Index: U

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## Index: U

\U (uppercase) characters: 4.6.4. Character Classes (Perl in a Nutshell)
u command (CPAN.pm): 2.4.4. Installing Modules with the CPAN Module (Perl in a Nutshell)
-u (dump core) command-line switch: 19.1.3. Switches (Programming Perl)
\u escape: 5.2.3. The s/// Operator (Substitution) (Programming Perl)
-u file test operator: 4.5.8. File Test Operators (Perl in a Nutshell)
-u option (dprofpp): 6.5. The Perl Profiler (Perl in a Nutshell)
-u (setuid) file test: 3.10. Named Unary and File Test Operators (Programming Perl)
\u shortcut: 9.6.5. Case Shifting (Learning Perl)
\U string escape: 1.13.2. Solution (Perl Cookbook)
-U (unsafe) command-line switch: 19.1.3. Switches (Programming Perl)
ualarm( ): 3.9.3. Discussion (Perl Cookbook)
uc( ): 5. Function Reference (Perl in a Nutshell)
  1.13.2. Solution (Perl Cookbook)
  29.2.184. uc (Programming Perl)
  15.2. Effects of Character Semantics (Programming Perl)
ucfirst( ): 5. Function Reference (Perl in a Nutshell)
  1.13.2. Solution (Perl Cookbook)
  29.2.185. ucfirst (Programming Perl)
  15.2. Effects of Character Semantics (Programming Perl)
UDP: Glossary (Programming Perl)
  passing messages with: 16.5.3. Message Passing (Programming Perl)
UDP packets: 16.5. Sockets (Programming Perl)
UDP (User Datagram Protocol)
  writing clients for: 17.4.1. Problem (Perl Cookbook)
  writing servers for: 17.5.1. Problem (Perl Cookbook)
uid (user-ID): 11.6.1. The stat and lstat Functions (Learning Perl)
$UID ($<) variable: 4.4.1. Global Special Variables (Perl in a Nutshell)
uidl( ) (Net::POP3): 16.1.3. Retrieving Email with Net::POP3 (Perl in a Nutshell)
umask( ): 5. Function Reference (Perl in a Nutshell)
umask function: 29.2.186. umask (Programming Perl)
  Glossary (Programming Perl)
umask values: 7.1.3. Discussion (Perl Cookbook)
uname( ): 17.8.2. Solution (Perl Cookbook)
unary operators: 4.5.2. Unary Operators (Perl in a Nutshell)
  1.5. Operators (Programming Perl)
  3. Unary and Binary Operators (Programming Perl)
  3. Unary and Binary Operators (Programming Perl)
  arithmetic: 1.5.4. Unary Arithmetic Operators (Programming Perl)
  Boolean: 1.5.7. Some File Test Operators (Programming Perl)
  class handler, invoking: 13.1. The overload Pragma (Programming Perl)
  functions, behaving as: 3.1. Terms and List Operators (Leftward) (Programming Perl)
  ideographic: 3.5. Ideographic Unary Operators (Programming Perl)
  list operators, distinguishing from: 3.10. Named Unary and File Test Operators (Programming Perl)
  named: 2.11.3. Filename Globbing Operator (Programming Perl)
    3.1. Terms and List Operators (Leftward) (Programming Perl)
    3.10. Named Unary and File Test Operators (Programming Perl)
    listing of: 3.10. Named Unary and File Test Operators (Programming Perl)
  prototyping functions as: 6.4.2. Care with Prototypes (Programming Perl)
unbind method (Net::LDAP): 19.4. Net::LDAP Methods (Perl in a Nutshell)
unbuffered input/output: 7.. I/O Operations (Perl Cookbook)
  7.19.3. Discussion (Perl Cookbook)
  8.. Advanced Operations (Perl Cookbook)
  15.6.1. Problem (Perl Cookbook)
uncompress command: 2.3.1. Installing on Unix (Perl in a Nutshell)
uncompressing Perl source code: 2.3.2.2. Standard Perl distribution (Perl in a Nutshell)
