Symbols | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z

Index: E

-e command-line option: 16.4.1. In-place Editing from the Command Line (Learning Perl)

-echo option: 16.2.2. Manipulating Resources with Tk::CmdLine Subroutines (Mastering Perl/Tk)

-elementborderwidth option: 6.3.2. Scrollbar Options (Mastering Perl/Tk)

6.3.4. Scrollbar Style (Mastering Perl/Tk)

-elements option: 14.5.3. Tk::LCD (Mastering Perl/Tk)

-elide option: 8.5.1. Tag Options (Mastering Perl/Tk)

-eval option, find2perl command and: B.26. Converting find Command Lines to Perl (Learning Perl)

-exact option: 8.16. Marks (Mastering Perl/Tk)

-expand option

allocation rectangle: 2.1.1. Options for pack (Mastering Perl/Tk)

anchoring and: 2.1.1. Options for pack (Mastering Perl/Tk)

2.1.6. Anchoring a Widget in Its Allocation Rectangle (Mastering Perl/Tk)

pack method and: 8.2.2. Widget Size (Mastering Perl/Tk)

syntax: 2.1.5. Expanding the Allocation Rectangle (Mastering Perl/Tk)

-exportselection option

Entry widgets and: 5.2.2. Entry Options (Mastering Perl/Tk)

5.2.6. Text Selection Options (Mastering Perl/Tk)

Listbox modes and: 7.3.1. Operating System Differences (Mastering Perl/Tk)

Listbox widgets and: 7.2. Listbox Options (Mastering Perl/Tk)

Text widgets and: 8.2. Text Widget Options (Mastering Perl/Tk)

-extent option: 9.6.1. The Arc Item (Mastering Perl/Tk)

\E (end) character: 4.6.4. Character Classes (Perl in a Nutshell)

-e (execute) command-line switch: 19.1.3. Switches (Programming Perl)

-e (exists) file test: 1.5.7. Some File Test Operators (Programming Perl)

3.10. Named Unary and File Test Operators (Programming Perl)

-e file test operator: 4.5.8. File Test Operators (Perl in a Nutshell)

E<\\> interior sequence (pod): 4.13.2. Interior Sequences (Perl in a Nutshell)

/e pattern modifier: 5.2.3. The s/// Operator (Substitution) (Programming Perl)

-e option

(perlbug): 6.6. The perlbug Program (Perl in a Nutshell)
(perlcc): 3.4. The Perl Compiler (Perl in a Nutshell)

-E option (dprofpp): 6.5. The Perl Profiler (Perl in a Nutshell)

\e (escape) sequence: 4.6.3. Escaped Sequences (Perl in a Nutshell)

\\\\E shortcut: 9.6.5. Case Shifting (Learning Perl)

\E string metacharacter: 1.13.3. Discussion (Perl Cookbook)

/e substitution modifier: 1.8.3. Discussion (Perl Cookbook)

6.0.2. Pattern-Matching Modifiers (Perl Cookbook)
6.4.3. Discussion (Perl Cookbook)
7.7.3. Discussion (Perl Cookbook)

each function: 5.3.2. The each Function (Learning Perl)

5. Function Reference (Perl in a Nutshell)
5.10.3. Discussion (Perl Cookbook)
9.4.3. Access and Printing of a Hash of Hashes (Programming Perl)
14.3.1. Hash-Tying Methods (Programming Perl)
29.2.30. each (Programming Perl)
DBM hashes and: 16.1.2. Using a DBM Hash (Learning Perl)

eager pattern matching: 6.0.1. The Tricky Bits (Perl Cookbook)

ebcdic( ) (Net::FTP): 18.2. Net::FTP (Perl in a Nutshell)

echo and password input: 15.10.1. Problem (Perl Cookbook)

echo command: 12.2. Globbing (Learning Perl)

ECMAscript: 7.1. DOM and Perl (Perl & XML)

EDI: 14.1. What Is SOAP? (Perl in a Nutshell)

editing files (see file contents)

editing input: 15.11.1. Problem (Perl Cookbook)

editors, support for debugging: 20.3.1. Editor Support for Debugging (Programming Perl)

/ee substitution modifier: 1.8.2. Solution (Perl Cookbook)

6.4.3. Discussion (Perl Cookbook)

effective GID (see $) variable)

effective GID (group ID): 28.2. Special Variables in Alphabetical Order (Programming Perl)

effective UID ($EFFECTIVE_USER_ID): 28.2. Special Variables in Alphabetical Order (Programming Perl)

$EFFECTIVE_GROUP_ID: 28.2. Special Variables in Alphabetical Order (Programming Perl)

28.2. Special Variables in Alphabetical Order (Programming Perl)

$EFFECTIVE_GROUP_ID ($EGID) variable: 4.4.1. Global Special Variables (Perl in a Nutshell)

$EFFECTIVE_USER_ID: 28.2. Special Variables in Alphabetical Order (Programming Perl)

$EFFECTIVE_USER_ID ($>) variable: 4.4.1. Global Special Variables (Perl in a Nutshell)

efficiency (see performance)

profiling: 20.6. The Perl Profiler (Programming Perl)

$EGID variable: 4.4.1. Global Special Variables (Perl in a Nutshell)

