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Index: U

u command (CPAN.pm) : Perl in a Nutshell, Chapter 2, Reference: u

-u file test operator

Learning Perl, 10.5. The -x File Tests
Perl in a Nutshell, 4.5.8. File Test Operators
Programming Perl, 2.5.10. Named Unary and File Test Operators

-u option (dprofpp) : Perl in a Nutshell, 6.5. The Perl Profiler

-U option (dprofpp) : Perl in a Nutshell, 6.5. The Perl Profiler

\u string escape : Perl Cookbook, 1.9. Controlling Case

\U string escape : Perl Cookbook, 1.9. Controlling Case

-u switch, perl

Perl in a Nutshell, 3.2. Command-Line Options
Programming Perl, 6.1.2. Switches

-U switch, perl

Perl in a Nutshell, 3.2. Command-Line Options
Programming Perl, 6.1.2. Switches

uc()

Perl Cookbook, 1.9. Controlling Case
Perl in a Nutshell, Chapter 5, Reference: uc
Programming Perl, 3.2.177. uc

ucfirst()

Perl Cookbook, 1.9. Controlling Case
Perl in a Nutshell, Chapter 5, Reference: ucfirst
Programming Perl, 3.2.178. ucfirst

UDP protocol

Perl Cookbook, 17.4. Setting Up a UDP Client
Perl Cookbook, 17.5. Setting Up a UDP Server
Programming Perl, 6.2.4.3. UDP: message passing

UDP/IP (User Datagram Protocol) : Advanced Perl Programming, 12.1. Networking Primer

udpmsg program (example) : Perl Cookbook, 17.5. Setting Up a UDP Server

udpqotd program (example) : Perl Cookbook, 17.5. Setting Up a UDP Server

Uhler, Stephen : Advanced Perl Programming, 14.2.1. GUI Forms: The Easy Way

uid (user ID)

(see also $ variables, $< variable; $ variables, $> variable)
Learning Perl, 10.6. The stat and lstat Functions
Programming Perl, 2.9.3. Global Special Variables
Programming Perl, 3.2.15. chown
accessing information : Learning Perl, 16.1. Getting Password and Group Information
assumed : Programming Perl, 6.2.2.2. Talking to yourself
passwd file entry from : Programming Perl, 3.2.63. getpwuid

$uid file statistic : Programming Perl, 3.2.159. stat

$UID ($<) variable

Perl in a Nutshell, 4.4.1. Global Special Variables
Programming Perl, 2.9.3. Global Special Variables
Programming Perl, 7.2.13. English - Use English or awk Names for Punctuation Variables

uidl() (Net::POP3) : Perl in a Nutshell, Chapter 14, Reference: uidl

umask()

Perl in a Nutshell, Chapter 5, Reference: umask
Programming Perl, 3.2.179. umask

umask values : Perl Cookbook, 7.1. Opening a File

uname() (POSIX) : Perl Cookbook, 17.8. Finding Your Own Name and Address

unary operators

Perl in a Nutshell, 4.5.2. Unary Operators

Programming Perl, 7.2.48.2. Calling conventions for unary operations

Programming Perl, 7.2.48.3. Overloadable operations

arithmetic : Programming Perl, 1.5.4. Autoincrement and Autodecrement Operators

glob operator as : Programming Perl, 2.3.7.3. Filename globbing operator

ideographic : Programming Perl, 2.5.5. Ideographic Unary Operators

named

Programming Perl, 2.3.7.3. Filename globbing operator
Programming Perl, 2.5.10. Named Unary and File Test Operators

unbuffered input/output

Perl Cookbook, 7.0. Introduction
Perl Cookbook, 7.12. Flushing Output
Perl Cookbook, 8.0. Introduction
Perl Cookbook, 15.6. Reading from the Keyboard
Programming Perl, 3.2.43. getc

UNC path : Learning Perl on Win32 Systems, 10.3. Using Pathnames and Filenames

uncompressing Perl source code

Perl in a Nutshell, 2.3.1. Installing on Unix
Perl in a Nutshell, 2.3.2.2. Standard Perl distribution

