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Index: U

• command (CPAN.pm) : Perl tutorial, Chapter 2, Reference: u
• -u file test operator
• • Learning Perl, 10.5. The -x File Tests
  • Perl tutorial, 4.5.8. File Test Operators
  • Perl Developing, 2.5.10. Named Unary and File Test Operators
• -u option (dprofpp) : Perl tutorial, 6.5. The Perl Profiler
• -U option (dprofpp) : Perl tutorial, 6.5. The Perl Profiler
• string escape : Perl tutorial, 1.9. Controlling Case
• string escape : Perl tutorial, 1.9. Controlling Case
• -u switch, perl
• • Perl tutorial, 3.2. Command-Line Options
  • Perl Developing, 6.1.2. Switches
• -U switch, perl
• • Perl tutorial, 3.2. Command-Line Options
  • Perl Developing, 6.1.2. Switches
• uc()
• • Perl tutorial, 1.9. Controlling Case
  • Perl tutorial, Chapter 5, Reference: uc
  • Perl Developing, 3.2.177. uc
• ucfirst()
• • Perl tutorial, 1.9. Controlling Case
  • Perl tutorial, Chapter 5, Reference: ucfirst
  • Perl Developing, 3.2.178. ucfirst
• UDP protocol
• • Perl tutorial, 17.4. Setting Up a UDP Client
  • Perl tutorial, 17.5. Setting Up a UDP Server
  • Perl Developing, 6.2.4.3. UDP: message passing
• UDP/IP (User Datagram Protocol) : Advanced Perl Developing, 12.1. Networking Primer
• udpmsg program (example) : Perl tutorial, 17.5. Setting Up a UDP Server
• udpqotd program (example) : Perl tutorial, 17.5. Setting Up a UDP Server
• Uhler, Stephen : Advanced Perl Developing, 14.2.1. GUI Forms: The Easy Way
• uid (user ID)
• • (see also $ variables, $; $ variables, $> variable)
  • Learning Perl, 10.6. The stat and lstat Functions
  • Perl Developing, 2.9.3. Global Special Variables
  • Perl Developing, 3.2.15. chown
  • accessing information : Learning Perl, 16.1. Getting Password and Group Information
  • assumed : Perl Developing, 6.2.2.2. Talking to yourself
  • passwd file entry from : Perl Developing, 3.2.63. getpwuid
• $uid file statistic : Perl Developing, 3.2.159. stat
• $UID ($<) variable
• • Perl tutorial, 4.4.1. Global Special Variables
  • Perl Developing, 2.9.3. Global Special Variables
  • Perl Developing, 7.2.13. English - Use English or awk Names for Punctuation Variables
• uidl() (Net::POP3) : Perl tutorial, Chapter 14, Reference: uidl
• umask()
• • Perl tutorial, Chapter 5, Reference: umask
  • Perl Developing, 3.2.179. umask
• umask values : Perl tutorial, 7.1. Opening a File
• uname() (POSIX) : Perl tutorial, 17.8. Finding Your Own Name and Address
• unary operators
• • Perl tutorial, 4.5.2. Unary Operators
  • Perl Developing, 7.2.48.2. Calling conventions for unary operations
  • Perl Developing, 7.2.48.3. Overloadable operations
  • arithmetic : Perl Developing, 1.5.4. Autoincrement and Autodecrement Operators
  • glob operator as : Perl Developing, 2.3.7.3. Filename globbing operator
  • ideographic : Perl Developing, 2.5.5. Ideographic Unary Operators
  • named
  • • Perl Developing, 2.3.7.3. Filename globbing operator
    • Perl Developing, 2.5.10. Named Unary and File Test Operators
• unbuffered input/output
• • Perl tutorial, 7.0. Introduction
  • Perl tutorial, 7.12. Flushing Output
  • Perl tutorial, 8.0. Introduction
  • Perl tutorial, 15.6. Reading from the Keyboard
  • Perl Developing, 3.2.43. getc
• UNC path : Learning Perl on Win32 Systems, 10.3. Using Pathnames and Filenames
• uncompressing Perl source code
• • Perl tutorial, 2.3.1. Installing on Unix
  • Perl tutorial, 2.3.2.2. Standard Perl distribution
• uncontrol subroutine : Perl tutorial, 15.8. Using POSIX termios
• undef
• • Perl tutorial, 11.0. Introduction
  • Learning Perl on Win32 Systems, 2.9. The Undefined Value
