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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
15.2. Effects of Character Semantics
passing messages with: 16.5.3. Message Passing
packets: 16.5. Sockets
$uid file statistic: 29.2.165. stat
UID (user ID): 28.2. Special Variables in Alphabetical Order
29.2.13. chown
assumed: 16.3.2. Talking to Yourself
passwd file entry from: 29.2.63. getpwuid
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
3.1. Terms and List Operators (Leftward)
3.10. Named Unary and File Test Operators
listing of: 3.10. Named Unary and File Test Operators
prototyping functions as: 6.4.2. Care with Prototypes
undef function: 24.2.1. Time Efficiency
2.8.1. List Assignment
29.2.187. undef
arrays, freeing memory from: 2.8.2. Array Length
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
in identifiers: 2.5. Names
smiley: 2.6.2. String Literals
uninitialized, variables: 1.2.1.1. Singularities
UNIVERSAL class: 12.5.3. UNIVERSAL: The Ultimate Ancestor Class
methods, adding to: 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
if statements, using instead of: 4.3. if and unless Statements
unlink function: 29.2.188. unlink
2.7.2. Boolean Context
unordered lists (see hashes)
unpack: 25.2. Endianness and Number Width
unpack function: 29.2.189. unpack
template characters for: 29.2.108. pack
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
29.2.190. unshift
unsigned integers, lists of, storing: 29.2.195. vec
unsigned shorts: 29.2.162. sprintf
untie function: 14. Tied Variables
14.5. A Subtle Untying Trap
29.2.21. dbmclose
29.2.191. untie
outstanding references, not eliminating: 14.1. Tying Scalars
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
5.2.3. The s/// Operator (Substitution)
use: 4.7. Global Declarations
global and lexical scoping of: 4.8. Scoped Declarations
use attributes pragma: 6.5. Subroutine Attributes
use base declarations: 12.5.1. Inheritance Through @ISA
pseudohash implementations, requirement with: 12.7.1. Field Declarations with use fields
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
4.7. Global Declarations
4.9. Pragmas
(see also pragmas)
modules: 11.1. Using Modules
tie function and: 14. Tied Variables
use strict: 24.1.2. Frequently Ignored Advice
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
32.1.7. Operating System Interfaces
username, passwd file entry from: 29.2.62. getpwnam
User::pwent module: 29.2.63. getpwuid
32.1.7. Operating System Interfaces
Class::Struct, using to create objects and accessors: 32.6. Class::Struct
users
authenticating, Perl modules for: 22.1. The CPAN modules Directory
CPU times: 29.2.181. times
granting limited privileges to: 23.1. Handling Insecure Data
information about, functions for getting: 29.1. Perl Functions by Category
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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