uncontrol subroutine : Perl Cookbook, 15.8. Using POSIX termios

undef

Perl Cookbook, 11.0. Introduction
Learning Perl on Win32 Systems, 2.9. The Undefined Value
Perl in a Nutshell, Chapter 5, Reference: undef
Perl in a Nutshell, 4.2.4. Variables
Programming Perl, 3.2.25. defined
Programming Perl, 3.2.180. undef
Programming Perl, 8.3.1. Time Efficiency
array element access : Learning Perl, 3.4.2. Array Element Access
assigning lists and : Learning Perl, 3.4.1. Assignment
associative array elements : Learning Perl, 5.2. Hash Variables
to control dbmopen() : Learning Perl, 17.2. Opening and Closing DBM Hashes
as default value for $^I : Learning Perl, 17.5. Variable-Length (Text) Databases
definition of : Learning Perl, 2.9. The Undefined Value
globbing return value : Learning Perl, 12.2. Globbing
initial value of local variables : Learning Perl, 8.5. Private Variables in Functions
pop() return value : Learning Perl, 3.4.3. The push and pop Functions
readdir() return value : Learning Perl, 12.5. Reading a Directory Handle
split() return value : Learning Perl, 7.6.1. The split Function
STDIN and : Learning Perl, 6.1. Input from STDIN
to control dbmopen() : Learning Perl on Win32 Systems, 17.2. Opening and Closing DBM Hashes

undefined (undef) value : Perl Cookbook, 1.0. Introduction

undefined scalars : Programming Perl, 2.3.2. Scalar Values

Boolean context and : Programming Perl, 2.3.3.2. Boolean context

undelete_message() (Mail::Folder) : Perl in a Nutshell, Chapter 14, Reference: undelete_message

-underline option (widgets) : Perl in a Nutshell, 18.3. Common Widget Configuration Options

underscore : (see _ (underscore))

undump program : Perl in a Nutshell, 3.2. Command-Line Options

unequal : (see equality operators; relational operators)

unescape_from() (Mail::Internet) : Perl in a Nutshell, Chapter 14, Reference: unescape_from

Unicode : Perl Cookbook, 1.0. Introduction

unimport()

Perl Cookbook, 1.18. Program: psgrep
Perl Cookbook, 13.15. Creating Magic Variables with tie

uninitialized variables : Programming Perl, 1.2.1.1. Singularities

uninstall() : Programming Perl, 7.2.16. ExtUtils::Install - Install Files from Here to There

unions of lists : Perl Cookbook, 4.7. Finding Elements in One Array but Not Another

unique list elements, extracting : Perl Cookbook, 4.6. Extracting Unique Elements from a List

unique_name() (Net::FTP) : Perl in a Nutshell, Chapter 16, Reference: unique_name

uniqueness of objects : Advanced Perl Programming, 11.2.8. Uniqueness of Objects in Memory

UNIVERSAL module

Advanced Perl Programming, 7.3. UNIVERSAL
Perl Cookbook, 13.8. Determining Subclass Membership
Perl in a Nutshell, 8.163. UNIVERSAL
Programming Perl, 5.3.4. A Class Is Simply a Package

Unix

#! (shebang) line : Perl in a Nutshell, 3. The Perl Interpreter
clients/servers : Programming Perl, 6.2.4.2. UNIX-domain clients and servers
command processing : Perl in a Nutshell, 3.1. Command Processing
installing Perl on : Perl in a Nutshell, 2.3.1. Installing on Unix
security bugs : Programming Perl, 6.3.1.3. Security bugs

Unix domain sockets

Perl Cookbook, 17.0. Introduction
Perl Cookbook, 17.6. Using UNIX Domain Sockets
Perl in a Nutshell, 13. Sockets

UnixDate() : Perl Cookbook, 3.7. Parsing Dates and Times from Strings

unless statement

(see if statement)
Learning Perl on Win32 Systems, 9.5. Expression Modifiers
Perl in a Nutshell, 4.3.1. Conditionals and Loops
Perl in a Nutshell, 4.3.1.4. Modifiers
example of : Learning Perl on Win32 Systems, 10.4. A Slight Diversion: die

unlink()

Perl Cookbook, 9.2. Deleting a File
Perl Cookbook, 9.8. Removing a Directory and Its Contents
Learning Perl, 13.1. Removing a File
Perl in a Nutshell, Chapter 5, Reference: unlink
Programming Perl, 3.2.181. unlink
examples of : Learning Perl, A.12. Chapter 13, File and Directory Manipulation

unlinking : (see deleting)

unmark() (News::Newsrc) : Perl in a Nutshell, Chapter 15, Reference: unmark

unmark_list() (News::Newsrc) : Perl in a Nutshell, Chapter 15, Reference: unmark_list

unmark_range() (News::Newsrc) : Perl in a Nutshell, Chapter 15, Reference: unmark_range

unmarked_articles() (News::Newsrc) : Perl in a Nutshell, Chapter 15, Reference: unmarked_articles

unordered lists : (see hashes (associative arrays))

unpack()