undef( ): 5. Function Reference (Perl in a Nutshell)
  compared to delete( ): 5.4.3. Discussion (Perl Cookbook)
  24.2.1. Time Efficiency (Programming Perl)
  29.2.187. undef (Programming Perl)
  arrays, freeing memory from: 2.8.2. Array Length (Programming Perl)
  2.12. The defined Function (Learning Perl)
  slices and: 17.6. Slices (Learning Perl)
undef value: 2.11. The undef Value (Learning Perl)
  4.2.5. Variables (Perl in a Nutshell)
undefined scalars: 2.6. Scalar Values (Programming Perl)
undefined subroutines, calling with AUTOLOAD: 10.2. Autoloading (Programming Perl)
undefined values: 1.. Introduction (Perl Cookbook)
undelete_message( ) (Mail::Folder): 16.2.3. Handle Folders with Mail::Folder (Perl in a Nutshell)
-underline option (widgets): 21.3. Common Widget Configuration Options (Perl in a Nutshell)
_(underscore)
  global filehandle: 28.2. Special Variables in Alphabetical Order (Programming Perl)
underscore (_)
  filehandle: 4.4.3. Global Special Filehandles (Perl in a Nutshell)
  improving number legibility: 4.2.1. Numbers (Perl in a Nutshell)
  in integer literals: 2.2.3. Integer Literals (Learning Perl)
  in variable names: 4.10. The use strict Pragma (Learning Perl)
underscore (_), file stat cache: 9.. Introduction (Perl Cookbook)
underscore filehandle: 11.6.5. Using the Special Underscore Filehandle (Learning Perl)
Underscore module: 14.1.3. Magically Banishing $_ (Programming Perl)
unequal (see equality operators[semi] relational operators)
unescape_from( ) (Mail::Internet): 16.2.5. Mail::Internet Reference (Perl in a Nutshell)
Unicode: 1.. Unicode Support in Perl (Perl Cookbook)
  B.30. Locales and Unicode (Learning Perl)
  2.1. Atoms (Programming Perl)
  15. Unicode (Programming Perl)
  case translation tables: 15.2. Effects of Character Semantics (Programming Perl)
  character database: 1.5.3. Discussion (Perl Cookbook)
  combined characters, canonicalizing strings with: 1.9.1. Problem (Perl Cookbook)
  converting Microsoft files to: 8.21.1. Problem (Perl Cookbook)
  converting to characters: 29.2.14. chr (Programming Perl)
  editors for: 15.2. Effects of Character Semantics (Programming Perl)
  encodings, XML and: 22.. XML Declaration (Perl Cookbook)
  information about: 5.4.3. Unicode Properties (Programming Perl)
  line separator character: 2.2. Molecules (Programming Perl)
  locales and: 29.2.82. lc (Programming Perl)
  named characters, using: 1.5.1. Problem (Perl Cookbook)
  paragraph separator character: 2.2. Molecules (Programming Perl)
  Perl properties for: 5.4. Character Classes (Programming Perl)
  properties: 5.4.3. Unicode Properties (Programming Perl)
    bidirectional rendering: 5.4.3.2. Standard Unicode properties (Programming Perl)
    block properties: 5.4.3.3. Unicode block properties (Programming Perl)
    decomposition of characters: 5.4.3.2. Standard Unicode properties (Programming Perl)
    Perl character class shortcuts and: 5.4.2. Classic Perl Character Class Shortcuts (Programming Perl)
    Perl composites: 5.4.3.1. Perl's Unicode properties (Programming Perl)
    standard: 5.4.3.2. Standard Unicode properties (Programming Perl)
    syllabaries, classifying by vowel sounds: 5.4.3.2. Standard Unicode properties (Programming Perl)
