Book Home

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Index: U

\U string escape: 1.9. Controlling Case (Perl Cookbook)

\u escape: 5.2.3. The s/// Operator (Substitution) (Programming Perl)

-u file test operator: 4.5.8. File Test Operators (Perl in a Nutshell)

-u (setuid) file test: 3.10. Named Unary and File Test Operators (Programming Perl)

-u switch, perl: 3.2. Command-Line Options (Perl in a Nutshell)

u command (CPAN.pm): Chapter 2, Reference: u (Perl in a Nutshell)

uc(): 1.9. Controlling Case (Perl Cookbook)

Chapter 5, Reference: uc (Perl in a Nutshell)

uc function: 29.2.184. uc (Programming Perl)

uc operator: 15.2. Effects of Character Semantics (Programming Perl)

UCD-SNMP library: 10.3.1. Using SNMP from Perl (Perl for System Administration)

ucfirst(): 1.9. Controlling Case (Perl Cookbook)

Chapter 5, Reference: ucfirst (Perl in a Nutshell)

ucfirst function: 29.2.185. ucfirst (Programming Perl)

passing messages with: 16.5.3. Message Passing (Programming Perl)

UDP protocol: 17.4. Setting Up a UDP Client (Perl Cookbook)

17.5. Setting Up a UDP Server (Perl Cookbook)

UDP/IP (User Datagram Protocol): 12.1. Networking Primer (Advanced Perl Programming)

udpmsg program (example): 17.5. Setting Up a UDP Server (Perl Cookbook)

udpqotd program (example): 17.5. Setting Up a UDP Server (Perl Cookbook)

Uhler, Stephen: 14.2.1. GUI Forms: The Easy Way (Advanced Perl Programming)

$uid file statistic: 29.2.165. stat (Programming Perl)

$UID ($<) variable: 4.4.1. Global Special Variables (Perl in a Nutshell)

uidl() (Net::POP3): Chapter 14, Reference: uidl (Perl in a Nutshell)

umask(): Chapter 5, Reference: umask (Perl in a Nutshell)

umask function: 29.2.186. umask (Programming Perl)

umask values: 7.1. Opening a File (Perl Cookbook)

uname() (POSIX): 17.8. Finding Your Own Name and Address (Perl Cookbook)

unary operators: 4.5.2. Unary Operators (Perl in a Nutshell)

1.5. Operators (Programming Perl)

3. Unary and Binary Operators (Programming Perl)

arithmetic: 1.5.4. Unary Arithmetic Operators (Programming Perl)

Boolean: 1.5.7. Some File Test Operators (Programming Perl)

class handler, invoking: 13.1. The overload Pragma (Programming Perl)

functions, behaving as: 3.1. Terms and List Operators (Leftward) (Programming Perl)

ideographic: 3.5. Ideographic Unary Operators (Programming Perl)

list operators, distinguishing from: 3.10. Named Unary and File Test Operators (Programming Perl)

named: 2.11.3. Filename Globbing Operator (Programming Perl)

3.1. Terms and List Operators (Leftward) (Programming Perl)
3.10. Named Unary and File Test Operators (Programming Perl)
listing of: 3.10. Named Unary and File Test Operators (Programming Perl)

prototyping functions as: 6.4.2. Care with Prototypes (Programming Perl)

unbuffered input/output: 7.0. Introduction (Perl Cookbook)

7.12. Flushing Output (Perl Cookbook)
8.0. Introduction (Perl Cookbook)
15.6. Reading from the Keyboard (Perl Cookbook)

uncompressing Perl source code: 2.3.1. Installing on Unix (Perl in a Nutshell)

2.3.2.2. Standard Perl distribution (Perl in a Nutshell)

uncontrol subroutine: 15.8. Using POSIX termios (Perl Cookbook)

undef: 11.0. Introduction (Perl Cookbook)

Chapter 5, Reference: undef (Perl in a Nutshell)
4.2.4. Variables (Perl in a Nutshell)

undef function: 24.2.1. Time Efficiency (Programming Perl)

2.8.1. List Assignment (Programming Perl)
29.2.187. undef (Programming Perl)
arrays, freeing memory from: 2.8.2. Array Length (Programming Perl)

undefined scalars: 2.6. Scalar Values (Programming Perl)

undefined subroutines, calling with AUTOLOAD: 10.2. Autoloading (Programming Perl)

undefined (undef) value: 1.0. Introduction (Perl Cookbook)

undelete_message() (Mail::Folder): Chapter 14, Reference: undelete_message (Perl in a Nutshell)