  • Perl tutorial, Chapter 5, Reference: undef
  • Perl tutorial, 4.2.4. Variables
  • Perl Developing, 3.2.25. defined
  • Perl Developing, 3.2.180. undef
  • Perl Developing, 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 tutorial, 1.0. Introduction
• undefined scalars : Perl Developing, 2.3.2. Scalar Values
• • Boolean context and : Perl Developing, 2.3.3.2. Boolean context
• undelete_message() (Mail::Folder) : Perl tutorial, Chapter 14, Reference: undelete_message
• -underline option (widgets) : Perl tutorial, 18.3. Common Widget Configuration Options
• underscore : (see _ (underscore))
• undump program : Perl tutorial, 3.2. Command-Line Options
• unequal : (see equality operators; relational operators)
• unescape_from() (Mail::Internet) : Perl tutorial, Chapter 14, Reference: unescape_from
• Unicode : Perl tutorial, 1.0. Introduction
• unimport()
• • Perl tutorial, 1.18. Program: psgrep
  • Perl tutorial, 13.15. Creating Magic Variables with tie
• uninitialized variables : Perl Developing, 1.2.1.1. Singularities
• uninstall() : Perl Developing, 7.2.16. ExtUtils::Install - Install Files from Here to There
• unions of lists : Perl tutorial, 4.7. Finding Elements in One Array but Not Another
• unique list elements, extracting : Perl tutorial, 4.6. Extracting Unique Elements from a List
• unique_name() (Net::FTP) : Perl tutorial, Chapter 16, Reference: unique_name
• uniqueness of objects : Advanced Perl Developing, 11.2.8. Uniqueness of Objects in Memory
• UNIVERSAL module
• • Advanced Perl Developing, 7.3. UNIVERSAL
  • Perl tutorial, 13.8. Determining Subclass Membership
  • Perl tutorial, 8.163. UNIVERSAL
  • Perl Developing, 5.3.4. A Class Is Simply a Package
• Unix
• • #! (shebang) line : Perl tutorial, 3. The Perl Interpreter
  • clients/servers : Perl Developing, 6.2.4.2. UNIX-domain clients and servers
  • command processing : Perl tutorial, 3.1. Command Processing
  • installing Perl on : Perl tutorial, 2.3.1. Installing on Unix
  • security bugs : Perl Developing, 6.3.1.3. Security bugs
• Unix domain sockets
• • Perl tutorial, 17.0. Introduction
  • Perl tutorial, 17.6. Using UNIX Domain Sockets
  • Perl tutorial, 13. Sockets
• UnixDate() : Perl tutorial, 3.7. Parsing Dates and Times from Strings
• unless statement
• • (see if statement)
  • Learning Perl on Win32 Systems, 9.5. Expression Modifiers
  • Perl tutorial, 4.3.1. Conditionals and Loops
  • Perl tutorial, 4.3.1.4. Modifiers
  • example of : Learning Perl on Win32 Systems, 10.4. A Slight Diversion: die
• unlink()
• • Perl tutorial, 9.2. Deleting a File
  • Perl tutorial, 9.8. Removing a Directory and Its Contents
  • Learning Perl, 13.1. Removing a File
  • Perl tutorial, Chapter 5, Reference: unlink
  • Perl Developing, 3.2.181. unlink
  • examples of : Learning Perl, A.12. Chapter 13, File and Directory Manipulation
• unlinking : (see deleting)
• unmark() (News::Newsrc) : Perl tutorial, Chapter 15, Reference: unmark
• unmark_list() (News::Newsrc) : Perl tutorial, Chapter 15, Reference: unmark_list
• unmark_range() (News::Newsrc) : Perl tutorial, Chapter 15, Reference: unmark_range
• unmarked_articles() (News::Newsrc) : Perl tutorial, Chapter 15, Reference: unmarked_articles
• unordered lists : (see hashes (associative arrays))
• unpack()
• • Perl tutorial, 1.1. Accessing Substrings
  • Perl tutorial, 1.4. Converting Between ASCII Characters and Values
  • Perl tutorial, 8.15. Reading Fixed-Length Records
  • Learning Perl, 16.2. Packing and Unpacking Binary Data
  • Perl tutorial, Chapter 5, Reference: unpack