Perl Cookbook, 1.1. Accessing Substrings

Perl Cookbook, 1.4. Converting Between ASCII Characters and Values

Perl Cookbook, 8.15. Reading Fixed-Length Records

Learning Perl, 16.2. Packing and Unpacking Binary Data

Perl in a Nutshell, Chapter 5, Reference: unpack

Programming Perl, 3.2.182. unpack

converting binary and decimal numbers : Perl Cookbook, 2.4. Converting Between Binary and Decimal

example of

Learning Perl, 16.3. Getting Network Information
Learning Perl, 17.4. Fixed-Length Random Access Databases
Learning Perl on Win32 Systems, 16.3. Getting Network Information
Learning Perl on Win32 Systems, 17.4. Fixed-Length Random-Access Databases

gethostbyname() return values and : Learning Perl, 16.3. Getting Network Information

return values from gethostbyname() : Learning Perl on Win32 Systems, 16.3. Getting Network Information

unpack_sockaddr_in() (Socket) : Perl in a Nutshell, Chapter 13, Reference: unpack_sockaddr_in

unpack_sockaddr_un() (Socket) : Perl in a Nutshell, Chapter 13, Reference: unpack_sockaddr_un

unpacking Perl source code

Perl in a Nutshell, 2.3.1. Installing on Unix
Perl in a Nutshell, 2.3.2.2. Standard Perl distribution

unpost() (Menu widget) : Perl in a Nutshell, 18.15.2. Menu Methods

unsafe operations

Perl in a Nutshell, 3.2. Command-Line Options
Programming Perl, 6.1.2. Switches

unshift()

Learning Perl, 3.4.4. The shift and unshift Functions
Perl in a Nutshell, Chapter 5, Reference: unshift
Programming Perl, 3.2.183. unshift
circular lists : Perl Cookbook, 4.16. Implementing a Circular List
Tie::IxHash module and : Perl Cookbook, 5.6. Retrieving from a Hash in Insertion Order

unsub_groups() (News::Newsrc) : Perl in a Nutshell, Chapter 15, Reference: unsub_groups

unsubscribe() (News::Newsrc) : Perl in a Nutshell, Chapter 15, Reference: unsubscribe

untie()

Perl Cookbook, 14.1. Making and Using a DBM File
Perl in a Nutshell, Chapter 5, Reference: untie
Programming Perl, 3.2.23. dbmclose
Programming Perl, 3.2.184. untie
Programming Perl, 5.4. Using Tied Variables

until statement

(see while loops)
Learning Perl on Win32 Systems, 9.5. Expression Modifiers
Perl in a Nutshell, 4.3.1.1. while loops
Perl in a Nutshell, 4.3.1.4. Modifiers

up-arrow, in regular expressions : Learning Perl, 7.3.1. Single-Character Patterns

update_message() (Mail::Folder) : Perl in a Nutshell, Chapter 14, Reference: update_message

uppercase : (see case/capitalization)

URI modules : Perl in a Nutshell, 17.5. The URI Module

URI::Escape : Perl in a Nutshell, 17.5. The URI Module

URI::Heuristic

Perl Cookbook, 20.7. Finding Stale Links
Perl in a Nutshell, 17.5. The URI Module

URI::URL : Perl in a Nutshell, 17.5.2. URI::URL

URI::URL module : Perl in a Nutshell, 17.1. LWP Overview

URIs (Universal Resource Identifiers) : Perl in a Nutshell, 17.1. LWP Overview

url()

CGI.pm module : Perl in a Nutshell, Chapter 10, Reference: url
HTTP::Daemon module : Perl in a Nutshell, Chapter 17, Reference: url
HTTP::Request module : Perl in a Nutshell, Chapter 17, Reference: url

urlify program : Perl Cookbook, 6.21. Program: urlify

URLs (uniform resource locators)

(see also Win32 modules, Win32::Internet module)

Perl Cookbook, 19.0. Introduction

Learning Perl, 19. CGI Programming

Perl in a Nutshell, Chapter 19, Reference: CanonicalizeURL

encoding : Perl in a Nutshell, 9.2. URL Encoding

extra path information : Perl in a Nutshell, 9.3. Extra Path Information

extracting from HTML : Perl Cookbook, 20.3. Extracting URLs

fetching from Perl scripts : Perl Cookbook, 20.1. Fetching a URL from a Perl Script

putting HTML links around : Perl Cookbook, 6.21. Program: urlify

redirecting CGI requests : Perl Cookbook, 19.8. Redirecting to a Different Location

URI::URL module

Perl in a Nutshell, 17.1. LWP Overview
Perl in a Nutshell, 17.5.2. URI::URL

use declarations (pragmas)

(see also pragmas)