-underline option (widgets): 18.3. Common Widget Configuration Options (Perl in a Nutshell)

Underscore module: 14.1.3. Magically Banishing $_ (Programming Perl)

undump program: 3.2. Command-Line Options (Perl in a Nutshell)

unequal (see equality operators)

unescape_from() (Mail::Internet): Chapter 14, Reference: unescape_from (Perl in a Nutshell)

Unicode: 1.0. Introduction (Perl Cookbook)

2.1. Atoms (Programming Perl)

15. Unicode (Programming Perl)

case translation tables: 15.2. Effects of Character Semantics (Programming Perl)

converting to characters: 29.2.14. chr (Programming Perl)

editors for: 15.2. Effects of Character Semantics (Programming Perl)

information about: 5.4.3. Unicode Properties (Programming Perl)

line separator character: 2.2. Molecules (Programming Perl)

locales and: 29.2.82. lc (Programming Perl)

paragraph separator character: 2.2. Molecules (Programming Perl)

Perl properties for: 5.4. Character Classes (Programming Perl)

properties: 5.4.3. Unicode Properties (Programming Perl)

bidirectional rendering: 5.4.3.2. Standard Unicode properties (Programming Perl)
block properties: 5.4.3.3. Unicode block properties (Programming Perl)
decomposition of characters: 5.4.3.2. Standard Unicode properties (Programming Perl)
Perl character class shortcuts and: 5.4.2. Classic Perl Character Class Shortcuts (Programming Perl)
Perl composites: 5.4.3.1. Perl's Unicode properties (Programming Perl)
standard: 5.4.3.2. Standard Unicode properties (Programming Perl)
syllabaries, classifying by vowel sounds: 5.4.3.2. Standard Unicode properties (Programming Perl)

properties database: 15.2. Effects of Character Semantics (Programming Perl)

smiley face: 29.2.14. chr (Programming Perl)

summary of, accessing: 15.2. Effects of Character Semantics (Programming Perl)

support for, turning on: 32.1.6. Internationalization and Locale (Programming Perl)

titlecase, converting strings to: 5.2.4. The tr/// Operator (Transliteration) (Programming Perl)

Unicode Standard, Version 3.0: 15.2. Effects of Character Semantics (Programming Perl)

use in Perl, caveats on: 15.3. Caution, [ren2bold] Working (Programming Perl)

wildcard metasymbols, matching with: 5.3.3. Wildcard Metasymbols (Programming Perl)

Unicode characters: 1.7. Regular Expressions (Programming Perl)

in identifiers: 2.5. Names (Programming Perl)
smiley: 2.6.2. String Literals (Programming Perl)

unimport(): 1.18. Program: psgrep (Perl Cookbook)

13.15. Creating Magic Variables with tie (Perl Cookbook)

uninitialized, variables: 1.2.1.1. Singularities (Programming Perl)

unions of lists: 4.7. Finding Elements in One Array but Not Another (Perl Cookbook)

unique list elements, extracting: 4.6. Extracting Unique Elements from a List (Perl Cookbook)

unique_name() (Net::FTP): Chapter 16, Reference: unique_name (Perl in a Nutshell)

uniqueness of objects: 11.2.8. Uniqueness of Objects in Memory (Advanced Perl Programming)

UNIVERSAL class: 12.5.3. UNIVERSAL: The Ultimate Ancestor Class (Programming Perl)

methods, adding to: 12.5.3. UNIVERSAL: The Ultimate Ancestor Class (Programming Perl)

UNIVERSAL module: 7.3. UNIVERSAL (Advanced Perl Programming)

13.8. Determining Subclass Membership (Perl Cookbook)
8.163. UNIVERSAL (Perl in a Nutshell)
32.1.14. Convenient Classes (Programming Perl)

