Index

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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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