  properties database: 15.2. Effects of Character Semantics (Programming Perl)
  reading and writing from filehandles: 8.20.1. Problem (Perl Cookbook)
  smiley face: 29.2.14. chr (Programming Perl)
  strings
    treating as octets: 1.10.1. Problem (Perl Cookbook)
    treating as single characters: 1.8.1. Problem (Perl Cookbook)
  summary of, accessing: 15.2. Effects of Character Semantics (Programming Perl)
  support for, turning on: 32.1.6. Internationalization and Locale (Programming Perl)
  titlecase, converting strings to: 5.2.4. The tr/// Operator (Transliteration) (Programming Perl)
  Unicode Standard, Version 3.0: 15.2. Effects of Character Semantics (Programming Perl)
  use in Perl, caveats on: 15.3. Caution, [ren2bold] Working (Programming Perl)
  wildcard metasymbols, matching with: 5.3.3. Wildcard Metasymbols (Programming Perl)
Unicode characters: 1.7. Regular Expressions (Programming Perl)
  in identifiers: 2.5. Names (Programming Perl)
  smiley: 2.6.2. String Literals (Programming Perl)
Uniform Resource Locators (see URLs)
unimport( ): 13.15.4. Tie Example: Outlaw $_ (Perl Cookbook)
unimport method (Exporter): 12.10. Exporting in a Primarily OO Module (Learning Perl Objects, References and Modules)
uninitialized, variables: 1.2.1.1. Singularities (Programming Perl)
unions of lists: 4.8.1. Problem (Perl Cookbook)
  computing: 4.9.1. Problem (Perl Cookbook)
unique list elements, extracting: 4.7.1. Problem (Perl Cookbook)
unique_name( ) (Net::FTP): 18.2. Net::FTP (Perl in a Nutshell)
universal character code: 1.. The Universal Character Code (Perl Cookbook)
UNIVERSAL class: 12.5.3. UNIVERSAL: The Ultimate Ancestor Class (Programming Perl)
  inheritance and: 8.5. A Few Notes About @ISA (Learning Perl Objects, References and Modules)
  methods, adding to: 12.5.3. UNIVERSAL: The Ultimate Ancestor Class (Programming Perl)
  purpose of: 11.1. UNIVERSAL Methods (Learning Perl Objects, References and Modules)
  utility methods: 11.2. Testing Your Objects for Good Behavior (Learning Perl Objects, References and Modules)
    11.2. Testing Your Objects for Good Behavior (Learning Perl Objects, References and Modules)
UNIVERSAL module: 13.8.3. Discussion (Perl Cookbook)
  8.228. UNIVERSAL (Perl in a Nutshell)
  32.1.14. Convenient Classes (Programming Perl)
Universal Time: 11.6.2. The localtime Function (Learning Perl)
Unix: Glossary (Programming Perl)
  domain sockets: 17.. Introduction (Perl Cookbook)
    17.6.1. Problem (Perl Cookbook)
  input/output and: 11.1. What Is a Filehandle? (Learning Perl)
  I/O layers: 7.19.3. Discussion (Perl Cookbook)
  model of files/directories and: 13.3. Links and Files (Learning Perl)
  portability and: 1.1.2. Why Are There So Many Footnotes? (Learning Perl)
  security bugs: 23.2.1. Unix Kernel Security Bugs (Programming Perl)
  truncating kernel interpretation of #! line: 19.1. Command Processing (Programming Perl)
  utilities for
    diamond operator and: 6.2. Input from the Diamond Operator (Learning Perl)
    regular expressions and: 7. Concepts of Regular Expressions (Learning Perl)
Unix-domain sockets: 15. Sockets (Perl in a Nutshell)
unix layer: 7.. I/O Operations (Perl Cookbook)
  7.19.3. Discussion (Perl Cookbook)
Unix, test command, test scripts and: 1.3.1. How to Do It (Programming Perl)