Universal Naming Convention (UNC): 2.2.2. Microsoft Windows NT/2000 (Perl for System Administration)

account creation/deletion, programs for: 3.3.2.1. Unix account creation and deletion routines (Perl for System Administration)

communicating with Microsoft SQL Server: 7.1. Interacting with an SQL Server from Perl (Perl for System Administration)

directories, hidden: 10.2.1. Local Signs of Peril (Perl for System Administration)

disk quotas on: 2.5. Manipulating Disk Quotas (Perl for System Administration)

file operations on, tracking: 4.4.2. Tracking Operations in Unix (Perl for System Administration)

filesystems

/proc: 4.3.3. Using the /proc Filesystem (Perl for System Administration)
querying usage on: 2.6. Querying Filesystem Usage (Perl for System Administration)
traversing/walking: 2.3. Walking or Traversing the Filesystem (Perl for System Administration)

group ID (GID): 3.1.1. The Classic Unix Password File (Perl for System Administration)

host files

generating: 5.1.1. Generating Host Files (Perl for System Administration)
parsing: 5.1. Host Files (Perl for System Administration)
source control systems: 5.1.4. Incorporating a Source Code Control System (Perl for System Administration)

installing modules on: 1.5.1. Installing Modules on Unix (Perl for System Administration)

analyzing: 9.5. Log Analysis (Perl for System Administration)
wtmp: 9.2. Binary Log Files (Perl for System Administration)

network operations on, tracking: 4.4.2. Tracking Operations in Unix (Perl for System Administration)

password file: 3.1.1. The Classic Unix Password File (Perl for System Administration)

passwords: 3.3.2.1. Unix account creation and deletion routines (Perl for System Administration)

privileges on, dropping: 1.6.2. Drop Your Privileges as Soon as Possible (Perl for System Administration)

process control: 4.3. Unix Process Control (Perl for System Administration)

process table, module for interface to: 4.3.4. Using the Proc::ProcessTable Module (Perl for System Administration)

processes, listing: 4.3. Unix Process Control (Perl for System Administration)

shells: 3.1.1. The Classic Unix Password File (Perl for System Administration)

user identity: 3.1. Unix User Identity (Perl for System Administration)

1.2.1.1. Singularities (Programming Perl)
#! (shebang) line: 3. The Perl Interpreter (Perl in a Nutshell)
command processing: 3.1. Command Processing (Perl in a Nutshell)
CPAN modules, installing on: 22.2.1. Decompressing and Unpacking CPAN Modules (Programming Perl)
fileglobbing: 32.1.4. Filenames, Filesystems, and File Locking (Programming Perl)
File::Spec::Unix module: 32.1.4. Filenames, Filesystems, and File Locking (Programming Perl)
installing Perl on: 2.3.1. Installing on Unix (Perl in a Nutshell)
security bugs: 23.2.1. Unix Kernel Security Bugs (Programming Perl)
sockets for: 32.1.8. Networking and Interprocess Communication (Programming Perl)

test command, test scripts and: 1.3.1. How to Do It (Programming Perl)

truncating kernel interpretation of #! line: 19.1. Command Processing (Programming Perl)

Unix domain sockets: 17.0. Introduction (Perl Cookbook)

17.6. Using UNIX Domain Sockets (Perl Cookbook)
13. Sockets (Perl in a Nutshell)

UnixDate(): 3.7. Parsing Dates and Times from Strings (Perl Cookbook)

unless modifier: 4.1. Simple Statements (Programming Perl)

unless statement

4.3.1. Conditionals and Loops (Perl in a Nutshell)
4.3.1.4. Modifiers (Perl in a Nutshell)

unless statements: 1.6.1.1. The if and unless statements (Programming Perl)

if statements, using instead of: 4.3. if and unless Statements (Programming Perl)

unlink(): 9.2. Deleting a File (Perl Cookbook)

9.8. Removing a Directory and Its Contents (Perl Cookbook)
Chapter 5, Reference: unlink (Perl in a Nutshell)

unlink function: 29.2.188. unlink (Programming Perl)

2.7.2. Boolean Context (Programming Perl)

unmark() (News::Newsrc): Chapter 15, Reference: unmark (Perl in a Nutshell)

unmark_list() (News::Newsrc): Chapter 15, Reference: unmark_list (Perl in a Nutshell)

unmark_range() (News::Newsrc): Chapter 15, Reference: unmark_range (Perl in a Nutshell)

unmarked_articles() (News::Newsrc): Chapter 15, Reference: unmarked_articles (Perl in a Nutshell)

unordered lists (see hashes)

unpack: 25.2. Endianness and Number Width (Programming Perl)

unpack function: 29.2.189. unpack (Programming Perl)

template characters for: 29.2.108. pack (Programming Perl)

unpack() function (Perl): 9.2.1. Using unpack( ) (Perl for System Administration)

unpacking CPAN modules: 22.2.1. Decompressing and Unpacking CPAN Modules (Programming Perl)

unpack_sockaddr_in() (Socket): Chapter 13, Reference: unpack_sockaddr_in (Perl in a Nutshell)

unpack_sockaddr_un() (Socket): Chapter 13, Reference: unpack_sockaddr_un (Perl in a Nutshell)

unpacking Perl source code: 2.3.1. Installing on Unix (Perl in a Nutshell)

