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Index: U

• \U string escape: Controlling Case (Perl tutorial)
• \u escape: The s/// Operator (Substitution) (Developing Perl)
• -u file test operator: File Test Operators (Perl tutorial)
• -u (setuid) file test: Named Unary and File Test Operators (Developing Perl)
• -u switch, perl: Command-Line Options (Perl tutorial)
• u command (CPAN.pm): Reference: u (Perl tutorial)
• uc(): Controlling Case (Perl tutorial)
• • Reference: uc (Perl tutorial)
• uc function: uc (Developing Perl)
• uc operator: Effects of Character Semantics (Developing Perl)
• UCD-SNMP library: Using SNMP from Perl (Perl for System Administration)
• ucfirst(): Controlling Case (Perl tutorial)
• • Reference: ucfirst (Perl tutorial)
• ucfirst function: ucfirst (Developing Perl)
• • passing messages with: Message Passing (Developing Perl)
• UDP protocol: Setting Up a UDP Client (Perl tutorial)
• • Setting Up a UDP Server (Perl tutorial)
• UDP/IP (User Datagram Protocol): Networking Primer (Advanced Perl Developing)
• udpmsg program (example): Setting Up a UDP Server (Perl tutorial)
• udpqotd program (example): Setting Up a UDP Server (Perl tutorial)
• Uhler, Stephen: GUI Forms: The Easy Way (Advanced Perl Developing)
• $uid file statistic: stat (Developing Perl)
• $UID ($<) variable: Global Special Variables (Perl tutorial)
• uidl() (Net::POP3): Reference: uidl (Perl tutorial)
• umask(): Reference: umask (Perl tutorial)
• umask function: umask (Developing Perl)
• umask values: Opening a File (Perl tutorial)
• uname() (POSIX): Finding Your Own Name and Address (Perl tutorial)
• unary operators: Unary Operators (Perl tutorial)
• • Operators (Developing Perl)
  • Unary and Binary Operators (Developing Perl)
  • Unary and Binary Operators (Developing Perl)
  • arithmetic: Unary Arithmetic Operators (Developing Perl)
  • Boolean: Some File Test Operators (Developing Perl)
  • class handler, invoking: The overload Pragma (Developing Perl)
  • functions, behaving as: Terms and List Operators (Leftward) (Developing Perl)
  • ideographic: Ideographic Unary Operators (Developing Perl)
  • list operators, distinguishing from: Named Unary and File Test Operators (Developing Perl)
  • named: Filename Globbing Operator (Developing Perl)
  • • Terms and List Operators (Leftward) (Perl Developing)
    • Named Unary and File Test Operators (Developing Perl)
    • listing of: Named Unary and File Test Operators (Developing Perl)
  • prototyping functions as: Care with Prototypes (Developing Perl)
• unbuffered input/output: Introduction (Perl tutorial)
• • Flushing Output (Perl tutorial)
  • Introduction (Perl tutorial)
  • Reading from the Keyboard (Perl tutorial)
• uncompressing Perl source code: Installing on Unix (Perl tutorial)
• • Standard Perl distribution (Perl tutorial)
• uncontrol subroutine: Using POSIX termios (Perl tutorial)
• undef: Introduction (Perl tutorial)
• • Reference: undef (Perl tutorial)
  • Variables (Perl tutorial)
• undef function: Time Efficiency (Developing Perl)
• • List Assignment (Developing Perl)
  • undef (Developing Perl)
  • arrays, freeing memory from: Array Length (Developing Perl)
• undefined scalars: Scalar Values (Developing Perl)
• undefined subroutines, calling with AUTOLOAD: Autoloading (Developing Perl)
• undefined (undef) value: Introduction (Perl tutorial)
• undelete_message() (Mail::Folder): Reference: undelete_message (Perl tutorial)
• -underline option (widgets): Common Widget Configuration Options (Perl tutorial)
• Underscore module: Magically Banishing $_ (Developing Perl)
• undump program: Command-Line Options (Perl tutorial)
• unequal (see equality operators)
• unescape_from() (Mail::Internet): Reference: unescape_from (Perl tutorial)
• Unicode: Introduction (Perl tutorial)
• • Atoms (Developing Perl)
  • Unicode (Developing Perl)
  • case translation tables: Effects of Character Semantics (Developing Perl)
  • converting to characters: chr (Developing Perl)
  • editors for: Effects of Character Semantics (Developing Perl)
  • information about: Unicode Properties (Developing Perl)
