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Index: U
- -u (dump core) command-line switch: 19.1.3. Switches
- u escape: 5.2.3. The s/// Operator (Substitution)
- -u (setuid) file test: 3.10. Named Unary and File Test Operators
- -U (unsafe) command-line switch: 19.1.3. Switches
- uc function: 29.2.184. uc
- uc operator: 15.2. Effects of Character Semantics
- ucfirst function: 29.2.185. ucfirst
- $uid file statistic: 29.2.165. stat
- UID (user ID): 28.2. Special Variables in Alphabetical Order
- umask function: 29.2.186. umask
- unary operators: 1.5. Operators
- 3. Unary and Binary Operators
- 3. Unary and Binary Operators
- arithmetic: 1.5.4. Unary Arithmetic Operators
- Boolean: 1.5.7. Some File Test Operators
- class handler, invoking: 13.1. The overload Pragma
- functions, behaving as: 3.1. Terms and List Operators (Leftward)
- ideographic: 3.5. Ideographic Unary Operators
- list operators, distinguishing from: 3.10. Named Unary and File Test Operators
- named: 2.11.3. Filename Globbing Operator
- prototyping functions as: 6.4.2. Care with Prototypes
- undef function: 24.2.1. Time Efficiency
- undefined scalars: 2.6. Scalar Values
- undefined subroutines, calling with AUTOLOAD: 10.2. Autoloading
- Underscore module: 14.1.3. Magically Banishing $_
- unequal (see equality operators)
- Unicode: 2.1. Atoms
- 15. Unicode
- case translation tables: 15.2. Effects of Character Semantics
- converting to characters: 29.2.14. chr
- editors for: 15.2. Effects of Character Semantics
- information about: 5.4.3. Unicode Properties
- line separator character: 2.2. Molecules
- locales and: 29.2.82. lc
- paragraph separator character: 2.2. Molecules
- Perl properties for: 5.4. Character Classes
- properties: 5.4.3. Unicode Properties
- bidirectional rendering: 5.4.3.2. Standard Unicode properties
- block properties: 5.4.3.3. Unicode block properties
- decomposition of characters: 5.4.3.2. Standard Unicode properties
- Perl character class shortcuts and: 5.4.2. Classic Perl Character Class Shortcuts
- Perl composites: 5.4.3.1. Perl's Unicode properties
- standard: 5.4.3.2. Standard Unicode properties
- syllabaries, classifying by vowel sounds: 5.4.3.2. Standard Unicode properties
- properties database: 15.2. Effects of Character Semantics
- smiley face: 29.2.14. chr
- summary of, accessing: 15.2. Effects of Character Semantics
- support for, turning on: 32.1.6. Internationalization and Locale
- titlecase, converting strings to: 5.2.4. The tr/// Operator (Transliteration)
- Unicode Standard, Version 3.0: 15.2. Effects of Character Semantics
- use in Perl, caveats on: 15.3. Caution, [ren2bold] Working
- wildcard metasymbols, matching with: 5.3.3. Wildcard Metasymbols
- Unicode characters: 1.7. Regular Expressions
- uninitialized, variables: 1.2.1.1. Singularities
- UNIVERSAL class: 12.5.3. UNIVERSAL: The Ultimate Ancestor Class
- UNIVERSAL module: 32.1.14. Convenient Classes
- 1.2.1.1. Singularities
- CPAN modules, installing on: 22.2.1. Decompressing and Unpacking CPAN Modules
- fileglobbing: 32.1.4. Filenames, Filesystems, and File Locking
- File::Spec::Unix module: 32.1.4. Filenames, Filesystems, and File Locking
- security bugs: 23.2.1. Unix Kernel Security Bugs
- sockets for: 32.1.8. Networking and Interprocess Communication
- test command, test scripts and: 1.3.1. How to Do It
- truncating kernel interpretation of #! line: 19.1. Command Processing
- unless modifier: 4.1. Simple Statements
- unless statements: 1.6.1.1. The if and unless statements
- unlink function: 29.2.188. unlink
- unordered lists (see hashes)
- unpack: 25.2. Endianness and Number Width
- unpack function: 29.2.189. unpack
- unpacking CPAN modules: 22.2.1. Decompressing and Unpacking CPAN Modules
- unqualified, names, searching for: 2.5.1. Name Lookups
- unsafe operations: 19.1.3. Switches
- unshift function: 9. Data Structures
- unsigned integers, lists of, storing: 29.2.195. vec
- unsigned shorts: 29.2.162. sprintf
- untie function: 14. Tied Variables
- until loops: 4.4.1. while and until Statements
- until modifier: 4.1. Simple Statements
- untying trap: 14.5. A Subtle Untying Trap
- up method: 17.2.3.2. Semaphores
- upcase function: 6.2.1. Tricks with Parameter Lists
- uppercase, converting to: 2.6.2. String Literals
- use: 4.7. Global Declarations
- use attributes pragma: 6.5. Subroutine Attributes
- use base declarations: 12.5.1. Inheritance Through @ISA
- use base pragma: 31.3. use base
- use blib pragma: 31.4. use blib
- use bytes pragma: 15.2. Effects of Character Semantics
- use charnames pragma: 15.2. Effects of Character Semantics
- use command: 10. Packages
- use declarations: 1.2.1.4. Simplicities
- use fields declarations: 12.5.1. Inheritance Through @ISA
- use fields pragma: 12.7.1. Field Declarations with use fields
- use filetest pragma: 3.10. Named Unary and File Test Operators
- use overload pragma: 13.1. The overload Pragma
- use statement: 21.1. How Perl Works
- use subs declarations: 12.5.4. Method Autoloading
- use utf8 pragma: 5.3.3. Wildcard Metasymbols
- use warnings pragma: 20. The Perl Debugger
- Usenet, Perl modules for: 22.1. The CPAN modules Directory
- user-defined functions (see subroutines)
- user-defined subroutines: 1.2.2. Verbs
- 1.2.2. Verbs
- (see also subroutines)
- user efficiency, Perl programming: 24.2.6. User Efficiency
- user ID (see UID)
- user interfaces, modules providing: 32.1.11. User Interfaces
- User::grent module: 29.2.44. getgrent
- username, passwd file entry from: 29.2.62. getpwnam
- User::pwent module: 29.2.63. getpwuid
- users
- UTF-8: 2.1. Atoms
- characters, converting to integers: 15.2. Effects of Character Semantics
- globally switching interfaces to: 28.2. Special Variables in Alphabetical Order
- module: 32.1.6. Internationalization and Locale
- Perl version: 15.1. Building Character
- pragma: 15.2. Effects of Character Semantics
- strings, converting to/from byte strings: 15.1. Building Character
- variable-length character encoding: 15.1. Building Character
- utime function: 29.2.193. utime
- utmp file (see /etc/utmp file)
- UV (internal unsigned integer value): 21.2. Internal Data Types
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