2.3.2.2. Standard Perl distribution (Perl in a Nutshell)

unpost() (Menu widget): 18.15.2. Menu Methods (Perl in a Nutshell)

unqualified, names, searching for: 2.5.1. Name Lookups (Programming Perl)

unsafe operations: 3.2. Command-Line Options (Perl in a Nutshell)

19.1.3. Switches (Programming Perl)

unshift()

Chapter 5, Reference: unshift (Perl in a Nutshell)
circular lists: 4.16. Implementing a Circular List (Perl Cookbook)
Tie::IxHash module and: 5.6. Retrieving from a Hash in Insertion Order (Perl Cookbook)

unshift function: 9. Data Structures (Programming Perl)

29.2.190. unshift (Programming Perl)

unsigned integers, lists of, storing: 29.2.195. vec (Programming Perl)

unsigned shorts: 29.2.162. sprintf (Programming Perl)

Unsolicited Commercial Email (UCE) (see spam)

unsub_groups() (News::Newsrc): Chapter 15, Reference: unsub_groups (Perl in a Nutshell)

unsubscribe() (News::Newsrc): Chapter 15, Reference: unsubscribe (Perl in a Nutshell)

untie(): 14.1. Making and Using a DBM File (Perl Cookbook)

Chapter 5, Reference: untie (Perl in a Nutshell)

untie function: 14. Tied Variables (Programming Perl)

14.5. A Subtle Untying Trap (Programming Perl)
29.2.21. dbmclose (Programming Perl)
29.2.191. untie (Programming Perl)
outstanding references, not eliminating: 14.1. Tying Scalars (Programming Perl)

until loops: 4.4.1. while and until Statements (Programming Perl)

until modifier: 4.1. Simple Statements (Programming Perl)

until statement

4.3.1.1. while loops (Perl in a Nutshell)
4.3.1.4. Modifiers (Perl in a Nutshell)

untying trap: 14.5. A Subtle Untying Trap (Programming Perl)

up method: 17.2.3.2. Semaphores (Programming Perl)

upcase function: 6.2.1. Tricks with Parameter Lists (Programming Perl)

UPDATE command (SQL): D.4. Changing Table Information (Perl for System Administration)

update_message() (Mail::Folder): Chapter 14, Reference: update_message (Perl in a Nutshell)

uppercase, converting to: 2.6.2. String Literals (Programming Perl)

5.2.3. The s/// Operator (Substitution) (Programming Perl)

URI modules: 17.5. The URI Module (Perl in a Nutshell)

URI::Escape: 17.5. The URI Module (Perl in a Nutshell)

URI::Heuristic: 20.7. Finding Stale Links (Perl Cookbook)

17.5. The URI Module (Perl in a Nutshell)

URI::URL: 17.5.2. URI::URL (Perl in a Nutshell)

URI::URL module: 17.1. LWP Overview (Perl in a Nutshell)

URIs (Universal Resource Identifiers): 17.1. LWP Overview (Perl in a Nutshell)

url()

CGI.pm module: Chapter 10, Reference: url (Perl in a Nutshell)
HTTP::Daemon module: Chapter 17, Reference: url (Perl in a Nutshell)
HTTP::Request module: Chapter 17, Reference: url (Perl in a Nutshell)

urlify program: 6.21. Program: urlify (Perl Cookbook)

URLs (uniform resource locators): 19.0. Introduction (Perl Cookbook)

Chapter 19, Reference: CanonicalizeURL (Perl in a Nutshell)

encoding: 9.2. URL Encoding (Perl in a Nutshell)

extra path information: 9.3. Extra Path Information (Perl in a Nutshell)

extracting from HTML: 20.3. Extracting URLs (Perl Cookbook)

fetching from Perl scripts: 20.1. Fetching a URL from a Perl Script (Perl Cookbook)

putting HTML links around: 6.21. Program: urlify (Perl Cookbook)

redirecting CGI requests: 19.8. Redirecting to a Different Location (Perl Cookbook)