  • line separator character: Molecules (Developing Perl)
  • locales and: lc (Developing Perl)
  • paragraph separator character: Molecules (Developing Perl)
  • Perl properties for: Character Classes (Developing Perl)
  • properties: Unicode Properties (Developing Perl)
  • • bidirectional rendering: Standard Unicode properties (Developing Perl)
    • block properties: Unicode block properties (Developing Perl)
    • decomposition of characters: Standard Unicode properties (Developing Perl)
    • Perl character class shortcuts and: Classic Perl Character Class Shortcuts (Developing Perl)
    • Perl composites: Perl's Unicode properties (Developing Perl)
    • standard: Standard Unicode properties (Developing Perl)
    • syllabaries, classifying by vowel sounds: Standard Unicode properties (Developing Perl)
  • properties database: Effects of Character Semantics (Developing Perl)
  • smiley face: chr (Developing Perl)
  • summary of, accessing: Effects of Character Semantics (Developing Perl)
  • support for, turning on: Internationalization and Locale (Developing Perl)
  • titlecase, converting strings to: The tr/// Operator (Transliteration) (Developing Perl)
  • Unicode Standard, Version 3.0: Effects of Character Semantics (Developing Perl)
  • use in Perl, caveats on: Caution, [ren2bold] Working (Developing Perl)
  • wildcard metasymbols, matching with: Wildcard Metasymbols (Developing Perl)
• Unicode characters: Regular Expressions (Developing Perl)
• • in identifiers: Names (Developing Perl)
  • smiley: String Literals (Developing Perl)
• unimport(): Program: psgrep (Perl tutorial)
• • Creating Magic Variables with tie (Perl tutorial)
• uninitialized, variables: Singularities (Developing Perl)
• unions of lists: Finding Elements in One Array but Not Another (Perl tutorial)
• unique list elements, extracting: Extracting Unique Elements from a List (Perl tutorial)
• unique_name() (Net::FTP): Reference: unique_name (Perl tutorial)
• uniqueness of objects: Uniqueness of Objects in Memory (Advanced Perl Developing)
• UNIVERSAL class: UNIVERSAL: The Ultimate Ancestor Class (Developing Perl)
• • methods, adding to: UNIVERSAL: The Ultimate Ancestor Class (Developing Perl)
• UNIVERSAL module: UNIVERSAL (Advanced Perl Developing)
• • Determining Subclass Membership (Perl tutorial)
  • UNIVERSAL (Perl tutorial)
  • Convenient Classes (Developing Perl)
• Universal Naming Convention (UNC): Microsoft Windows/2000 (Perl for System Administration)
• • account creation/deletion, programs for: Unix account creation and deletion routines (Perl for System Administration)
  • communicating with Microsoft SQL Server: Interacting with an SQL Server from Perl (Perl for System Administration)
  • directories, hidden: Local Signs of Peril (Perl for System Administration)
  • disk quotas on: Manipulating Disk Quotas (Perl for System Administration)
  • file operations on, tracking: Tracking Operations in Unix (Perl for System Administration)
  • filesystems
  • • /proc: Using the /proc Filesystem (Perl for System Administration)
    • querying usage on: Querying Filesystem Usage (Perl for System Administration)
    • traversing/walking: Walking or Traversing the Filesystem (Perl for System Administration)
  • group ID (GID): The Classic Unix Password File (Perl for System Administration)
  • host files
  • • generating: Generating Host Files (Perl for System Administration)
    • parsing: Host Files (Perl for System Administration)
    • source control systems: Incorporating a Source Code Control System (Perl for System Administration)
  • installing modules on: Installing Modules on Unix (Perl for System Administration)
  • • analyzing: Log Analysis (Perl for System Administration)
    • wtmp: Binary Log Files (Perl for System Administration)
  • network operations on, tracking: Tracking Operations in Unix (Perl for System Administration)
  • password file: The Classic Unix Password File (Perl for System Administration)
  • passwords: Unix account creation and deletion routines (Perl for System Administration)
  • privileges on, dropping: Drop Your Privileges as Soon as Possible (Perl for System Administration)
