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Index: U

UNC path : 10.3. Using Pathnames and Filenames

undef : 2.9. The Undefined Value

array element access : 3.4.2. Array Element Access

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

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

as return value from globbing : 12.2. Globbing

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

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

associative array elements : 5.2. Hash Variables

resulting from split( ) : 7.6.1. The split Function

STDIN and : 6.1. Input from STDIN

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

when assigning lists : 3.4.1. Assignment

underscore (_), in variable names : 2.5. Scalar Variables

unless modifier : 9.5. Expression Modifiers

unless statement : (see if statement)

example of : 10.4. A Slight Diversion: die

unlink( ) : 13.1. Removing a File

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

unpack( ) : 16.2. Packing and Unpacking Binary Data

example of

16.3. Getting Network Information

17.4. Fixed-Length Random-Access Databases

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

unshift( ) : 3.4.4. The shift and unshift Functions

until modifier : 9.5. Expression Modifiers

until statement : (see while statement)

uppercase for filehandles : 1.6.10. Moving the Secret Word List into a Separate File

use statement

18.4. Passing Parameters via CGI

19.2. Creating Automation Objects

user function : (see subroutines)

utime( ) : 13.5. Modifying Timestamps

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