  • Perl Developing, 3.2.182. unpack
  • converting binary and decimal numbers : Perl tutorial, 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 tutorial, Chapter 13, Reference: unpack_sockaddr_in
• unpack_sockaddr_un() (Socket) : Perl tutorial, Chapter 13, Reference: unpack_sockaddr_un
• unpacking Perl source code
• • Perl tutorial, 2.3.1. Installing on Unix
  • Perl tutorial, 2.3.2.2. Standard Perl distribution
• unpost() (Menu widget) : Perl tutorial, 18.15.2. Menu Methods
• unsafe operations
• • Perl tutorial, 3.2. Command-Line Options
  • Perl Developing, 6.1.2. Switches
• unshift()
• • Learning Perl, 3.4.4. The shift and unshift Functions
  • Perl tutorial, Chapter 5, Reference: unshift
  • Perl Developing, 3.2.183. unshift
  • circular lists : Perl tutorial, 4.16. Implementing a Circular List
  • Tie::IxHash module and : Perl tutorial, 5.6. Retrieving from a Hash in Insertion Order
• unsub_groups() (News::Newsrc) : Perl tutorial, Chapter 15, Reference: unsub_groups
• unsubscribe() (News::Newsrc) : Perl tutorial, Chapter 15, Reference: unsubscribe
• untie()
• • Perl tutorial, 14.1. Making and Using a DBM File
  • Perl tutorial, Chapter 5, Reference: untie
  • Perl Developing, 3.2.23. dbmclose
  • Perl Developing, 3.2.184. untie
  • Perl Developing, 5.4. Using Tied Variables
• until statement
• • (see while loops)
  • Learning Perl on Win32 Systems, 9.5. Expression Modifiers
  • Perl tutorial, 4.3.1.1. while loops
  • Perl tutorial, 4.3.1.4. Modifiers
• up-arrow, in regular expressions : Learning Perl, 7.3.1. Single-Character Patterns
• update_message() (Mail::Folder) : Perl tutorial, Chapter 14, Reference: update_message
• uppercase : (see case/capitalization)
• URI modules : Perl tutorial, 17.5. The URI Module
• • URI::Escape : Perl tutorial, 17.5. The URI Module
  • URI::Heuristic
  • • Perl tutorial, 20.7. Finding Stale Links
    • Perl tutorial, 17.5. The URI Module
  • URI::URL : Perl tutorial, 17.5.2. URI::URL
  • URI::URL module : Perl tutorial, 17.1. LWP Overview
• URIs (Universal Resource Identifiers) : Perl tutorial, 17.1. LWP Overview
• url()
• • CGI.pm module : Perl tutorial, Chapter 10, Reference: url
  • HTTP::Daemon module : Perl tutorial, Chapter 17, Reference: url
  • HTTP::Request module : Perl tutorial, Chapter 17, Reference: url
• urlify program : Perl tutorial, 6.21. Program: urlify
• URLs (uniform resource locators)
• • (see also Win32 modules, Win32::Internet module)
  • Perl tutorial, 19.0. Introduction
  • Learning Perl, 19. CGI Developing
  • Perl tutorial, Chapter 19, Reference: CanonicalizeURL
  • encoding : Perl tutorial, 9.2. URL Encoding
  • extra path information : Perl tutorial, 9.3. Extra Path Information
  • extracting from HTML : Perl tutorial, 20.3. Extracting URLs
  • fetching from Perl scripts : Perl tutorial, 20.1. Fetching a URL from a Perl Script
  • putting HTML links around : Perl tutorial, 6.21. Program: urlify
  • redirecting CGI requests : Perl tutorial, 19.8. Redirecting to a Different Location
  • URI::URL module
  • • Perl tutorial, 17.1. LWP Overview
    • Perl tutorial, 17.5.2. URI::URL
• use declarations (pragmas)
• • (see also pragmas)
  • Advanced Perl Developing, 6.2. Packages and Files
  • Advanced Perl Developing, 6.5. Importing Symbols
  • Perl tutorial, 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 tutorial, 7. Packages, Modules, and Objects
  • Perl tutorial, 7.2. Modules
  • trapping errors in : Perl tutorial, 12.2. Trapping Errors in require or use
  • use autouse : Perl tutorial, 12.3. Delaying use Until Run Time
  • use English : Perl tutorial, 4.4. Special Variables