URI::URL module: 17.1. LWP Overview (Perl in a Nutshell)

17.5.2. URI::URL (Perl in a Nutshell)

use(): Chapter 5, Reference: use (Perl in a Nutshell)

use attributes pragma: 6.5. Subroutine Attributes (Programming Perl)

use base declarations: 12.5.1. Inheritance Through @ISA (Programming Perl)

pseudohash implementations, requirement with: 12.7.1. Field Declarations with use fields (Programming Perl)

use base pragma: 31.3. use base (Programming Perl)

use blib pragma: 31.4. use blib (Programming Perl)

use bytes pragma: 15.2. Effects of Character Semantics (Programming Perl)

use charnames pragma: 15.2. Effects of Character Semantics (Programming Perl)

use command: 10. Packages (Programming Perl)

use declarations: 1.2.1.4. Simplicities (Programming Perl)

4.7. Global Declarations (Programming Perl)
4.9. Pragmas (Programming Perl)
(see also pragmas)
tie function and: 14. Tied Variables (Programming Perl)
use strict: 24.1.2. Frequently Ignored Advice (Programming Perl)

use declarations (pragmas): 6.2. Packages and Files (Advanced Perl Programming)

6.5. Importing Symbols (Advanced Perl Programming)

12.0. Introduction (Perl Cookbook)

7. Packages, Modules, and Objects (Perl in a Nutshell)

7.2. Modules (Perl in a Nutshell)

trapping errors in: 12.2. Trapping Errors in require or use (Perl Cookbook)

use autouse: 12.3. Delaying use Until Run Time (Perl Cookbook)

use English: 4.4. Special Variables (Perl in a Nutshell)

use integer: 4.5.3. Arithmetic Operators (Perl in a Nutshell)

use lib: 12.7. Keeping Your Own Module Directory (Perl Cookbook)

use locale: 1.9. Controlling Case (Perl Cookbook)

6.0. Introduction (Perl Cookbook)
6.12. Honoring Locale Settings in Regular Expressions (Perl Cookbook)

use overload pragma: 13.14. Overloading Operators (Perl Cookbook)

use Socket: 13.1.1. Initializing a Socket (Perl in a Nutshell)

use fields declarations: 12.5.1. Inheritance Through @ISA (Programming Perl)

use fields pragma:: 12.7.1. Field Declarations with use fields (Programming Perl)

use filetest pragma: 3.10. Named Unary and File Test Operators (Programming Perl)

use overload pragma: 13.1. The overload Pragma (Programming Perl)

use statement: 21.1. How Perl Works (Programming Perl)

USE statement (SQL): D.1. Creating /Deleting Databases and Tables (Perl for System Administration)

adding/removing

API calls for: 3.3.2.2. Windows NT/2000 account creation and deletion routines (Perl for System Administration)
modules for: 3.3.2.2. Windows NT/2000 account creation and deletion routines (Perl for System Administration)

logins, security and: 10.2.2. Finding Problematic Patterns (Perl for System Administration)

process scripts for: 3.3.3. The Process Scripts (Perl for System Administration)
with ADSI: 6.5.8. Working with Users via ADSI (Perl for System Administration)

Unix: 3.1.1. The Classic Unix Password File (Perl for System Administration)

Windows NT/2000: 3.2.2. NT/2000 User ID Numbers (Perl for System Administration)

use subs declarations: 12.5.4. Method Autoloading (Programming Perl)

use utf8 pragma: 5.3.3. Wildcard Metasymbols (Programming Perl)

use warnings pragma: 20. The Perl Debugger (Programming Perl)

use_alarm() (LWP::UserAgent): Chapter 17, Reference: use_alarm (Perl in a Nutshell)

use_named_parameters() (CGI.pm): Chapter 10, Reference: use_named_parameters (Perl in a Nutshell)

Usenet news: 18.4. Reading and Posting Usenet News Messages (Perl Cookbook)

15. Usenet News (Perl in a Nutshell)

Net::News module: 15.2. Net::NNTP (Perl in a Nutshell)

News::Newsrc module: 15.3. The News::Newsrc Module (Perl in a Nutshell)

