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Index: U

• UNC path : Using Pathnames and Filenames
• undef : The Undefined Value
• • array element access : Array Element Access
  • as default value for $^I : Variable-Length ( Text) Databases
  • as initial value of local variables : Private Variables in Functions
  • as return value from globbing : Globbing
  • as return value from pop( ) : The push and pop Functions
  • as return value from readdir( ) : Reading a Directory Handle
  • associative array elements : Hash Variables
  • resulting from split( ) : The split Function
  • STDIN and : Input from STDIN
  • to control dbmopen( ) : Opening and Closing DBM Hashes
  • when assigning lists : Assignment
• underscore (_), in variable names : Scalar Variables
• unless modifier : Expression Modifiers
• unless statement : (see if statement)
• • example of : Slight Diversion: die
• unlink( ) : Removing a File
• • example of : File and Directory Manipulation
• unpack( ) : Packing and Unpacking Binary Data
• • example of
  • • Getting Network Information
    • Fixed-Length Random-Access Databases
  • return values from gethostbyname( ) : Getting Network Information
• unshift( ) : The shift and unshift Functions
• until modifier : Expression Modifiers
• until statement : (see while statement)
• uppercase for filehandles : Moving the Secret Word List into a Separate File
• use statement
• • Passing Parameters via CGI
  • Creating Automation Objects
• user function : (see subroutines)
• utime( ) : Modifying Timestamps

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