Unix password databases: B.7.1. Direct System Database Access (Learning Perl)
Unix signals, sending/receiving: 14.7. Sending and Receiving Signals (Learning Perl)
Unix, CPAN modules, installing on: 22.2.1. Decompressing and Unpacking CPAN Modules (Programming Perl)
Unix systems: 1.2.1.1. Singularities (Programming Perl)
  #! (shebang) line: 3. The Perl Executable (Perl in a Nutshell)
  command processing: 3.1. Command Processing (Perl in a Nutshell)
  fileglobbing: 32.1.4. Filenames, Filesystems, and File Locking (Programming Perl)
  File::Spec::Unix module: 32.1.4. Filenames, Filesystems, and File Locking (Programming Perl)
  installing Perl on: 2.3.1. Installing on Unix (Perl in a Nutshell)
  sockets for: 32.1.8. Networking and Interprocess Communication (Programming Perl)
UnixDate( ): 3.7.3. Discussion (Perl Cookbook)
unless control structure: 10.1. The unless Control Structure (Learning Perl)
unless modifier: 10.3. Expression Modifiers (Learning Perl)
  10.3. Expression Modifiers (Learning Perl)
  4.3.1.4. Modifiers (Perl in a Nutshell)
  4.1. Simple Statements (Programming Perl)
unless statement: 4.3.1. Conditionals and Loops (Perl in a Nutshell)
  1.6.1.1. The if and unless statements (Programming Perl)
  if statements, using instead of: 4.3. if and unless Statements (Programming Perl)
unlink( ): 5. Function Reference (Perl in a Nutshell)
  removing directories and contents: 9.8.3. Discussion (Perl Cookbook)
  29.2.188. unlink (Programming Perl)
  13.1. Removing Files (Learning Perl)
  2.7.2. Boolean Context (Programming Perl)
unmark( ) (News::Newsrc): 17.3.1. News::Newsrc Reference (Perl in a Nutshell)
unmarked_articles( ) (News::Newsrc): 17.3.1. News::Newsrc Reference (Perl in a Nutshell)
unmark_list( ) (News::Newsrc): 17.3.1. News::Newsrc Reference (Perl in a Nutshell)
unmark_range( ) (News::Newsrc): 17.3.1. News::Newsrc Reference (Perl in a Nutshell)
unordered lists (see hashes)
unpack: 25.2. Endianness and Number Width (Programming Perl)
  1.1.2. Solution (Perl Cookbook)
  1.4.3. Discussion (Perl Cookbook)
  fixed-length records: 8.15.2. Solution (Perl Cookbook)
  16.2. Manipulating Data with pack and unpack (Learning Perl)
  29.2.189. unpack (Programming Perl)
  fixed-width fields, use with: Glossary (Programming Perl)
  template characters for: 29.2.108. pack (Programming Perl)
unpacking CPAN modules: 22.2.1. Decompressing and Unpacking CPAN Modules (Programming Perl)
unpacking Perl source code: 2.3.2.2. Standard Perl distribution (Perl in a Nutshell)
unpack_sockaddr_in( ) (Socket): 15.1.4. Socket Module Functions (Perl in a Nutshell)
unpack_sockaddr_un( ) (Socket): 15.1.4. Socket Module Functions (Perl in a Nutshell)
Unparsed handler (Expat): 13.3. Expat Handlers (Perl in a Nutshell)
unpost( ) (Menu widget): 21.15.2. Menu Methods (Perl in a Nutshell)
unqualified, names, searching for: 2.5.1. Name Lookups (Programming Perl)
unquoted hash keys: 17.4. Unquoted Hash Keys (Learning Perl)
unread bytes, determining number: 7.21.1. Problem (Perl Cookbook)
unsafe operations: 19.1.3. Switches (Programming Perl)
unshift( ): 5. Function Reference (Perl in a Nutshell)
  circular lists: 4.17.2. Solution (Perl Cookbook)
  2.5.1. Extending @INC (Learning Perl Objects, References and Modules)