Element handler (Expat): 13.3. Expat Handlers (Perl in a Nutshell)

Element node: 6.1. XML Trees (Perl & XML)

7.2.8. Element (Perl & XML)

-elementborderwidth option (Scrollbar): 21.9. The Scrollbar Widget (Perl in a Nutshell)

element_decl method for PerlSAX DTD handlers: 5.2. DTD Handlers (Perl & XML)

elements: 3. Lists and Arrays (Learning Perl)

2.2. Markup, Elements, and Structure (Perl & XML)
in arrays: 1.2.1.2.1. Arrays. (Programming Perl)
declaring: 2.10. Declaring Elements and Attributes (Perl & XML)
HTML::Element: 10.5. Creating New Elements (Perl & LWP)
of an array: 3.1. Accessing Elements of an Array (Learning Perl)
pop and push operators for: 3.4.1. The pop and push Operators (Learning Perl)
trees, attaching to other trees: 10.4. Attaching in Another Tree (Perl & LWP)
types: 2.2. Markup, Elements, and Structure (Perl & XML)

elements in arrays: Glossary (Programming Perl)

elements of arrays (see arrays)

elements of hashes (see hashes)

elements, trees: 9.1. Introduction to Trees (Perl & LWP)

children: 9.1. Introduction to Trees (Perl & LWP)
li elements: 9.1. Introduction to Trees (Perl & LWP)
tag comparison: 9.1. Introduction to Trees (Perl & LWP)
ul elements: 9.1. Introduction to Trees (Perl & LWP)

eleseif statements: 1.6.1.1. The if and unless statements (Programming Perl)

ellipses (...): 5.3.1. Metasymbol Tables (Programming Perl)

else clause, using with unless control structure: 10.1.1. The else Clause with unless (Learning Perl)

else keyword: 2.7. The if Control Structure (Learning Perl)

else statements: 1.6.1.1. The if and unless statements (Programming Perl)

elsif clause: 10.5. The elsif Clause (Learning Perl)

emacs

editor support for debugger: 20.3.1. Editor Support for Debugging (Programming Perl)
-*- sequences: 19.1. Command Processing (Programming Perl)

emacs editor, regular expressions, use of: 1.7. Regular Expressions (Programming Perl)

emacs text editor: 1.4. How Do I Make a Perl Program? (Learning Perl)

Emacs users, cperl-mode.el and: 1.5.1. Programming Style (Mastering Perl/Tk)

email: 16. Email Connectivity (Perl in a Nutshell)

22.1. The CPAN modules Directory (Programming Perl)

handling messages (Mail::Internet module): 16.2.4. Handle Messages with Mail::Internet (Perl in a Nutshell)

header control (Mail::Send module): 16.2.2. Better Header Control with Mail::Send (Perl in a Nutshell)

Mail modules: 16. Email Connectivity (Perl in a Nutshell)

16.2. The Mail Modules (Perl in a Nutshell)

matching valid addresses: 6.19.1. Problem (Perl Cookbook)

parsing addresses (Mail::Address module): 16.2.6. Parse Email Addresses with Mail::Address (Perl in a Nutshell)

Perl-related mailing lists: 1.4.3. Mailing Lists (Perl in a Nutshell)

random signatures: 16.22.1. Description (Perl Cookbook)

reading (Mail::Audit module): 16.2.9. Mail Filtering with Mail::Audit (Perl in a Nutshell)

reading (Mail::RBL module): 16.2.8. Checking Blacklisted Hosts with Mail::RBL (Perl in a Nutshell)

reading with POP3: 18.5.1. Problem (Perl Cookbook)

retrieving (Net::POP3 module): 16.1.3. Retrieving Email with Net::POP3 (Perl in a Nutshell)

sending: 18.3.1. Problem (Perl Cookbook)

sending HTML forms via: 19.13.1. Problem (Perl Cookbook)

sending (Mail::Mailer module): 16.2.1. Send Email with Mail::Mailer (Perl in a Nutshell)

sending (Net::SMTP module): 16.1.1. Send Email with Net::SMTP (Perl in a Nutshell)

sorting (example subroutine): 10.17. Program: Sorting Your Mail (Perl Cookbook)

tracking time path of: 3.11. Program: hopdelta (Perl Cookbook)

email addresses, compile time errors and: 3.5. Interpolating Arrays into Strings (Learning Perl)

email, Net::SMTP module for: B.5.8. The Net::SMTP Module (Learning Perl)

embedding

applications: 11.3. Options (Mastering Perl/Tk)

OpenGL in Perl/Tk window: 15.9.1. Embedding OpenGL in a Perl/Tk Window (Mastering Perl/Tk)

Perl/Tk in other windows: 22.2.1. Embedding Perl/Tk in Other Windows (Mastering Perl/Tk)

Tk window with id method: 13.3. Widget's ID (Mastering Perl/Tk)

widgets: 8.17. Embedding Widgets (Mastering Perl/Tk)

9.6.9. The Widget Item (Mastering Perl/Tk)

embedding code: B.24. Embedding (Learning Perl)

embedding Perl: 21.4. Embedding Perl (Using Perl from C) (Programming Perl)

