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Index: U

-u operator : The -x File Tests
undef
- array element access and : Array Element Access
- assigning lists and : Assignment
- associative array elements and : Hash Variables
- to control dbmopen( ) : Opening and Closing DBM Hashes
- as default value for $^I : Variable-Length ( Text) Databases
- definition of : The Undefined Value
- globbing return value : Globbing
- as initial value of local variables : Private Variables in Functions
- pop( ) return value : The push and pop Functions
- readdir( ) return value : Reading a Directory Handle
- resulting from split( ) : The split Function
- STDIN and : Input from STDIN
unless statement : (see if statement)
unlink( ) operator : Removing a File
- example of : File and Directory Manipulation
unpack( ) operator : Packing and Unpacking Binary Data
- example of
- - Getting Network Information
  - Fixed-Length Random Access Databases
- gethostbyname( ) return values and : Getting Network Information
unshift( ) operator : The shift and unshift Functions
until statement : (see while statement)
up-arrow, in regular expressions : Single-Character Patterns
uppercase for filehandles : Moving the Secret Word List into a Separate File
URLs (uniform resource locators) : CGI Developing
use statement : Passing Parameters via CGI
Usenet (comp.lang.perl) : Support
user function : (see subroutines)
user ID : The stat and lstat Functions
- accessing information : Getting Password and Group Information
username information, accessing : Getting Password and Group Information
/usr/dict/words : Exercises
utime( ) operator : Modifying Timestamps
UUCP : UUCP

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