  • process control: Unix Process Control (Perl for System Administration)
  • process table, module for interface to: Using the Proc::ProcessTable Module (Perl for System Administration)
  • processes, listing: Unix Process Control (Perl for System Administration)
  • shells: The Classic Unix Password File (Perl for System Administration)
  • user identity: Unix User Identity (Perl for System Administration)
• • Singularities (Developing Perl)
  • #! (shebang) line: The Perl Interpreter (Perl tutorial)
  • command processing: Command Processing (Perl tutorial)
  • CPAN modules, installing on: Decompressing and Unpacking CPAN Modules (Developing Perl)
  • fileglobbing: Filenames, Filesystems, and File Locking (Developing Perl)
  • File::Spec::Unix module: Filenames, Filesystems, and File Locking (Developing Perl)
  • installing Perl on: Installing on Unix (Perl tutorial)
  • security bugs: Unix Kernel Security Bugs (Developing Perl)
  • sockets for: Networking and Interprocess Communication (Developing Perl)
• test command, test scripts and: How to Do It (Developing Perl)
• • truncating kernel interpretation of #! line: Command Processing (Developing Perl)
• Unix domain sockets: Introduction (Perl tutorial)
• • Using UNIX Domain Sockets (Perl tutorial)
  • Sockets (Perl tutorial)
• UnixDate(): Parsing Dates and Times from Strings (Perl tutorial)
• unless modifier: Simple Statements (Developing Perl)
• unless statement
• • Conditionals and Loops (Perl tutorial)
  • Modifiers (Perl tutorial)
• unless statements: The if and unless statements (Developing Perl)
• • if statements, using instead of: if and unless Statements (Developing Perl)
• unlink(): Deleting a File (Perl tutorial)
• • Removing a Directory and Its Contents (Perl tutorial)
  • Reference: unlink (Perl tutorial)
• unlink function: unlink (Developing Perl)
• • Boolean Context (Developing Perl)
• unmark() (News::Newsrc): Reference: unmark (Perl tutorial)
• unmark_list() (News::Newsrc): Reference: unmark_list (Perl tutorial)
• unmark_range() (News::Newsrc): Reference: unmark_range (Perl tutorial)
• unmarked_articles() (News::Newsrc): Reference: unmarked_articles (Perl tutorial)
• unordered lists (see hashes)
• unpack: Endianness and Number Width (Developing Perl)
• unpack function: unpack (Developing Perl)
• • template characters for: pack (Developing Perl)
• unpack() function (Perl): Using unpack( ) (Perl for System Administration)
• unpacking CPAN modules: Decompressing and Unpacking CPAN Modules (Developing Perl)
• unpack_sockaddr_in() (Socket): Reference: unpack_sockaddr_in (Perl tutorial)
• unpack_sockaddr_un() (Socket): Reference: unpack_sockaddr_un (Perl tutorial)
• unpacking Perl source code: Installing on Unix (Perl tutorial)
• • Standard Perl distribution (Perl tutorial)
• unpost() (Menu widget): Menu Methods (Perl tutorial)
• unqualified, names, searching for: Name Lookups (Developing Perl)
• unsafe operations: Command-Line Options (Perl tutorial)
• • Switches (Developing Perl)
• unshift()
• • Reference: unshift (Perl tutorial)
  • circular lists: Implementing a Circular List (Perl tutorial)
  • Tie::IxHash module and: Retrieving from a Hash in Insertion Order (Perl tutorial)
• unshift function: Data Structures (Developing Perl)
• • unshift (Developing Perl)
• unsigned integers, lists of, storing: vec (Developing Perl)
• unsigned shorts: sprintf (Developing Perl)
• Unsolicited Commercial Email (UCE) (see spam)
• unsub_groups() (News::Newsrc): Reference: unsub_groups (Perl tutorial)
• unsubscribe() (News::Newsrc): Reference: unsubscribe (Perl tutorial)
• untie(): Making and Using a DBM File (Perl tutorial)
• • Reference: untie (Perl tutorial)
• untie function: Tied Variables (Developing Perl)
• • Subtle Untying Trap (Developing Perl)
  • dbmclose (Developing Perl)
  • untie (Developing Perl)
  • outstanding references, not eliminating: Tying Scalars (Developing Perl)
• until loops: while and until Statements (Developing Perl)
• until modifier: Simple Statements (Developing Perl)
• until statement
• • while loops (Perl tutorial)
  • Modifiers (Perl tutorial)
• untying trap: Subtle Untying Trap (Developing Perl)