32.1.17. Module Installation Support (Programming Perl)
Glossary (Programming Perl)
adding Perl interpreter to C program: 21.4.2. Adding a Perl Interpreter to Your C Program (Programming Perl)
compiling embedded programs: 21.4.1. Compiling Embedded Programs (Programming Perl)
evaluating Perl statement from C: 21.4.4. Evaluating a Perl Statement from C (Programming Perl)
perl interpreter program: 21. Internals and Externals (Programming Perl)
Perl stack, manipulating from C: 21.4.5. Fiddling with the Perl Stack from C (Programming Perl)

<Emphasis>Learning Perl, Third Edition<Default Para Font>: 0.1. Assumptions (Perl & XML)

empty angle operator (<>): 1.4. Filehandles (Programming Perl)

empty base class test: 13.9.3. Discussion (Perl Cookbook)

empty cells: 2.2.1.2. Empty cells (Mastering Perl/Tk)

empty string (""): 1.0. Introduction (Perl Cookbook)

empty subclass test: 12.5. Class Inheritance (Programming Perl)

Glossary (Programming Perl)

EmptyDocument method: 8.16.1. Setting and Getting the Gravity (Mastering Perl/Tk)

emptyTag( ) Writer method: 3.8. XML::Writer (Perl & XML)

encapsulation: 1.2.1.3. Complexities (Programming Perl)

8.3.4. Using Object Methods (Programming Perl)
12.1. Brief Refresher on Object-Oriented Lingo (Programming Perl)
Glossary (Programming Perl)
namespace-based: 14.6. Tie Modules on CPAN (Programming Perl)
objects in closures: 12.7.5. Using Closures for Private Objects (Programming Perl)

encoding conversions: 3.9.4. Encoding Conversion (Perl & XML)

encoding module: 8.62. encoding (Perl in a Nutshell)

encoding( ) (SOAP::Lite): 14.2.1. SOAP::Lite Methods (Perl in a Nutshell)

encoding URLs: 9.2. URL Encoding (Perl in a Nutshell)

encodings (character): 2.6. Unicode, Character Sets, and Encodings (Perl & XML)

3.9. Character Sets and Encodings (Perl & XML)

encodings, multiple-byte: 6.18.1. Problem (Perl Cookbook)

encodingspace( ) (SOAP::Lite): 14.2.1. SOAP::Lite Methods (Perl in a Nutshell)

encryption: 29.2.20. crypt (Programming Perl)

modules for: 32.1.12. Authentication, Security, and Encryption (Programming Perl)
Perl modules for: 22.1. The CPAN modules Directory (Programming Perl)

__END__; use of: 24.5.2. Generating Perl in Other Languages (Programming Perl)

end( ) Writer methods: 3.8. XML::Writer (Perl & XML)

END block

exit value of program, modifying: 18.7. Avant-Garde Compiler, Retro Interpreter (Programming Perl)

END blocks: 18.1. The Life Cycle of a Perl Program (Programming Perl)

order of running: 18.7. Avant-Garde Compiler, Retro Interpreter (Programming Perl)
skipping: 18.7. Avant-Garde Compiler, Retro Interpreter (Programming Perl)

=end command (pod): 4.13.1. Paragraph Tags (Perl in a Nutshell)

_ _END_ _ constant: 4.4.4. Global Special Constants (Perl in a Nutshell)

End handler (Expat): 13.3. Expat Handlers (Perl in a Nutshell)

end index

Entry widget: 21.8.1. Text Indexes (Perl in a Nutshell)
Listbox widget: 21.10.1. Listbox Indexes (Perl in a Nutshell)
Menu widget: 21.15.1. Menu Indexes (Perl in a Nutshell)
Text widget: 21.11.1. Text Indexes and Modifiers (Perl in a Nutshell)

end keyword: 12.1.2. Menu Indexes (Mastering Perl/Tk)

_ _END_ _ marker: 8.5. AutoLoader (Perl in a Nutshell)

end-of-file/end-of-input: 3.9. <STDIN> in List Context (Learning Perl)

bad filehandles and: 11.2.2. Bad Filehandles (Learning Perl)

end of string, matching: 5.6.2. Endings: The \z, \Z, and $ Assertions (Programming Perl)

=end pod directive: 12.16.3. Discussion (Perl Cookbook)

__END__ statement: 21.2.3. Square.pm (Mastering Perl/Tk)

end-tag token: 7.1. HTML as Tokens (Perl & LWP)

7.2.2. End-Tag Tokens (Perl & LWP)

end-tags, get_trimmed_text( ) method and: 7.5.4.2. End-tags (Perl & LWP)

__END__ token: 2.6.8. Other Literal Tokens (Programming Perl)

28.2. Special Variables in Alphabetical Order (Programming Perl)

__END__ tokens: 7.6.2. Solution (Perl Cookbook)

end_cdata( ) event handler: 5.1. SAX Event Handlers (Perl & XML)

5.7.2.3. Lexical event handlers (Perl & XML)

end_document( ) event handler: 5.1. SAX Event Handlers (Perl & XML)

5.7.2.1. Content event handlers (Perl & XML)

end_dtd( ) method: 5.7.2.3. Lexical event handlers (Perl & XML)

end_element( ) event handler: 5.1. SAX Event Handlers (Perl & XML)