  12.7. Setting the Path at the Right Time (Learning Perl Objects, References and Modules)
  9. Data Structures (Programming Perl)
  29.2.190. unshift (Programming Perl)
  3.4.2. The shift and unshift Operators (Learning Perl)
unsigned integers, lists of, storing: 29.2.195. vec (Programming Perl)
unsigned shorts: 29.2.162. sprintf (Programming Perl)
unsub_groups( ) (News::Newsrc): 17.3.1. News::Newsrc Reference (Perl in a Nutshell)
unsubscribe( ) (News::Newsrc): 17.3.1. News::Newsrc Reference (Perl in a Nutshell)
untie( ): 5. Function Reference (Perl in a Nutshell)
untie function: 14. Tied Variables (Programming Perl)
  14.5. A Subtle Untying Trap (Programming Perl)
  29.2.21. dbmclose (Programming Perl)
  29.2.191. untie (Programming Perl)
  outstanding references, not eliminating: 14.1. Tying Scalars (Programming Perl)
until control structure: 10.2. The until Control Structure (Learning Perl)
until loops: 4.4.1. while and until Statements (Programming Perl)
until modifier: 10.3. Expression Modifiers (Learning Perl)
  10.3. Expression Modifiers (Learning Perl)
  4.3.1.4. Modifiers (Perl in a Nutshell)
  4.1. Simple Statements (Programming Perl)
until statement: 4.3.1.1. while loops (Perl in a Nutshell)
untying trap: 14.5. A Subtle Untying Trap (Programming Perl)
unwinding hashes: 5.2.1. The Hash as a Whole (Learning Perl)
up method: 17.2.3.2. Semaphores (Programming Perl)
upcase function: 6.2.1. Tricks with Parameter Lists (Programming Perl)
update_message( ) (Mail::Folder): 16.2.3. Handle Folders with Mail::Folder (Perl in a Nutshell)
updating random-access files: 8.13.1. Problem (Perl Cookbook)
uppercase
  case shifting and: 9.6.5. Case Shifting (Learning Perl)
  vs. lowercase in variable names: 2.5.1. Choosing Good Variable Names (Learning Perl)
  converting to: 2.6.2. String Literals (Programming Perl)
  5.2.3. The s/// Operator (Substitution) (Programming Perl)
uppercase, converting to lowercase: 1.13.1. Problem (Perl Cookbook)
URI modules: 20.5. The URI Module (Perl in a Nutshell)
  URI::Escape: 20.5. The URI Module (Perl in a Nutshell)
  URI::Heuristic: 20.5. The URI Module (Perl in a Nutshell)
  URI::URL: 20.5.3. URI::URL (Perl in a Nutshell)
  URI::URL module: 20.1. LWP Overview (Perl in a Nutshell)
uri( ) (SOAP::Lite): 14.2. SOAP::Lite (Perl in a Nutshell)
uri_escape( ): 20.2.3. Discussion (Perl Cookbook)
URI::Escape module: 20.2.3. Discussion (Perl Cookbook)
URI::Heuristic module: 20.1.3. Discussion (Perl Cookbook)
  20.7.3. Discussion (Perl Cookbook)
URIs (universal resource identifiers): 12.10. Exporting in a Primarily OO Module (Learning Perl Objects, References and Modules)
URI::URL module: 12.10. Exporting in a Primarily OO Module (Learning Perl Objects, References and Modules)
url( )
  CGI.pm module: 10.7. CGI.pm Reference (Perl in a Nutshell)
  HTTP::Daemon module: 20.3.7. HTTP::Daemon (Perl in a Nutshell)
  HTTP::Request module: 20.3.1. HTTP::Request (Perl in a Nutshell)
url subroutine (URI::URL): 12.10. Exporting in a Primarily OO Module (Learning Perl Objects, References and Modules)
urlify program: 6.21. Program: urlify (Perl Cookbook)
urllist parameter, CPAN configuration table: 8.46.4. CD-ROM Support (Perl in a Nutshell)
URLs
  code in this book: 0.3. Code Examples (Learning Perl)
  CPAN: 1.3.1. What Is CPAN? (Learning Perl)
