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Index: U
- \U string escape
: 1.9. Controlling Case
- \u string escape
: 1.9. Controlling Case
- uc( )
: 1.9. Controlling Case
- ucfirst( )
: 1.9. Controlling Case
- UDP protocol
- 
  - writing clients
: 17.4. Setting Up a UDP Client
  - writing servers
: 17.5. Setting Up a UDP Server
 
- udpmsg program (example)
: 17.5. Setting Up a UDP Server
- udpqotd program (example)
: 17.5. Setting Up a UDP Server
- umask values
: 7.1. Opening a File
- uname( ) (POSIX)
: 17.8. Finding Your Own Name and Address
- unbuffered input/output
- 
  - 7.0. Introduction
  - 7.12. Flushing Output
  - 8.0. Introduction
  - 15.6. Reading from the Keyboard
 
- uncontrol subroutine
: 15.8. Using POSIX termios
- undef( )
: 11.0. Introduction
- undefined (undef) value
: 1.0. Introduction
- Unicode
: 1.0. Introduction
- unimport( )
- 
  - 1.18. Program: psgrep
  - 13.15. Creating Magic Variables with tie
 
- unions of lists
: 4.7. Finding Elements in One Array but Not Another
- unique list elements, extracting
: 4.6. Extracting Unique Elements from a List
- UNIVERSAL package
: 13.8. Determining Subclass Membership
- Unix domain sockets
- 
  - 17.0. Introduction
  - 17.6. Using UNIX Domain Sockets
 
- UnixDate( )
: 3.7. Parsing Dates and Times from Strings
- unlink( )
- 
  - 9.2. Deleting a File
  - 9.8. Removing a Directory and Its Contents
 
- unpack( )
- 
  - 1.1. Accessing Substrings
  - 1.4. Converting Between ASCII Characters and Values
  - 8.15. Reading Fixed-Length Records
  - converting binary and decimal numbers
: 2.4. Converting Between Binary and Decimal
 
- unshift( )
- 
  - circular lists
: 4.16. Implementing a Circular List
  - Tie::IxHash module and
: 5.6. Retrieving from a Hash in Insertion Order
 
- untie( )
: 14.1. Making and Using a DBM File
- uppercase, converting to lowercase
: 1.9. Controlling Case
- URI::Heuristic
: 20.7. Finding Stale Links
- urlify program
: 6.21. Program: urlify
- URLs (Uniform Resource Locators)
: 19.0. Introduction
- 
  - extracting from HTML
: 20.3. Extracting URLs
  - fetching from Perl scripts
: 20.1. Fetching a URL from a Perl Script
  - putting HTML links around
: 6.21. Program: urlify
  - redirecting CGI requests
: 19.8. Redirecting to a Different Location
 
- use pragmas
: 12.0. Introduction
- 
  - trapping errors in
: 12.2. Trapping Errors in require or use
  - use autouse pragma
: 12.3. Delaying use Until Run Time
  - use lib pragma
: 12.7. Keeping Your Own Module Directory
  - use locale pragma
  
- 
    - 1.9. Controlling Case
    - 6.0. Introduction
    - 6.12. Honoring Locale Settings in Regular Expressions
  
 
- use overload pragma
: 13.14. Overloading Operators
 
- Usenet news
: 18.4. Reading and Posting Usenet News Messages
- user input
: (see input)
- user interfaces
: 15.0. Introduction
- 
  - checking for waiting input
: 15.9. Checking for Waiting Input
  - clearing the screen
: 15.3. Clearing the Screen
  - controlling programs with Expect
: 15.13. Controlling Another Program with Expect
  - determining window size
: 15.4. Determining Terminal or Window Size
  - dialog boxes with Tk
: 15.15. Creating Dialog Boxes with Tk
  - editing input
: 15.11. Editing Input
  - full-screen mode
: 15.0. Introduction
  - managing screen
: 15.12. Managing the Screen
  - manipulating terminal directly
: 15.8. Using POSIX termios
  - menus with Tk
: 15.14. Creating Menus with Tk
  - multiscreen CGI scripts
: 19.12. Writing a Multiscreen CGI Script
  - parsing command-line options
: 15.1. Parsing Program Arguments
  - reading from keyboard
: 15.6. Reading from the Keyboard
  - reading passwords without echo
: 15.10. Reading Passwords
  - removing DOS shell window
: 15.17. Removing the DOS Shell Window with Windows Perl/Tk
  - ringing terminal bell
: 15.7. Ringing the Terminal Bell
  - tcapdemo program
: 15.18. Program: Small termcap program
  - testing programs if running interactively
: 15.2. Testing Whether a Program Is Running Interactively
  - text color
: 15.5. Changing Text Color
  - Tk resize events
: 15.16. Responding to Tk Resize Events
 
- userstats program (example)
: 14.1. Making and Using a DBM File
- utime( )
: 9.1. Getting and Setting Timestamps
- uvi program (example)
: 9.1. Getting and Setting Timestamps
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Copyright © 1999
 O'Reilly & Associates, Inc.
All Rights Reserved.
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