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Index: U
- \U string escape: 1.13.2. Solution
- ualarm( ): 3.9.3. Discussion
- uc( ): 1.13.2. Solution
- ucfirst( ): 1.13.2. Solution
- UDP (User Datagram Protocol)
- writing clients for: 17.4.1. Problem
- writing servers for: 17.5.1. Problem
- umask values: 7.1.3. Discussion
- uname( ): 17.8.2. Solution
- unbuffered input/output: 7.. I/O Operations
- 7.19.3. Discussion
- 8.. Advanced Operations
- 15.6.1. Problem
- undef( ), compared to delete( ): 5.4.3. Discussion
- undefined values: 1.. Introduction
- underscore (_), file stat cache: 9.. Introduction
- Unicode: 1.. Unicode Support in Perl
- character database: 1.5.3. Discussion
- combined characters, canonicalizing strings with: 1.9.1. Problem
- converting Microsoft files to: 8.21.1. Problem
- encodings, XML and: 22.. XML Declaration
- named characters, using: 1.5.1. Problem
- reading and writing from filehandles: 8.20.1. Problem
- strings
- treating as octets: 1.10.1. Problem
- treating as single characters: 1.8.1. Problem
- Uniform Resource Locators (see URLs)
- unimport( ): 13.15.4. Tie Example: Outlaw $_
- unions of lists: 4.8.1. Problem
- computing: 4.9.1. Problem
- unique list elements, extracting: 4.7.1. Problem
- universal character code: 1.. The Universal Character Code
- UNIVERSAL module: 13.8.3. Discussion
- Unix
- domain sockets: 17.. Introduction
- 17.6.1. Problem
- I/O layers: 7.19.3. Discussion
- unix layer: 7.. I/O Operations
- 7.19.3. Discussion
- UnixDate( ): 3.7.3. Discussion
- unlink( ), removing directories and contents: 9.8.3. Discussion
- unpack( ): 1.1.2. Solution
- 1.4.3. Discussion
- fixed-length records: 8.15.2. Solution
- unread bytes, determining number: 7.21.1. Problem
- unshift( ), circular lists: 4.17.2. Solution
- updating random-access files: 8.13.1. Problem
- uppercase, converting to lowercase: 1.13.1. Problem
- uri_escape( ): 20.2.3. Discussion
- URI::Escape module: 20.2.3. Discussion
- URI::Heuristic module: 20.1.3. Discussion
- 20.7.3. Discussion
- urlify program: 6.21. Program: urlify
- URLs (Uniform Resource Locators): 19.. Architecture
- expanding tildes in filenames: 7.3.3. Discussion
- external redirection: 21.4.3. Discussion
- extracting from HTML: 20.3.1. Problem
- fetching from Perl scripts: 20.1.1. Problem
- putting HTML links around: 6.21. Program: urlify
- transparently storing information in: 21.10.1. Problem
- use autouse pragma: 12.3.1. Problem
- use bytes pragma: 1.10.2. Solution
- use charnames pragma: 1.5.3. Discussion
- use constant pragma: 1.21.2. Solution
- use lib pragma: 12.8.3. Discussion
- use locale pragma: 6.12.2. Solution
- use operator: 10.. Introduction
- use overload pragma: 13.14.1. Problem
- use pragmas: 6.12.2. Solution
- 12.. Modules
- trapping errors in: 12.2.1. Problem
- Usenet news messages: 18.4.1. Problem
- User Datagram Protocol (see UDP)
- user interfaces: 15.. Introduction
- adding text to images: 15.20.1. Problem
- checking for waiting input: 15.9.1. Problem
- clearing the screen: 15.3.1. Problem
- controlling programs with Expect: 15.13.1. Problem
- determining window size: 15.4.1. Problem
- dialog boxes, creating with Tk: 15.15.1. Problem
- DOS shell window, removing: 15.17.1. Problem
- editing input: 15.11.1. Problem
- full-screen mode: 15.. Introduction
- graphing data: 15.18.1. Problem
- 15.23. Program: graphbox
- managing screen: 15.12.1. Problem
- manipulating terminal directly: 15.8.1. Problem
- menus, creating with Tk: 15.14.1. Problem
- multiscreen CGI scripts: 19.11.1. Problem
- reading from keyboard: 15.6.1. Problem
- reading passwords without echo: 15.10.1. Problem
- ringing terminal bell: 15.7.1. Problem
- tcapdemo program: 15.21.1. Description
- testing programs if running interactively: 15.2.1. Problem
- text color: 15.5.1. Problem
- thumbnailing images: 15.19.1. Problem
- Tk resize events: 15.16.1. Problem
- User::pwent module: 4.16.3. Discussion
- userstats program: 14.1.3. Discussion
- usleep( ): 3.9.3. Discussion
- UTF-8: 1.. Unicode Support in Perl
- 8.20.3. Discussion
- utf8 I/O layer: 8.. I/O Layers
- utime( ), timestamps: 9.1.2. Solution