    B.4.3. Finding and Installing Modules (Learning Perl)
  Perl Monastery: 1.3.3. Are There Any Other Kinds of Support? (Learning Perl)
  search interfaces for Perl: 1.3.1. What Is CPAN? (Learning Perl)
URLs (uniform resource locators): 22.7.1. General Internet Methods (Perl in a Nutshell)
  encoding: 9.2. URL Encoding (Perl in a Nutshell)
  extra path information: 9.3. Extra Path Information (Perl in a Nutshell)
  URI::URL module: 20.1. LWP Overview (Perl in a Nutshell)
    20.5.3. URI::URL (Perl in a Nutshell)
use: 4.7. Global Declarations (Programming Perl)
  global and lexical scoping of: 4.8. Scoped Declarations (Programming Perl)
use attributes pragma: 6.5. Subroutine Attributes (Programming Perl)
use autouse pragma: 12.3.1. Problem (Perl Cookbook)
use base: 8.5. A Few Notes About @ISA (Learning Perl Objects, References and Modules)
use base declarations: 12.5.1. Inheritance Through @ISA (Programming Perl)
  pseudohash implementations, requirement with: 12.7.1. Field Declarations with use fields (Programming Perl)
use base pragma: 31.3. use base (Programming Perl)
use blib pragma: 31.4. use blib (Programming Perl)
use bytes pragma: 1.10.2. Solution (Perl Cookbook)
  15.2. Effects of Character Semantics (Programming Perl)
use CGI: 12.11. Custom Import Routines (Learning Perl Objects, References and Modules)
use charnames pragma: 1.5.3. Discussion (Perl Cookbook)
  15.2. Effects of Character Semantics (Programming Perl)
use command: 10. Packages (Programming Perl)
use constant pragma: 1.21.2. Solution (Perl Cookbook)
use declaration
  modules: 11.1. Using Modules (Programming Perl)
use declarations: 1.2.1.4. Simplicities (Programming Perl)
  4.7. Global Declarations (Programming Perl)
  4.9. Pragmas (Programming Perl)
  (see also pragmas)
  tie function and: 14. Tied Variables (Programming Perl)
  use strict: 24.1.2. Frequently Ignored Advice (Programming Perl)
use directives: B.4.3. Finding and Installing Modules (Learning Perl)
  7. Packages,Modules, and Objects (Perl in a Nutshell)
  7.2. Modules (Perl in a Nutshell)
  pragmas and: B.6. Pragmas (Learning Perl)
use fields declarations: 12.5.1. Inheritance Through @ISA (Programming Perl)
use fields pragma
  field declarations with: 12.7.1. Field Declarations with use fields (Programming Perl)
use filetest pragma: 3.10. Named Unary and File Test Operators (Programming Perl)
use lib: 12.7. Setting the Path at the Right Time (Learning Perl Objects, References and Modules)
  12.7. Setting the Path at the Right Time (Learning Perl Objects, References and Modules)
  13.10. Using the Alternate Library Location (Learning Perl Objects, References and Modules)
use lib pragma: 12.8.3. Discussion (Perl Cookbook)
use locale pragma: 6.12.2. Solution (Perl Cookbook)
use operation: 12.6. What use Is Doing (Learning Perl Objects, References and Modules)
  13.3. The Prototype Module Itself (Learning Perl Objects, References and Modules)
  14.3. Writing Tests with Test::More (Learning Perl Objects, References and Modules)
  14.3. Writing Tests with Test::More (Learning Perl Objects, References and Modules)
use operator: 10.. Introduction (Perl Cookbook)
use overload pragma: 13.14.1. Problem (Perl Cookbook)
  13.1. The overload Pragma (Programming Perl)
use pragmas: 6.12.2. Solution (Perl Cookbook)
