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Index: U

• -u (dump core) command-line switch: Switches
• \u escape: The s/// Operator (Substitution)
• -u (setuid) file test: Named Unary and File Test Operators
• -U (unsafe) command-line switch: Switches
• uc function: uc
• uc operator: Effects of Character Semantics
• ucfirst function: ucfirst
• • Effects of Character Semantics
• • passing messages with: Message Passing
  • packets: Sockets
• $uid file statistic: stat
• UID (user ID): Special Variables in Alphabetical Order
• • chown
  • assumed: Talking to Yourself
  • passwd file entry from: getpwuid
• umask function: umask
• unary operators: Operators
• • Unary and Binary Operators
  • Unary and Binary Operators
  • arithmetic: Unary Arithmetic Operators
  • Boolean: Some File Test Operators
  • class handler, invoking: The overload Pragma
  • functions, behaving as: Terms and List Operators (Leftward)
  • ideographic: Ideographic Unary Operators
  • list operators, distinguishing from: Named Unary and File Test Operators
  • named: Filename Globbing Operator
  • • Terms and List Operators (Leftward)
    • Named Unary and File Test Operators
    • listing of: Named Unary and File Test Operators
  • prototyping functions as: Care with Prototypes
• undef function: Time Efficiency
• • List Assignment
  • undef
  • arrays, freeing memory from: Array Length
• undefined scalars: Scalar Values
• undefined subroutines, calling with AUTOLOAD: Autoloading
• Underscore module: Magically Banishing $_
• unequal (see equality operators)
• Unicode: Atoms
• • Unicode
  • case translation tables: Effects of Character Semantics
  • converting to characters: chr
  • editors for: Effects of Character Semantics
  • information about: Unicode Properties
  • line separator character: Molecules
  • locales and: lc
  • paragraph separator character: Molecules
  • Perl properties for: Character Classes
  • properties: Unicode Properties
  • • bidirectional rendering: Standard Unicode properties
    • block properties: Unicode block properties
    • decomposition of characters: Standard Unicode properties
    • Perl character class shortcuts and: Classic Perl Character Class Shortcuts
    • Perl composites: Perl's Unicode properties
    • standard: Standard Unicode properties
    • syllabaries, classifying by vowel sounds: Standard Unicode properties
  • properties database: Effects of Character Semantics
  • smiley face: chr
  • summary of, accessing: Effects of Character Semantics
  • support for, turning on: Internationalization and Locale
  • titlecase, converting strings to: The tr/// Operator (Transliteration)
  • Unicode Standard, Version 3.0: Effects of Character Semantics
  • use in Perl, caveats on: Caution, [ren2bold] Working
  • wildcard metasymbols, matching with: Wildcard Metasymbols
• Unicode characters: Regular Expressions
• • in identifiers: Names
  • smiley: String Literals
• uninitialized, variables: Singularities
• UNIVERSAL class: UNIVERSAL: The Ultimate Ancestor Class
• • methods, adding to: UNIVERSAL: The Ultimate Ancestor Class
• UNIVERSAL module: Convenient Classes
• • Singularities
  • CPAN modules, installing on: Decompressing and Unpacking CPAN Modules
  • fileglobbing: Filenames, Filesystems, and File Locking
  • File::Spec::Unix module: Filenames, Filesystems, and File Locking
  • security bugs: Unix Kernel Security Bugs
  • sockets for: Networking and Interprocess Communication
  • test command, test scripts and: How to Do It
  • truncating kernel interpretation of #! line: Command Processing
• unless modifier: Simple Statements
• unless statements: The if and unless statements
• • if statements, using instead of: if and unless Statements
• unlink function: unlink
• • Boolean Context
• unordered lists (see hashes)
• unpack: Endianness and Number Width
• unpack function: unpack
• • template characters for: pack
• unpacking CPAN modules: Decompressing and Unpacking CPAN Modules
• unqualified, names, searching for: Name Lookups
• unsafe operations: Switches
• unshift function: Data Structures
• • unshift
• unsigned integers, lists of, storing: vec
• unsigned shorts: sprintf
• untie function: Tied Variables
• • Subtle Untying Trap
  • dbmclose
  • untie
  • outstanding references, not eliminating: Tying Scalars
• until loops: while and until Statements
• until modifier: Simple Statements
• untying trap: Subtle Untying Trap
• up method: Semaphores
• upcase function: Tricks with Parameter Lists
• uppercase, converting to: String Literals
• • The s/// Operator (Substitution)
• use: Global Declarations
• • global and lexical scoping of: Scoped Declarations
• use attributes pragma: Subroutine Attributes
• use base declarations: Inheritance Through @ISA
• • pseudohash implementations, requirement with: Field Declarations with use fields
• use base pragma: use base
• use blib pragma: use blib
• use bytes pragma: Effects of Character Semantics
• use charnames pragma: Effects of Character Semantics
• use command: Packages
• use declarations: Simplicities
• • Global Declarations
  • Pragmas
  • (see also pragmas)
  • modules: Using Modules
  • tie function and: Tied Variables
  • use strict: Frequently Ignored Advice
• use fields declarations: Inheritance Through @ISA
• use fields pragma: Field Declarations with use fields
• use filetest pragma: Named Unary and File Test Operators
• use overload pragma: The overload Pragma
• use statement: How Perl Works
• use subs declarations: Method Autoloading
• use utf8 pragma: Wildcard Metasymbols
• use warnings pragma: The Perl Debugger
• Usenet, Perl modules for: The CPAN modules Directory
• user-defined functions (see subroutines)
• user-defined subroutines: Verbs
• • Verbs
  • (see also subroutines)
• user efficiency, Perl developing: User Efficiency
• user ID (see UID)
• user interfaces, modules providing: User Interfaces
• User::grent module: getgrent
• • Operating System Interfaces
• username, passwd file entry from: getpwnam
• User::pwent module: getpwuid
• • Operating System Interfaces
  • Class::Struct, using to create objects and accessors: Class::Struct
• users
• • authenticating, Perl modules for: The CPAN modules Directory
  • CPU times: times
  • granting limited privileges to: Handling Insecure Data
  • information about, functions for getting: Perl Functions by Category
• UTF-8: Atoms
• • characters, converting to integers: Effects of Character Semantics
  • globally switching interfaces to: Special Variables in Alphabetical Order
  • module: Internationalization and Locale
  • Perl version: Building Character
  • pragma: Effects of Character Semantics
  • strings, converting to/from byte strings: Building Character
  • variable-length character encoding: Building Character
• utime function: utime
• utmp file (see /etc/utmp file)
• UV (internal unsigned integer value): Internal Data Types

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