5.7.2.1. Content event handlers (Perl & XML)

end_entity( ) event handler: 5.7.2.3. Lexical event handlers (Perl & XML)

endgrent( ): 5. Function Reference (Perl in a Nutshell)

endgrent function: 29.2.44. getgrent (Programming Perl)

endhostent( ): 5. Function Reference (Perl in a Nutshell)

29.2.49. gethostent (Programming Perl)

ending (see terminating)

ending escape sequences for character modification: 2.6.2. String Literals (Programming Perl)

endless loop (see infinite loops)

stopping: 2.10. The while Control Structure (Learning Perl)

endnetent( ): 5. Function Reference (Perl in a Nutshell)

endpoint( ) (SOAP::Lite): 14.2.1. SOAP::Lite Methods (Perl in a Nutshell)

end_prefix_mapping( ) method: 5.7.2.1. Content event handlers (Perl & XML)

endprotoent( ): 5. Function Reference (Perl in a Nutshell)

29.2.60. getprotoent (Programming Perl)

endpwent( ): 5. Function Reference (Perl in a Nutshell)

29.2.61. getpwent (Programming Perl)

<endrange>Win32 modules

Win32::ODBC module: 24.1. ODBC Methods and Properties (Perl in a Nutshell)

endservent( ): 5. Function Reference (Perl in a Nutshell)

29.2.66. getservent (Programming Perl)

endTag( ) Writer method: 3.8. XML::Writer (Perl & XML)

endtag( ) (HTML::Parser): 20.4.3. HTML::Element (Perl in a Nutshell)

English module: 8.63. English (Perl in a Nutshell)

7.1. Format Variables (Programming Perl)
32.1.13. Perl Language Extensions and Internals (Programming Perl)

enqueue method: 17.2.3.1. Queues (Programming Perl)

Enter event: 15.2.1.2. Event descriptor types (Mastering Perl/Tk)

entities: 1.6. XML Gotchas (Perl & XML)

2.5. Entities (Perl & XML)
DocumentType class (DOM): 7.2.3.1. Properties (Perl & XML)
external resolution: 5.3. External Entity Resolution (Perl & XML)
parsers and: 3.1. XML Parsers (Perl & XML)
resolve_entity( ) module and: 5.7.2.2. Entity resolver (Perl & XML)
well formed documents, checking: 3.1.1. Example (of What Not to Do): A Well-Formedness Checker (Perl & XML)

Entity handler (Expat): 13.3. Expat Handlers (Perl in a Nutshell)

Entity node: 6.1. XML Trees (Perl & XML)

7.2.14. EntityReference (Perl & XML)

entity references: 3.1. XML Parsers (Perl & XML)

entity_decl method for PerlSAX DTD handlers: 5.2. DTD Handlers (Perl & XML)

EntityReference class: 7.2.14. EntityReference (Perl & XML)

entity_reference SAX method: 5.1. SAX Event Handlers (Perl & XML)

Entry widget

arrows and units: 6.1. Defining Scrollbar Parts (Mastering Perl/Tk)

calling focus: 13.16. Focus Methods (Mastering Perl/Tk)

configuring: 5.2.11. Configuring an Entry Widget (Mastering Perl/Tk)

deleting text: 5.1.2. Label Options (Mastering Perl/Tk)

features: 5.1.2. Label Options (Mastering Perl/Tk)

Listbox scrolling example: 7.19. Listbox Example (Mastering Perl/Tk)

Scrollbars and: 6.1. Defining Scrollbar Parts (Mastering Perl/Tk)

6.4.1. Entry Widget (Mastering Perl/Tk)

validation and: 5.1.2. Label Options (Mastering Perl/Tk)

Entry widget (Perl/Tk): 21.8. The Entry Widget (Perl in a Nutshell)

entrycget( )

Menu widget: 21.15.2. Menu Methods (Perl in a Nutshell)
Menubutton widget: 21.14.2. Menubutton Methods (Perl in a Nutshell)

entrycget method: 12.1.4. Manipulating Menu Items (Mastering Perl/Tk)

entryconfigure( )

Menu widget: 21.15.2. Menu Methods (Perl in a Nutshell)
Menubutton widget: 21.14.2. Menubutton Methods (Perl in a Nutshell)

EnumerateRights( ) (Win32::FileSecurity): 22.6. Win32::FileSecurity (Perl in a Nutshell)

enumeration methods: 23.3. Win32::OLE::Enum (Perl in a Nutshell)

%ENV hash: 14.3. The Environment Variables (Learning Perl)

4.4.2. Global Special Arrays and Hashes (Perl in a Nutshell)
28.2. Special Variables in Alphabetical Order (Programming Perl)
deleting from: 29.2.24. delete (Programming Perl)
portability of: 25.4. System Interaction (Programming Perl)

Env module: 8.64. Env (Perl in a Nutshell)

32.1.13. Perl Language Extensions and Internals (Programming Perl)

env program, starting Perl with: 19.1. Command Processing (Programming Perl)

environment: Glossary (Programming Perl)

cleaning up: 23.1.2. Cleaning Up Your Environment (Programming Perl)

environment variables: 14.3. The Environment Variables (Learning Perl)