  12.. Modules (Perl Cookbook)
  trapping errors in: 12.2.1. Problem (Perl Cookbook)
use statement: 21.1. How Perl Works (Programming Perl)
use strict: 8.1. If We Could Talk to the Animals... (Learning Perl Objects, References and Modules)
  8.5. A Few Notes About @ISA (Learning Perl Objects, References and Modules)
use strict pragma: 4.10. The use strict Pragma (Learning Perl)
  B.6.4. The strict Pragma (Learning Perl)
use subs declarations: 12.5.4. Method Autoloading (Programming Perl)
use utf8 pragma: 5.3.3. Wildcard Metasymbols (Programming Perl)
use warnings pragma: 20. The Perl Debugger (Programming Perl)
use_alarm( ) (LWP::UserAgent): 20.2.3. LWP::UserAgent (Perl in a Nutshell)
use_named_parameters( ) (CGI.pm): 10.7. CGI.pm Reference (Perl in a Nutshell)
Usenet news: 17. Usenet News (Perl in a Nutshell)
  messages: 18.4.1. Problem (Perl Cookbook)
  Net::News module: 17.2. Net::NNTP (Perl in a Nutshell)
  News::Newsrc module: 17.3. The News::Newsrc Module (Perl in a Nutshell)
  Perl-related: 1.4.1. The comp.lang.perl.* Newsgroups (Perl in a Nutshell)
  Perl modules for: 22.1. The CPAN modules Directory (Programming Perl)
use( ): 5. Function Reference (Perl in a Nutshell)
USER command (POP3): 16.1.3. Retrieving Email with Net::POP3 (Perl in a Nutshell)
User Datagram Protocol (see UDP)
user-defined functions (see subroutines)
user-defined subroutines: 1.2.2. Verbs (Programming Perl)
  1.2.2. Verbs (Programming Perl)
  (see also subroutines)
user efficiency, Perl programming: 24.2.6. User Efficiency (Programming Perl)
user functions (see subroutines)
User::grent module: 8.229. User::grent (Perl in a Nutshell)
user-ID, numeric ($uid): 11.6.1. The stat and lstat Functions (Learning Perl)
  changing file ownership and: 13.6. Changing Ownership (Learning Perl)
user-ID (uid): 11.6.1. The stat and lstat Functions (Learning Perl)
user interfaces: 15.. Introduction (Perl Cookbook)
  adding text to images: 15.20.1. Problem (Perl Cookbook)
  checking for waiting input: 15.9.1. Problem (Perl Cookbook)
  clearing the screen: 15.3.1. Problem (Perl Cookbook)
  controlling programs with Expect: 15.13.1. Problem (Perl Cookbook)
  determining window size: 15.4.1. Problem (Perl Cookbook)
  dialog boxes, creating with Tk: 15.15.1. Problem (Perl Cookbook)
  DOS shell window, removing: 15.17.1. Problem (Perl Cookbook)
  editing input: 15.11.1. Problem (Perl Cookbook)
  full-screen mode: 15.. Introduction (Perl Cookbook)
  graphing data: 15.18.1. Problem (Perl Cookbook)
    15.23. Program: graphbox (Perl Cookbook)
  managing screen: 15.12.1. Problem (Perl Cookbook)
  manipulating terminal directly: 15.8.1. Problem (Perl Cookbook)
  menus, creating with Tk: 15.14.1. Problem (Perl Cookbook)
  modules providing: 32.1.11. User Interfaces (Programming Perl)
  multiscreen CGI scripts: 19.11.1. Problem (Perl Cookbook)
  reading from keyboard: 15.6.1. Problem (Perl Cookbook)
  reading passwords without echo: 15.10.1. Problem (Perl Cookbook)
  ringing terminal bell: 15.7.1. Problem (Perl Cookbook)
  tcapdemo program: 15.21.1. Description (Perl Cookbook)
  testing programs if running interactively: 15.2.1. Problem (Perl Cookbook)
  text color: 15.5.1. Problem (Perl Cookbook)
  thumbnailing images: 15.19.1. Problem (Perl Cookbook)