Perl-related newsgroups

1.4.1. The comp.lang.perl.* Newsgroups (Perl in a Nutshell)

Usenet, Perl modules for: 22.1. The CPAN modules Directory (Programming Perl)

user()

Mail::Address module: Chapter 14, Reference: user (Perl in a Nutshell)

14.2.6. Parse Email Addresses with Mail::Address (Perl in a Nutshell)

Net::POP3 module: Chapter 14, Reference: user (Perl in a Nutshell)

14.1.3. Retrieving Email with Net::POP3 (Perl in a Nutshell)

URI::URL module: Chapter 17, Reference: user (Perl in a Nutshell)

user-defined functions (see subroutines)

user-defined structures: 2.1. User-Defined Structures (Advanced Perl Programming)

matrices example: 2.2. Example: Matrices (Advanced Perl Programming)

user-defined subroutines: 1.2.2. Verbs (Programming Perl)

1.2.2. Verbs (Programming Perl)
(see also subroutines)

user efficiency, Perl programming: 24.2.6. User Efficiency (Programming Perl)

user input, security of: 1.6.3. Be Careful When Reading Data (Perl for System Administration)

user interfaces, modules providing: 32.1.11. User Interfaces (Programming Perl)

User() (Mail::POP3Client): Chapter 14, Reference: User (Perl in a Nutshell)

User Security Model (USM): E. The Twenty-Minute SNMP Tutorial (Perl for System Administration)

identity of

Unix: 3.1. Unix User Identity (Perl for System Administration)
Windows NT/2000: 3.2.1. NT/2000 User Identity Storage and Access (Perl for System Administration)

rights of, Windows NT/2000: 3.2.5. NT/2000 User Rights (Perl for System Administration)

user_agent() (CGI.pm): Chapter 10, Reference: user_agent (Perl in a Nutshell)

USER command (POP3): 14.1.3. Retrieving Email with Net::POP3 (Perl in a Nutshell)

UserAgent() (Win32::Internet): Chapter 19, Reference: UserAgent (Perl in a Nutshell)

UserAgent object: 17.1. LWP Overview (Perl in a Nutshell)

17.2. The LWP Modules (Perl in a Nutshell)
17.2.3. LWP::UserAgent (Perl in a Nutshell)

UserCreate() (Win32::NetAdmin): Chapter 19, Reference: UserCreate (Perl in a Nutshell)

User::grent module: 8.164. User::grent (Perl in a Nutshell)

29.2.44. getgrent (Programming Perl)
32.1.7. Operating System Interfaces (Programming Perl)

user_name() (CGI.pm): Chapter 10, Reference: user_name (Perl in a Nutshell)

User::pwent module: 8.165. User::pwent (Perl in a Nutshell)

29.2.63. getpwuid (Programming Perl)
32.1.7. Operating System Interfaces (Programming Perl)
Class::Struct, using to create objects and accessors: 32.6. Class::Struct (Programming Perl)

username, passwd file entry from: 29.2.62. getpwnam (Programming Perl)

Username() (Win32::Internet): Chapter 19, Reference: Username (Perl in a Nutshell)

users

authenticating, Perl modules for: 22.1. The CPAN modules Directory (Programming Perl)
CPU times: 29.2.181. times (Programming Perl)
fetching information on: 5.1. Perl Functions by Category (Perl in a Nutshell)
granting limited privileges to: 23.1. Handling Insecure Data (Programming Perl)

userstats program (example): 14.1. Making and Using a DBM File (Perl Cookbook)

guts: 21. Internals and Externals (Programming Perl)

members, login names: 21. Internals and Externals (Programming Perl)

USM (User Security Model): E. The Twenty-Minute SNMP Tutorial (Perl for System Administration)

UTF-8: 2.1. Atoms (Programming Perl)

characters,

globally switching interfaces to: 28.2. Special Variables in Alphabetical Order (Programming Perl)
converting to integers: 15.2. Effects of Character Semantics (Programming Perl)

utime(): 9.1. Getting and Setting Timestamps (Perl Cookbook)

Chapter 5, Reference: utime (Perl in a Nutshell)

utime function: 29.2.193. utime (Programming Perl)

utmp file (see /etc/utmp file)

UV (internal unsigned integer value): 21.2. Internal Data Types (Programming Perl)

uvi program (example): 9.1. Getting and Setting Timestamps (Perl Cookbook)

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