3.3. Environment Variables (Perl in a Nutshell)
19.2. Environment Variables (Programming Perl)
28.2. Special Variables in Alphabetical Order (Programming Perl)
Glossary (Programming Perl)
CGI-related: 9.4. CGI Environment Variables (Perl in a Nutshell)
DBI-related: 12.4. DBI Environment Variables (Perl in a Nutshell)
Env module: 32.1.13. Perl Language Extensions and Internals (Programming Perl)
modules, Perl use of: 19.2. Environment Variables (Programming Perl)
PERLDB_OPTS, setting debugger options with: 20.4. Unattended Execution (Programming Perl)
PERL_DESTRUCT_LEVEL: 12.6.1. Garbage Collection with DESTROY Methods (Programming Perl)
portability of: 25.4. System Interaction (Programming Perl)
shells vs. Perl: 24.1.4. Shell Traps (Programming Perl)
taint checking: 23.1. Handling Insecure Data (Programming Perl)

env_proxy( ) method: 3.4.6. Proxies (Perl & LWP)

env_proxy( ) (LWP::UserAgent): 20.2.3. LWP::UserAgent (Perl in a Nutshell)

eof( ): 5. Function Reference (Perl in a Nutshell)

1.6.2.1. The while and until statements (Programming Perl)
24.2.1. Time Efficiency (Programming Perl)
29.2.31. eof (Programming Perl)
HTML::Parser module: 20.4.1. HTML::Parser (Perl in a Nutshell)
tied filehandle, using on: 14.4.1. Filehandle-Tying Methods (Programming Perl)

EOF (end-of-file): Glossary (Programming Perl)

eparams( ) (URI::URL): 20.5.3. URI::URL (Perl in a Nutshell)

epath( ) (URI::URL): 20.5.3. URI::URL (Perl in a Nutshell)

Epoch: 3.2.1. Problem (Perl Cookbook)

11.6.1. The stat and lstat Functions (Learning Perl)

eq( ) method: 4.1.3. Comparison (Perl & LWP)

eq (equal to) operator: 4.5.4.2. Equality operators (Perl in a Nutshell)

eq operator: 24.1.1. Universal Blunders (Programming Perl)

eq( ) (URI::URL): 20.5.3. URI::URL (Perl in a Nutshell)

=> notation as comma equivalent: 1.3.3. Specifying Options (Mastering Perl/Tk)

equal method: 17.2.1.5. Identifying threads (Programming Perl)

equal sign (=)

assignment operator: 4.2.5. Variables (Perl in a Nutshell)

4.5.6. Assignment Operators (Perl in a Nutshell)

for embedded documentation (pod): 4.1. Program Structure (Perl in a Nutshell)

in hash name/value pairs: 4.2.5.2. Hashes (Perl in a Nutshell)

for pod commands: 4.13. Pod (Perl in a Nutshell)

== (equal to) operator: 4.5.4.2. Equality operators (Perl in a Nutshell)

=> operator, defining key/value pairs: 4.2.5.2. Hashes (Perl in a Nutshell)

4.5.11.3. Comma operator (Perl in a Nutshell)

=~ (pattern match) operator: 4.5.7. Pattern Match Operators (Perl in a Nutshell)

equal to (=) operator: 3.12. Equality Operators (Programming Perl)

equality operators: 4.5.4.2. Equality operators (Perl in a Nutshell)

3.12. Equality Operators (Programming Perl)

=> (comma arrow) operator: 5.0. Introduction (Perl Cookbook)

=~ operator, s///, m//, and tr/// with: 1.1.3. Discussion (Perl Cookbook)

equery( ) (URI::URL): 20.5.3. URI::URL (Perl in a Nutshell)

erasing (see deleting)

err( ) (DBI): 12.3. DBI Methods (Perl in a Nutshell)

errno: 28.2. Special Variables in Alphabetical Order (Programming Perl)

Glossary (Programming Perl)
Glossary (Programming Perl)

Errno module: 8.65. Errno (Perl in a Nutshell)

32.1.13. Perl Language Extensions and Internals (Programming Perl)

$ERRNO ($!) variable: 4.4.1. Global Special Variables (Perl in a Nutshell)

Error( )

(Win32::Internet): 22.7.1. General Internet Methods (Perl in a Nutshell)
(Win32::ODBC): 24.1. ODBC Methods and Properties (Perl in a Nutshell)
(Win32::Pipe): 22.13.1. Win32::Pipe Methods (Perl in a Nutshell)

error( ) exception handler: 5.7.2.4. Error event handlers and catching exceptions (Perl & XML)

error handlers for SAX: 5.7.2. SAX2 Handler Interface (Perl & XML)

error handling: 23.3.6. getOpenFile and getSaveFile Dialogs (Mastering Perl/Tk)

error messages: 2.4. Perl's Built-in Warnings (Learning Perl)

24.3. Programming with Style (Programming Perl)
33. Diagnostic Messages (Programming Perl)
printed by die function: 11.3. Fatal Errors with die (Learning Perl)
sending to a file: 11.5. Reopening a Standard Filehandle (Learning Perl)
standard output and: 14.4. Using Backquotes to Capture Output (Learning Perl)
user efficiency, improving with: 24.2.6. User Efficiency (Programming Perl)

error_as_HTML( ) (HTTP::Response): 20.3.2. HTTP::Response (Perl in a Nutshell)