  Tk resize events: 15.16.1. Problem (Perl Cookbook)
User::pwent module: 8.230. User::pwent (Perl in a Nutshell)
user_agent( ) (CGI.pm): 10.7. CGI.pm Reference (Perl in a Nutshell)
UserAgent object: 20.1. LWP Overview (Perl in a Nutshell)
  20.2. The LWP Modules (Perl in a Nutshell)
  20.2.3. LWP::UserAgent (Perl in a Nutshell)
UserAgent( ) (Win32::Internet): 22.7.1. General Internet Methods (Perl in a Nutshell)
UserCreate( ) (Win32::NetAdmin): 22.10. Win32::NetAdmin (Perl in a Nutshell)
User::grent module: 29.2.44. getgrent (Programming Perl)
  32.1.7. Operating System Interfaces (Programming Perl)
user_name( ) (CGI.pm): 10.7. CGI.pm Reference (Perl in a Nutshell)
username, passwd file entry from: 29.2.62. getpwnam (Programming Perl)
Username( ) (Win32::Internet): 22.7.1. General Internet Methods (Perl in a Nutshell)
User::pwent module: 4.16.3. Discussion (Perl Cookbook)
  29.2.63. getpwuid (Programming Perl)
  32.1.7. Operating System Interfaces (Programming Perl)
  Class::Struct, using to create objects and accessors: 32.6. Class::Struct (Programming Perl)
users
  authenticating, Perl modules for: 22.1. The CPAN modules Directory (Programming Perl)
  CPU times: 29.2.181. times (Programming Perl)
  fetching information on: 5.1. Perl Functions by Category (Perl in a Nutshell)
  granting limited privileges to: 23.1. Handling Insecure Data (Programming Perl)
  groups of: Glossary (Programming Perl)
    Glossary (Programming Perl)
    (see also GID, groups)
  information about, functions for getting: 29.1. Perl Functions by Category (Programming Perl)
userstats program: 14.1.3. Discussion (Perl Cookbook)
use_sleep( ) (LWP::RobotUA): 20.2.1. LWP::RobotUA Sections (Perl in a Nutshell)
usleep( ): 3.9.3. Discussion (Perl Cookbook)
/usr/bin/perl: 1.4.2. What's Inside That Program? (Learning Perl)
/usr/local/bin/perl: 1.4.2. What's Inside That Program? (Learning Perl)
utf8, globally switching interfaces to: 28.2. Special Variables in Alphabetical Order (Programming Perl)
UTF-8: 1.. Unicode Support in Perl (Perl Cookbook)
  8.20.3. Discussion (Perl Cookbook)
  2.1. Atoms (Programming Perl)
  characters, ,converting to integers: 15.2. Effects of Character Semantics (Programming Perl)
  variable-length character encoding: 15.1. Building Character (Programming Perl)
utf8 I/O layer: 8.. I/O Layers (Perl Cookbook)
utf8 module: 8.231. utf8 (Perl in a Nutshell)
  32.1.6. Internationalization and Locale (Programming Perl)
utf8 (Perl version): 15.1. Building Character (Programming Perl)
utf8 pragma: 15.2. Effects of Character Semantics (Programming Perl)
utf8 strings, converting to/from byte strings: 15.1. Building Character (Programming Perl)
utilities
  inside: B.4.3. Finding and Installing Modules (Learning Perl)
  perlbug: 1.3.4. What If I Find a Bug in Perl? (Learning Perl)
  Unix (see Unix, utilities for)
  which_dbm: 16.1. DBM Files and DBM Hashes (Learning Perl)
utime( ): 5. Function Reference (Perl in a Nutshell)
utime( ), timestamps: 9.1.2. Solution (Perl Cookbook)
utime function: 13.7. Changing Timestamps (Learning Perl)
  29.2.193. utime (Programming Perl)
utmp file (see /etc/utmp file)
UV (internal unsigned integer value): 21.2. Internal Data Types (Programming Perl)

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