Advanced Perl Programming, 6.2. Packages and Files

Advanced Perl Programming, 6.5. Importing Symbols

Perl Cookbook, 12.0. Introduction

Learning Perl, 19.4. Passing Parameters via CGI

Learning Perl on Win32 Systems, 18.4. Passing Parameters via CGI

Learning Perl on Win32 Systems, 19.2. Creating Automation Objects

Perl in a Nutshell, 7. Packages, Modules, and Objects

Perl in a Nutshell, 7.2. Modules

trapping errors in : Perl Cookbook, 12.2. Trapping Errors in require or use

use autouse : Perl Cookbook, 12.3. Delaying use Until Run Time

use English : Perl in a Nutshell, 4.4. Special Variables

use integer : Perl in a Nutshell, 4.5.3. Arithmetic Operators

use lib : Perl Cookbook, 12.7. Keeping Your Own Module Directory

use locale

Perl Cookbook, 1.9. Controlling Case
Perl Cookbook, 6.0. Introduction
Perl Cookbook, 6.12. Honoring Locale Settings in Regular Expressions

use overload pragma : Perl Cookbook, 13.14. Overloading Operators

use Socket : Perl in a Nutshell, 13.1.1. Initializing a Socket

use strict : Programming Perl, 8.2.2. Frequently Ignored Advice

use vars : Programming Perl, 7.2.2. AutoLoader - Load Functions Only on Demand

use_alarm() (LWP::UserAgent) : Perl in a Nutshell, Chapter 17, Reference: use_alarm

use_named_parameters() (CGI.pm) : Perl in a Nutshell, Chapter 10, Reference: use_named_parameters

Usenet news

Perl Cookbook, 18.4. Reading and Posting Usenet News Messages

Perl in a Nutshell, 15. Usenet News

Net::News module : Perl in a Nutshell, 15.2. Net::NNTP

News::Newsrc module : Perl in a Nutshell, 15.3. The News::Newsrc Module

Perl-related newsgroups

Learning Perl, Support
Perl in a Nutshell, 1.4.1. The comp.lang.perl.* Newsgroups

use() : Perl in a Nutshell, Chapter 5, Reference: use

user()

Mail::Address module

Perl in a Nutshell, Chapter 14, Reference: user
Perl in a Nutshell, 14.2.6. Parse Email Addresses with Mail::Address

Net::POP3 module

Perl in a Nutshell, Chapter 14, Reference: user
Perl in a Nutshell, 14.1.3. Retrieving Email with Net::POP3

URI::URL module : Perl in a Nutshell, Chapter 17, Reference: user

User() (Mail::POP3Client) : Perl in a Nutshell, Chapter 14, Reference: User

user_agent() (CGI.pm) : Perl in a Nutshell, Chapter 10, Reference: user_agent

USER command (POP3) : Perl in a Nutshell, 14.1.3. Retrieving Email with Net::POP3

user-defined functions : (see subroutines)

user-defined structures : Advanced Perl Programming, 2.1. User-Defined Structures

matrices example : Advanced Perl Programming, 2.2. Example: Matrices

user efficiency : Programming Perl, 8.3.6. User Efficiency

user function : (see subroutines)

User::grent module : Perl in a Nutshell, 8.164. User::grent

user ID : (see uid (user ID))

user input : (see input)

user interfaces : (see GUIs (graphical user interfaces))

user_name() (CGI.pm) : Perl in a Nutshell, Chapter 10, Reference: user_name

User::pwent module : Perl in a Nutshell, 8.165. User::pwent

UserAgent() (Win32::Internet) : Perl in a Nutshell, Chapter 19, Reference: UserAgent

UserAgent object

Perl in a Nutshell, 17.1. LWP Overview
Perl in a Nutshell, 17.2. The LWP Modules
Perl in a Nutshell, 17.2.3. LWP::UserAgent

UserCreate() (Win32::NetAdmin) : Perl in a Nutshell, Chapter 19, Reference: UserCreate

Username() (Win32::Internet) : Perl in a Nutshell, Chapter 19, Reference: Username

usernames

Learning Perl, 16.1. Getting Password and Group Information
Programming Perl, 3.2.62. getpwnam

users

fetching information on : Perl in a Nutshell, 5.1. Perl Functions by Category

user CPU time

Programming Perl, 3.2.174. times
Programming Perl, 7.2.4.1. Notes

userstats program (example) : Perl Cookbook, 14.1. Making and Using a DBM File

"uses" relationship : Programming Perl, 5.5.7. Implementation (the "Uses" Relationship)

/usr/dict/words : Learning Perl, 7.7. Exercises

utime()

Perl Cookbook, 9.1. Getting and Setting Timestamps
Learning Perl, 13.7. Modifying Timestamps
Learning Perl on Win32 Systems, 13.5. Modifying Timestamps
Perl in a Nutshell, Chapter 5, Reference: utime
Programming Perl, 3.2.186. utime

utmp file : (see /etc/utmp file)

UUCP : Learning Perl, UUCP

uvi program (example) : Perl Cookbook, 9.1. Getting and Setting Timestamps

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