ErrorDialog: 23.3.4. Using ErrorDialog (Mastering Perl/Tk)

errors: 11.3. Fatal Errors with die (Learning Perl)

29.2.38. fileno (Programming Perl)

33. Diagnostic Messages (Programming Perl)

Carp module: 32.3. Carp (Programming Perl)

CGI scripts: 19.0.2. Behind the Scenes (Perl Cookbook)

500 Server Error: 19.3.1. Problem (Perl Cookbook)
redirecting error messages: 19.2.1. Problem (Perl Cookbook)

CGI::Carp module, handling of: 32.5. CGI::Carp (Programming Perl)

controlling for other programs: 16.9.1. Problem (Perl Cookbook)

$@ variable for: 28.2. Special Variables in Alphabetical Order (Programming Perl)

$! variable for: 28.2. Special Variables in Alphabetical Order (Programming Perl)

$? variable for: 28.2. Special Variables in Alphabetical Order (Programming Perl)

exceptions in subroutines: 10.12.1. Problem (Perl Cookbook)

failed symbol exports: 11.2.1.3. Managing unknown symbols (Programming Perl)

insecure data: 23.1. Handling Insecure Data (Programming Perl)

number (errno): Glossary (Programming Perl)

out-of-memory errors: 28.2. Special Variables in Alphabetical Order (Programming Perl)

reading STDERR from programs: 16.7.1. Problem (Perl Cookbook)

reporting filenames in: 7.4.1. Problem (Perl Cookbook)

reporting like built-ins: 12.12.1. Problem (Perl Cookbook)

returning failure from subroutines: 10.10.1. Problem (Perl Cookbook)

subroutines: 6.2.2. Error Indications (Programming Perl)

trapping in require/use statements: 12.2.1. Problem (Perl Cookbook)

trapping undefined function calls: 10.15.1. Problem (Perl Cookbook)

warn function, producing error messages: 29.2.199. warn (Programming Perl)

web server error log: 19.0.2. Behind the Scenes (Perl Cookbook)

20.13.1. Problem (Perl Cookbook)

writing to httpd or other CGI errors logs: 32.1.9. World Wide Web (Programming Perl)

errstr( ) (DBI): 12.3. DBI Methods (Perl in a Nutshell)

ESC character: 2.6.2. String Literals (Programming Perl)

ESC in octal: 2.6.2. String Literals (Programming Perl)

escape sequences for control characters: 2.6.2. String Literals (Programming Perl)

escaped sequences: 4.6.3. Escaped Sequences (Perl in a Nutshell)

escape_from( ) (Mail::Internet): 16.2.5. Mail::Internet Reference (Perl in a Nutshell)

escaping chacters: 1.13.1. Problem (Perl Cookbook)

/etc/group file: 24.2.1. Time Efficiency (Programming Perl)

29.2.44. getgrent (Programming Perl)

/etc/hosts file: 29.2.49. gethostent (Programming Perl)

/etc/networks file: 29.2.53. getnetent (Programming Perl)

/etc/passwd file: 24.2.1. Time Efficiency (Programming Perl)

29.2.61. getpwent (Programming Perl)

/etc/protocols file: 29.2.60. getprotoent (Programming Perl)

/etc/services file: 29.2.66. getservent (Programming Perl)

/etc/utmp file: 29.2.50. getlogin (Programming Perl)

$EUID ($>) variable: 4.4.1. Global Special Variables (Perl in a Nutshell)

Ev method: 15.1. Creating a Callback (Mastering Perl/Tk)

15.2.5. Binding to a MouseWheel Event (Mastering Perl/Tk)

Ev subroutine: 23.1.2. Symbols Exported by Default (Mastering Perl/Tk)

eval( ): 5. Function Reference (Perl in a Nutshell)

eval {}, loop controls and: 4.5. Bare Blocks (Programming Perl)

eval {} operator: 3.1. Terms and List Operators (Leftward) (Programming Perl)

eval block: 17.1. Trapping Errors with eval (Learning Perl)

caution with: 17.1. Trapping Errors with eval (Learning Perl)

eval block, using XML::Parser module: 3.2.1. Example: Well-Formedness Checker Revisited (Perl & XML)

eval function: 8. References (Programming Perl)

24.2.1. Time Efficiency (Programming Perl)
29.2.32. eval (Programming Perl)
die function and: 29.2.25. die (Programming Perl)
loops and: 24.2.1. Time Efficiency (Programming Perl)
packages and: 10. Packages (Programming Perl)
restricted (reval): 23.3.1.1. Restricting namespace access (Programming Perl)
translating with variables: 5.2.4. The tr/// Operator (Transliteration) (Programming Perl)
threads, catching exceptions with: 17.2.1.3. Catching exceptions from join (Programming Perl)

$EVAL_ERROR: 28.2. Special Variables in Alphabetical Order (Programming Perl)

$EVAL_ERROR ($@) variable: 4.4.1. Global Special Variables (Perl in a Nutshell)

eval_sv and eval_pv functions: 21.4.4. Evaluating a Perl Statement from C (Programming Perl)

event-based parsing: 13.3. Expat Handlers (Perl in a Nutshell)

event descriptor: 15.2.1.2. Event descriptor types (Mastering Perl/Tk)

event handlers (see handlers)

event handling: 1.3.6. The Event Loop (Mastering Perl/Tk)