  • use integer : Perl tutorial, 4.5.3. Arithmetic Operators
  • use lib : Perl tutorial, 12.7. Keeping Your Own Module Directory
  • use locale
  • • Perl tutorial, 1.9. Controlling Case
    • Perl tutorial, 6.0. Introduction
    • Perl tutorial, 6.12. Honoring Locale Settings in Regular Expressions
  • use overload pragma : Perl tutorial, 13.14. Overloading Operators
  • use Socket : Perl tutorial, 13.1.1. Initializing a Socket
  • use strict : Perl Developing, 8.2.2. Frequently Ignored Advice
  • use vars : Perl Developing, 7.2.2. AutoLoader - Load Functions Only on Demand
• use_alarm() (LWP::UserAgent) : Perl tutorial, Chapter 17, Reference: use_alarm
• use_named_parameters() (CGI.pm) : Perl tutorial, Chapter 10, Reference: use_named_parameters
• Usenet news
• • Perl tutorial, 18.4. Reading and Posting Usenet News Messages
  • Perl tutorial, 15. Usenet News
  • Net::News module : Perl tutorial, 15.2. Net::NNTP
  • News::Newsrc module : Perl tutorial, 15.3. The News::Newsrc Module
  • Perl-related newsgroups
  • • Learning Perl, Support
    • Perl tutorial, 1.4.1. The comp.lang.perl.* Newsgroups
• use() : Perl tutorial, Chapter 5, Reference: use
• user()
• • Mail::Address module
  • • Perl tutorial, Chapter 14, Reference: user
    • Perl tutorial, 14.2.6. Parse Email Addresses with Mail::Address
  • Net::POP3 module
  • • Perl tutorial, Chapter 14, Reference: user
    • Perl tutorial, 14.1.3. Retrieving Email with Net::POP3
  • URI::URL module : Perl tutorial, Chapter 17, Reference: user
• User() (Mail::POP3Client) : Perl tutorial, Chapter 14, Reference: User
• user_agent() (CGI.pm) : Perl tutorial, Chapter 10, Reference: user_agent
• USER command (POP3) : Perl tutorial, 14.1.3. Retrieving Email with Net::POP3
• user-defined functions : (see subroutines)
• user-defined structures : Advanced Perl Developing, 2.1. User-Defined Structures
• • matrices example : Advanced Perl Developing, 2.2. Example: Matrices
• user efficiency : Perl Developing, 8.3.6. User Efficiency
• user function : (see subroutines)
• User::grent module : Perl tutorial, 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 tutorial, Chapter 10, Reference: user_name
• User::pwent module : Perl tutorial, 8.165. User::pwent
• UserAgent() (Win32::Internet) : Perl tutorial, Chapter 19, Reference: UserAgent
• UserAgent object
• • Perl tutorial, 17.1. LWP Overview
  • Perl tutorial, 17.2. The LWP Modules
  • Perl tutorial, 17.2.3. LWP::UserAgent
• UserCreate() (Win32::NetAdmin) : Perl tutorial, Chapter 19, Reference: UserCreate
• Username() (Win32::Internet) : Perl tutorial, Chapter 19, Reference: Username
• usernames
• • Learning Perl, 16.1. Getting Password and Group Information
  • Perl Developing, 3.2.62. getpwnam
• users
• • fetching information on : Perl tutorial, 5.1. Perl Functions by Category
  • user CPU time
  • • Perl Developing, 3.2.174. times
    • Perl Developing, 7.2.4.1. Notes
• userstats program (example) : Perl tutorial, 14.1. Making and Using a DBM File
• "uses" relationship : Perl Developing, 5.5.7. Implementation (the "Uses" Relationship)
• /usr/dict/words : Learning Perl, 7.7. Exercises
• utime()
• • Perl tutorial, 9.1. Getting and Setting Timestamps
  • Learning Perl, 13.7. Modifying Timestamps
  • Learning Perl on Win32 Systems, 13.5. Modifying Timestamps
  • Perl tutorial, Chapter 5, Reference: utime
  • Perl Developing, 3.2.186. utime
• utmp file : (see /etc/utmp file)
• UUCP : Learning Perl, UUCP
• uvi program (example) : Perl tutorial, 9.1. Getting and Setting Timestamps

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