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U

-u file test operator : Named Unary and File Test Operators
-U switch, perl : Switches
-u switch, perl : Switches
<u> tags : The <u> Tag
uc function : uc
ucfirst function : ucfirst
UDP communications : UDP: message passing
$UID (see $< variable)
uid (user ID) (see also $<)
chown
assumed : Talking to yourself
passwd file entry from : getpwuid
UID (user identification)
File Permission Problems
Set UID/GID Wrapper
$uid file statistic : stat
<ul> tag : <ul>
<ul> tags
Unordered, Ordered, and Definition Lists
The <ul> Tag
The style and class attributes
umask function : umask
unary operators
Calling conventions for unary operations
Overloadable operations
Number of Operands
arithmetic : Autoincrement and Autodecrement Ope...
glob operator as : Filename globbing operator
ideographic : Ideographic Unary Operators
named
Filename globbing operator
Named Unary and File Test Operators
new
Data Type Wrapper Objects
Object Creation Operator (new)
Creating New Objects with Constructors
Creating Arrays
typeof
Undefined
The typeof Operator
typeof operator : Conversions to Objects
typeof operators : Core Language Changes
void
The void Operator
JavaScript in URLs
- (negation) : Unary Negation (-)
"Unauthorized" status code
Status Codes
Checking Hypertext (HTTP) Links
unbuffered input : getc
uncgi library
C Shell (UNIX Only)
C/C++
C/C++ decoding using uncgi
undef (value) : defined
undef function
undef
Time Efficiency
undefined
scalars : Scalar Values
Boolean context and : Boolean context
undefined (value)
Undefined
Undefined Object Properties
converting
Conversions to Strings
Conversions to Numbers
Conversions to booleans
Conversions to Objects
underlining (nroff) : UNIX Manual Page Gateway
underscore (see _)
underscoring : The <u> Tag
unequal (see equality operators; relational operators)
unescape( ) : unescape( ) Function
unescape()
Reading Cookies
unescape()
uniform resource locators (see URLs)
uninitialized
variables : Singularities
uninstall( ) : ExtUtils::Install--Install Files fr...
units attribute (<embed>) : The units attribute
UNIVERSAL class : A Class Is Simply a Package
Universal Coordinated Time (UTC) : Date.UTC( ) Method
universal resource identifiers (see URIs)
UNIX (see environment variables)
clients/servers : UNIX-domain clients and servers
manual pages
UNIX Manual Page Gateway
security bugs : Security bugs
sockets in : Overview
variables (see environment variables)
Unix platforms : Window.open() method
browser background color : Document Properties
data tainting on : Enabling Data Tainting in Navigator 3.0
window size and : Window Size on Unix Platforms
unless statement (see if statement)
unlink command : CGI Side Includes
unlink function : unlink
UNLINK method : Other methods
unlinking (see deleting)
unnamed functions : The Function() Constructor
unordered lists
Unordered, Ordered, and Definition Lists
Unordered Lists
The style and class attributes
<ul>
custom bullets : Custom Bullets
nesting : Nested Unordered Lists
unpack function : unpack
unsafe characters in URLs : Handling reserved and unsafe characters
unsafe operations : Switches
unshift function : unshift
untaint( ) : untaint( ) Function
untaint()
JavaScript Security
The taint() and untaint() Functions
untaint()
untie function
dbmclose
untie
Using Tied Variables
until statement (see while loop)
untyped variables : Untyped Variables
updating databases : Updating a database
Upgrade header : Upgrade
uploading files
BasePlus.pm
uptime command : Server Redirection
URI header
Results Processing
URI
URIs (uniform resource identifiers) : Uniform Resource Locators (URLs)
URL object
URL
URL.hash
URL.host
URL.hostname
URL.href
URL.pathname
URL.port
URL.protocol
URL.search
URL property
Miscellaneous Changes
Document Properties
Document.URL
Properties
URL protocol specifiers
javascript:
Exploring JavaScript
JavaScript URL Execution
mailto:
Security Holes and Security Hobbles
Security Hobbles in Navigator 3.0
URLs
Document.URL
about:cache : Security Holes and Security Hobbles
extracting information from : The Location Object
javascript: protocol specifier : JavaScript in URLs
referral : Document Properties
URLs (uniform resource locators)
URLs
Referencing Documents: The URL
Using relative URLs
Uniform Resource Locators (URLs)
<base> tag for
The <base> Header Element
Using <base>
checking with socket library : Checking Hypertext (HTTP) Links
cookies for : Cookies
encoding for forms
URL Encoding
The <form> Tag
extra path information : Extra Path Information
generating randomly : A random URL generator
http
The http URL
Sample http URLs
imagemaps of : Introduction to Imagemaps
JavaScript : JavaScript URLs
Location object : Location Object
query : The query URL
randomly following : Random Links
returning by redirection : Server Redirection
as style property values : URL property values
urn attribute
<link> tag : Attributes
<a> tag : Attributes
urn attribute (<a>) : The urn attribute
URNs (universal resource names) : The urn attribute
use command : Employee database
use declarations (see pragmas)
use strict : Frequently Ignored Advice
use vars pragma : AutoLoader--Load Functions Only on ...
usemap attribute
<img> tag : Attributes
<img>
Image Maps
The ismap and usemap attributes
<object> : The shapes and usemap attributes
<object> tag : Attributes
Usenet, JavaScript newsgroups : Discussion of JavaScript
user
CPU times : times
user CPU time : Notes
user efficiency : User Efficiency
user ID (see uid)
user identification (UID)
File Permission Problems
Set UID/GID Wrapper
user interface design : User Interface Considerations
User-Agent header
Compatibility Through CGI Scripts
User-Agent
user-defined functions (see subroutines)
userAgent property
The Navigator, MimeType, and Plugin...
Compatibility Through CGI Scripts
Navigator.userAgent
Properties
username
passwd file entry from : getpwnam
users (see forms)
addresses of (see REMOTE_ADDR)
authenticating : User Authentication and Identification
counting (see access counters)
information from (see forms)
input from (see input)
interacting with
Interact with the User
Using the Java System Classes
names of (see REMOTE_HOST)
notifying of browser incompatibility : Notifying Users of Old Browsers
"uses" relationship : Implementation (the "Uses" Relationship)
UTC( )
Methods
Date.UTC( ) Method
UTC() : Date.UTC()
utime function : utime
utmp file (see /etc/utmp file)


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