21.1.3.6. Tk::Square event handler (Mastering Perl/Tk)

event loops

after method and: 13.2.2. Name of a Widget (Mastering Perl/Tk)
coexisting: 15.9. Coexisting with Other GUI Main Loops (Mastering Perl/Tk)
defined: 15. Anatomy of the MainLoop (Mastering Perl/Tk)
purpose: 1.3.6. The Event Loop (Mastering Perl/Tk)

event object: 15.2.2. The Event Structure (Mastering Perl/Tk)

event processing (parser): 3.3. Stream-Based Versus Tree-Based Processing (Perl & XML)

stream parsing styles and: 3.2.2. Parsing Styles (Perl & XML)

event streams: 4. Event Streams (Perl & XML)

applications: 4.4. Stream Applications (Perl & XML)
handlers: 4.2. Events and Handlers (Perl & XML)
working with: 4.1. Working with Streams (Perl & XML)
XML processing strategies and: 3.3. Stream-Based Versus Tree-Based Processing (Perl & XML)
XML::Parser module and: 4.6. XML::Parser (Perl & XML)

event structure: 15.2.2. The Event Structure (Mastering Perl/Tk)

event subroutine: 23.1.3. Optionally Exported Symbols (Mastering Perl/Tk)

event types: 15. Anatomy of the MainLoop (Mastering Perl/Tk)

15.2. Binding to Events (Mastering Perl/Tk)
15.2.1.2. Event descriptor types (Mastering Perl/Tk)

eventDelete method: 15.8. Synthesizing Virtual Events (Mastering Perl/Tk)

eventGenerate method: 15.2.1. Event Descriptor Syntax (Mastering Perl/Tk)

15.8. Synthesizing Virtual Events (Mastering Perl/Tk)

eventInfo method: 15.8. Synthesizing Virtual Events (Mastering Perl/Tk)

events: 4.2. Events and Handlers (Perl & XML)

binding to: 15.2. Binding to Events (Mastering Perl/Tk)
callbacks and: 1.1. Perl/Tk Concepts (Mastering Perl/Tk)
defined: 1.3.6. The Event Loop (Mastering Perl/Tk)
waiting for: 13.21. Waiting for Events to Happen (Mastering Perl/Tk)

events, Tk resize: 15.16.1. Problem (Perl Cookbook)

:eventtypes tag: 15. Anatomy of the MainLoop (Mastering Perl/Tk)

23.1.4. Exporter Tags (Mastering Perl/Tk)

example Perl scripts: 2.3.1.1. Perl examples (Perl in a Nutshell)

Excel spreadsheets, converting to XML: 5.4. Drivers for Non-XML Sources (Perl & XML)

exceptions: Glossary (Programming Perl)

intercepting: 28.2. Special Variables in Alphabetical Order (Programming Perl)
in detached child threads: 17.2.1.4. The detach method (Programming Perl)
die function and: 29.2.25. die (Programming Perl)
fatal errors, causing: Glossary (Programming Perl)
functions raising: 29.2. Perl Functions in Alphabetical Order (Programming Perl)
handling in subroutines: 10.12.1. Problem (Perl Cookbook)
insecure data: 23.1. Handling Insecure Data (Programming Perl)
modules for: 32.1.15. Warnings and Exceptions (Programming Perl)
raising on failure: 32.1.13. Perl Language Extensions and Internals (Programming Perl)
raising to indicate subroutine errors: 6.2.2. Error Indications (Programming Perl)
threads, catching: 17.2.1.3. Catching exceptions from join (Programming Perl)
trapping: 29.2.32. eval (Programming Perl)
trapping undefined function calls: 10.15.1. Problem (Perl Cookbook)

$EXCEPTIONS_BEING_CAUGHT: 28.2. Special Variables in Alphabetical Order (Programming Perl)

exclamation point (!) 2.4.4. Installing Modules with the CPAN Module (Perl in a Nutshell)

as bang: 1.3.1. Do You Need To Install Anything? (Mastering Perl/Tk)

1.3.1. Do You Need To Install Anything? (Mastering Perl/Tk)

operator used with tags: 9.9. Tags (Mastering Perl/Tk)

9.9. Tags (Mastering Perl/Tk)

exclusive file locks: 16.2.1. File Locking (Programming Perl)

obtaining: 16.2.1. File Locking (Programming Perl)

exclusive locks: 7.11.3. Discussion (Perl Cookbook)

exclusive or (xor) operator: 3.13. Bitwise Operators (Programming Perl)

3.20. Logical and, or, not, and xor (Programming Perl)

exec( ): 5. Function Reference (Perl in a Nutshell)

16.0.1. Process Creation (Perl Cookbook)
16.3.2. Solution (Perl Cookbook)
19.6.3. Discussion (Perl Cookbook)
14.2. The exec Function (Learning Perl)
29.2.33. exec (Programming Perl)
Glossary (Programming Perl)
filehandles, leaving open across calls: 16.2.2. Passing Filehandles (Programming Perl)
list argument form, avoiding shell with: 23.3.2. Code Masquerading as Data (Programming Perl)
portability of: 25.5. Interprocess Communication (IPC) (Programming Perl)

executable files: Glossary (Programming Perl)

executable image file: 18.1. The Life Cycle of a Perl Program (Programming Perl)

