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Index: U

-u operator : 10.5. The -x File Tests

undef

array element access and : 3.4.2. Array Element Access

assigning lists and : 3.4.1. Assignment

associative array elements and : 5.2. Hash Variables

to control dbmopen( ) : 17.2. Opening and Closing DBM Hashes

as default value for $^I : 17.5. Variable-Length ( Text) Databases

definition of : 2.9. The Undefined Value

globbing return value : 12.2. Globbing

as initial value of local variables : 8.5. Private Variables in Functions

pop( ) return value : 3.4.3. The push and pop Functions

readdir( ) return value : 12.5. Reading a Directory Handle

resulting from split( ) : 7.6.1. The split Function

STDIN and : 6.1. Input from STDIN

unless statement : (see if statement)

unlink( ) operator : 13.1. Removing a File

example of : A.12. Chapter 13, File and Directory Manipulation

unpack( ) operator : 16.2. Packing and Unpacking Binary Data

example of

16.3. Getting Network Information

17.4. Fixed-Length Random Access Databases

gethostbyname( ) return values and : 16.3. Getting Network Information

unshift( ) operator : 3.4.4. The shift and unshift Functions

until statement : (see while statement)

up-arrow, in regular expressions : 7.3.1. Single-Character Patterns

uppercase for filehandles : 1.5.10. Moving the Secret Word List into a Separate File

URLs (uniform resource locators) : 19. CGI Programming

use statement : 19.4. Passing Parameters via CGI

Usenet (comp.lang.perl) : Support

user function : (see subroutines)

user ID : 10.6. The stat and lstat Functions

accessing information : 16.1. Getting Password and Group Information

username information, accessing : 16.1. Getting Password and Group Information

/usr/dict/words : 7.7. Exercises

utime( ) operator : 13.7. Modifying Timestamps

UUCP : UUCP

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