• up method: Semaphores (Developing Perl)
• upcase function: Tricks with Parameter Lists (Developing Perl)
• UPDATE command (SQL): Changing Table Information (Perl for System Administration)
• update_message() (Mail::Folder): Reference: update_message (Perl tutorial)
• uppercase, converting to: String Literals (Developing Perl)
• • The s/// Operator (Substitution) (Perl Developing)
• URI modules: The URI Module (Perl tutorial)
• • URI::Escape: The URI Module (Perl tutorial)
  • URI::Heuristic: Finding Stale Links (Perl tutorial)
  • • The URI Module (Perl tutorial)
  • URI::URL: URI::URL (Perl tutorial)
  • URI::URL module: LWP Overview (Perl tutorial)
• URIs (Universal Resource Identifiers): LWP Overview (Perl tutorial)
• url()
• • CGI.pm module: Reference: url (Perl tutorial)
  • HTTP::Daemon module: Reference: url (Perl tutorial)
  • HTTP::Request module: Reference: url (Perl tutorial)
• urlify program: Program: urlify (Perl tutorial)
• URLs (uniform resource locators): Introduction (Perl tutorial)
• • Reference: CanonicalizeURL (Perl tutorial)
  • encoding: URL Encoding (Perl tutorial)
  • extra path information: Extra Path Information (Perl tutorial)
  • extracting from HTML: Extracting URLs (Perl tutorial)
  • fetching from Perl scripts: Fetching a URL from a Perl Script (Perl tutorial)
  • putting HTML links around: Program: urlify (Perl tutorial)
  • redirecting CGI requests: Redirecting to a Different Location (Perl tutorial)
  • URI::URL module: LWP Overview (Perl tutorial)
  • • URI::URL (Perl tutorial)
• use(): Reference: use (Perl tutorial)
• use attributes pragma: Subroutine Attributes (Developing Perl)
• use base declarations: Inheritance Through @ISA (Developing Perl)
• • pseudohash implementations, requirement with: Field Declarations with use fields (Developing Perl)
• use base pragma: use base (Developing Perl)
• use blib pragma: use blib (Developing Perl)
• use bytes pragma: Effects of Character Semantics (Developing Perl)
• use charnames pragma: Effects of Character Semantics (Developing Perl)
• use command: Packages (Developing Perl)
• use declarations: Simplicities (Developing Perl)
• • Global Declarations (Developing Perl)
  • Pragmas (Developing Perl)
  • (see also pragmas)
  • tie function and: Tied Variables (Developing Perl)
  • use strict: Frequently Ignored Advice (Developing Perl)
• use declarations (pragmas): Packages and Files (Advanced Perl Developing)
• • Importing Symbols (Advanced Perl Developing)
  • Introduction (Perl tutorial)
  • Packages, Modules, and Objects (Perl tutorial)
  • Modules (Perl tutorial)
  • trapping errors in: Trapping Errors in require or use (Perl tutorial)
  • use autouse: Delaying use Until Run Time (Perl tutorial)
  • use English: Special Variables (Perl tutorial)
  • use integer: Arithmetic Operators (Perl tutorial)
  • use lib: Keeping Your Own Module Directory (Perl tutorial)
  • use locale: Controlling Case (Perl tutorial)
  • • Introduction (Perl tutorial)
    • Honoring Locale Settings in Regular Expressions (Perl tutorial)
  • use overload pragma: Overloading Operators (Perl tutorial)
  • use Socket: Initializing a Socket (Perl tutorial)
• use fields declarations: Inheritance Through @ISA (Developing Perl)
• use fields pragma:: Field Declarations with use fields (Developing Perl)
• use filetest pragma: Named Unary and File Test Operators (Developing Perl)
• use overload pragma: The overload Pragma (Developing Perl)
• use statement: How Perl Works (Developing Perl)
• USE statement (SQL): Creating /Deleting Databases and Tables (Perl for System Administration)
• • adding/removing
  • • API calls for: Windows/2000 account creation and deletion routines (Perl for System Administration)
    • modules for: Windows/2000 account creation and deletion routines (Perl for System Administration)
  • logins, security and: Finding Problematic Patterns (Perl for System Administration)
  • • process scripts for: The Process Scripts (Perl for System Administration)
    • with ADSI: Working with Users via ADSI (Perl for System Administration)
  • Unix: The Classic Unix Password File (Perl for System Administration)
