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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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