Symbols & Numbers | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z

Index: U

uid (user-ID): 11.6.1. The stat and lstat Functions

undef operator: 2.12. The defined Function

slices and: 17.6. Slices

undef value: 2.11. The undef Value

underscore (_)

in integer literals: 2.2.3. Integer Literals

in variable names: 4.10. The use strict Pragma

underscore filehandle: 11.6.5. Using the Special Underscore Filehandle

Unicode: B.30. Locales and Unicode

Universal Time: 11.6.2. The localtime Function

Unix

input/output and: 11.1. What Is a Filehandle?

model of files/directories and: 13.3. Links and Files

portability and: 1.1.2. Why Are There So Many Footnotes?

utilities for

diamond operator and: 6.2. Input from the Diamond Operator

regular expressions and: 7. Concepts of Regular Expressions

Unix password databases: B.7.1. Direct System Database Access

Unix signals, sending/receiving: 14.7. Sending and Receiving Signals

unless control structure: 10.1. The unless Control Structure

unless modifier: 10.3. Expression Modifiers

10.3. Expression Modifiers

unlink operator: 13.1. Removing Files

unpack function: 16.2. Manipulating Data with pack and unpack

unquoted hash keys: 17.4. Unquoted Hash Keys

unshift operator: 3.4.2. The shift and unshift Operators

until control structure: 10.2. The until Control Structure

until modifier: 10.3. Expression Modifiers

10.3. Expression Modifiers

unwinding hashes: 5.2.1. The Hash as a Whole

uppercase

case shifting and: 9.6.5. Case Shifting

vs. lowercase in variable names: 2.5.1. Choosing Good Variable Names

URLs

code in this book: 0.3. Code Examples

CPAN: 1.3.1. What Is CPAN?

B.4.3. Finding and Installing Modules

Perl Monastery: 1.3.3. Are There Any Other Kinds of Support?

search interfaces for Perl: 1.3.1. What Is CPAN?

use directives: B.4.3. Finding and Installing Modules

pragmas and: B.6. Pragmas

use strict pragma: 4.10. The use strict Pragma

B.6.4. The strict Pragma

user functions (see subroutines)

user-ID, numeric ($uid): 11.6.1. The stat and lstat Functions

changing file ownership and: 13.6. Changing Ownership

user-ID (uid): 11.6.1. The stat and lstat Functions

utilities

inside: B.4.3. Finding and Installing Modules

perlbug: 1.3.4. What If I Find a Bug in Perl?

Unix (see Unix, utilities for)

which_dbm: 16.1. DBM Files and DBM Hashes

utime function: 13.7. Changing Timestamps

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