
/ (division) operator: 2.4.5. Arithmetic Operators (Programming PHP)
type specification modifier: 14.7. Parameter Handling (Programming PHP)
directories: 4.4.1. Directories (Running Linux)
division operator: 3.8. SQL Operators (Managing & Using MySQL)
17.1.2. Arithmetic Operators (Managing & Using MySQL)
-t option, validating server configuration: 5.5. Validating Server Configuration (Practical mod_perl)
-T switch: 6.5.2.2. Taint mode (Practical mod_perl)
~ (tilde)
bash: 7.2.2. Filename Metacharacters (Linux in a Nutshell)
ex: 11.14. Alphabetical Summary of ex Commands (Linux in a Nutshell)
gawk: 13.2.1. Patterns (Linux in a Nutshell)
sed: 12.2.1. Pattern Addressing (Linux in a Nutshell)
tcsh: 8.7.1. Completion (Linux in a Nutshell)
bitwise negation operator: 2.4.9. Bitwise Operators (Programming PHP)
directories: 4.4.1. Directories (Running Linux)
in Boolean mode searches: 3.9.1.3. Boolean mode (Managing & Using MySQL)
in vi editor: 9.1.1. Starting vi (Running Linux)
=== (triple equals), parameter equality test in PHP: 11.1.1. A Short Language Primer (Managing & Using MySQL)
_ (underscore)
_ _ , method names beginning with: 6.4.1. Declaring Methods (Programming PHP)
converting dots (.) in cookie names to: 7.6.1. Cookies (Programming PHP)
converting dots (.) in HTML field names to: 7.4.2. Parameters (Programming PHP)
pattern matching character: 3.8.4. Pattern Matching (Managing & Using MySQL)
$$ variable: 9.3. Process Memory Measurements (Practical mod_perl)
| (vertical bar)
|= (bitwise OR assignment) operator: 2.4.12.2. Assignment with operation (Programming PHP)
| (bitwise OR) operator: 2.4.9. Bitwise Operators (Programming PHP)
alternatives, in regular expressions: 4.8.3. Alternatives (Programming PHP)
type specification modifier: 14.7. Parameter Handling (Programming PHP)
-X switch: 5.2. Starting the Server in Single-Process Mode (Practical mod_perl)

Numbers

1-to-1 relationships: 7.2.5. Kinds of Relationships (Managing & Using MySQL)
designing models for maintainable Perl programs: 9.3.1. A Model for Relational Data (Managing & Using MySQL)
object/relational modeling: 8.3. Object/Relational Modeling (Managing & Using MySQL)
1-to-M relationships: 7.2.5. Kinds of Relationships (Managing & Using MySQL)
7.4.2. Foreign Keys (Managing & Using MySQL)
designing models for maintainable Perl programs: 9.3.1. A Model for Relational Data (Managing & Using MySQL)
wedding gift registry database: 11.3.1. The Wedding Gift Registry Database (Managing & Using MySQL)
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