Index

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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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