  • Windows/2000: NT/2000 User ID Numbers (Perl for System Administration)
• use subs declarations: Method Autoloading (Developing Perl)
• use utf8 pragma: Wildcard Metasymbols (Developing Perl)
• use warnings pragma: The Perl Debugger (Developing Perl)
• use_alarm() (LWP::UserAgent): Reference: use_alarm (Perl tutorial)
• use_named_parameters() (CGI.pm): Reference: use_named_parameters (Perl tutorial)
• Usenet news: Reading and Posting Usenet News Messages (Perl tutorial)
• • Usenet News (Perl tutorial)
  • Net::News module: Net::NNTP (Perl tutorial)
  • News::Newsrc module: The News::Newsrc Module (Perl tutorial)
  • Perl-related newsgroups
  • • The comp.lang.perl.* Newsgroups (Perl tutorial)
• Usenet, Perl modules for: The CPAN modules Directory (Developing Perl)
• user()
• • Mail::Address module: Reference: user (Perl tutorial)
  • • Parse Email Addresses with Mail::Address (Perl tutorial)
  • Net::POP3 module: Reference: user (Perl tutorial)
  • • Retrieving Email with Net::POP3 (Perl tutorial)
  • URI::URL module: Reference: user (Perl tutorial)
• user-defined functions (see subroutines)
• user-defined structures: User-Defined Structures (Advanced Perl Developing)
• • matrices example: Example: Matrices (Advanced Perl Developing)
• user-defined subroutines: Verbs (Developing Perl)
• • Verbs (Developing Perl)
  • (see also subroutines)
• user efficiency, Perl developing: User Efficiency (Developing Perl)
• user input, security of: Be Careful When Reading Data (Perl for System Administration)
• user interfaces, modules providing: User Interfaces (Developing Perl)
• User() (Mail::POP3Client): Reference: User (Perl tutorial)
• User Security Model (USM): The Twenty-Minute SNMP Tutorial (Perl for System Administration)
• • identity of
  • • Unix: Unix User Identity (Perl for System Administration)
    • Windows/2000: NT/2000 User Identity Storage and Access (Perl for System Administration)
  • rights of, Windows/2000: NT/2000 User Rights (Perl for System Administration)
• user_agent() (CGI.pm): Reference: user_agent (Perl tutorial)
• USER command (POP3): Retrieving Email with Net::POP3 (Perl tutorial)
• UserAgent() (Win32::Internet): Reference: UserAgent (Perl tutorial)
• UserAgent object: LWP Overview (Perl tutorial)
• • The LWP Modules (Perl tutorial)
  • LWP::UserAgent (Perl tutorial)
• UserCreate() (Win32::NetAdmin): Reference: UserCreate (Perl tutorial)
• User::grent module: User::grent (Perl tutorial)
• • getgrent (Developing Perl)
  • Operating System Interfaces (Developing Perl)
• user_name() (CGI.pm): Reference: user_name (Perl tutorial)
• User::pwent module: User::pwent (Perl tutorial)
• • getpwuid (Developing Perl)
  • Operating System Interfaces (Developing Perl)
  • Class::Struct, using to create objects and accessors: Class::Struct (Developing Perl)
• username, passwd file entry from: getpwnam (Developing Perl)
• Username() (Win32::Internet): Reference: Username (Perl tutorial)
• users
• • authenticating, Perl modules for: The CPAN modules Directory (Developing Perl)
  • CPU times: times (Developing Perl)
  • fetching information on: Perl Functions by Category (Perl tutorial)
  • granting limited privileges to: Handling Insecure Data (Developing Perl)
• userstats program (example): Making and Using a DBM File (Perl tutorial)
• guts: Internals and Externals (Developing Perl)
• • • members, login names: Internals and Externals (Developing Perl)
• USM (User Security Model): The Twenty-Minute SNMP Tutorial (Perl for System Administration)
• UTF-8: Atoms (Developing Perl)
• characters,
• • globally switching interfaces to: Special Variables in Alphabetical Order (Developing Perl)
  • converting to integers: Effects of Character Semantics (Developing Perl)
• utime(): Getting and Setting Timestamps (Perl tutorial)
• • Reference: utime (Perl tutorial)
• utime function: utime (Developing Perl)
• utmp file (see /etc/utmp file)
• UV (internal unsigned integer value): Internal Data Types (Developing Perl)
• uvi program (example): Getting and Setting Timestamps (Perl tutorial)

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