$EXECUTABLE_NAME: 28.2. Special Variables in Alphabetical Order (Programming Perl)

$EXECUTABLE_NAME ($^X) variable: 4.4.1. Global Special Variables (Perl in a Nutshell)

execute bit: Glossary (Programming Perl)

execute( ) (DBI): 12.3. DBI Methods (Perl in a Nutshell)

executing

code: 18.3. Executing Your Code (Programming Perl)
code, conditionally: 1.5.5. Logical Operators (Programming Perl)
methods: 12.3. Method Invocation (Programming Perl)
other programs from Perl: 29.2.174. system (Programming Perl)
Perl program: 1.3.1. How to Do It (Programming Perl)
Perl programs: 19.1. Command Processing (Programming Perl)

execution

code, order of: 18.7. Avant-Garde Compiler, Retro Interpreter (Programming Perl)
Perl programs: 18.1. The Life Cycle of a Perl Program (Programming Perl)
unattended, debugger: 20.4. Unattended Execution (Programming Perl)

execv function (in C): 29.2.33. exec (Programming Perl)

execvp function (in C): 29.2.33. exec (Programming Perl)

exercises in this book: 1.1.3. What About the Exercises and Their Answers? (Learning Perl)

answers to: A. Exercise Answers (Learning Perl)

existence, of a process: 16.1.1. Signaling Process Groups (Programming Perl)

exists( ): 5. Function Reference (Perl in a Nutshell)

5.1.3. Discussion (Perl Cookbook)
5.4.1. The exists Function (Learning Perl)
29.2.34. exists (Programming Perl)
invoking on hash: 14.3.1. Hash-Tying Methods (Programming Perl)
multiple hash key values: 5.7.3. Discussion (Perl Cookbook)
News::Newsrc module: 17.3.1. News::Newsrc Reference (Perl in a Nutshell)

Exists method: 13.6. Widget Existence (Mastering Perl/Tk)

Exists subroutine: 23.1.2. Symbols Exported by Default (Mastering Perl/Tk)

exit( ): 5. Function Reference (Perl in a Nutshell)

11.4. Running CGI Scripts with mod_perl (Perl in a Nutshell)
29.2.35. exit (Programming Perl)
29.2.40. fork (Programming Perl)
threads and: 17.2.1.2. Thread destruction (Programming Perl)

exit status: 11.3. Fatal Errors with die (Learning Perl)

28.2. Special Variables in Alphabetical Order (Programming Perl)

exit subroutine: 1.4.1. exit Versus destroy (Mastering Perl/Tk)

4.9. The -command Option (Mastering Perl/Tk)
23.1.2. Symbols Exported by Default (Mastering Perl/Tk)

exiting

debugger: 20.3.3. Debugger Options (Programming Perl)
if or unless blocks: 4.5. Bare Blocks (Programming Perl)
infinite loop: 4.4.2. for Loops (Programming Perl)
once-through blocks: 4.5. Bare Blocks (Programming Perl)
Perl debugger: 20.2.7. Miscellaneous Commands (Programming Perl)

exiting programs: 1.1. Getting Started (Programming Perl)

exp( ): 5. Function Reference (Perl in a Nutshell)

29.2.36. exp (Programming Perl)

expand( ) (Net::SMTP): 16.1.2.1. Net::SMTP methods (Perl in a Nutshell)

-expand option (pack geometry manager): 21.2.1. The pack Geometry Manager (Perl in a Nutshell)

expanding tabs: 1.7.1. Problem (Perl Cookbook)

expanding variables in user input: 1.8.1. Problem (Perl Cookbook)

expansion, filename: 29.2.69. glob (Programming Perl)

Expat: 13.1. XML Parsing and Validation (Perl in a Nutshell)

handlers: 13.3. Expat Handlers (Perl in a Nutshell)

Expat parser library: 3.2. XML::Parser (Perl & XML)

using parsers and: 3.4. Putting Parsers to Work (Perl & XML)

Expect: 22.1. The CPAN modules Directory (Programming Perl)

controlling programs with: 15.13.1. Problem (Perl Cookbook)

Expect module: 15.13.1. Problem (Perl Cookbook)

16.3.3. Bidirectional Communication (Programming Perl)

explicit method invocations: 12.3. Method Invocation (Programming Perl)

expn program (example): 18.9. Program: expn and vrfy (Perl Cookbook)

exponential notation: 2.6.1. Numeric Literals (Programming Perl)

exponentiation (**) operator: 4.5.3. Arithmetic Operators (Perl in a Nutshell)

3.4. Exponentiation (Programming Perl)
2.2.5. Numeric Operators (Learning Perl)

exponentiation of integers: 21.4.5. Fiddling with the Perl Stack from C (Programming Perl)

@EXPORT array: 28.2. Special Variables in Alphabetical Order (Programming Perl)

@EXPORT array (use pragma): 12.1.3. Discussion (Perl Cookbook)

Exporter: 21.3.2. Creating Extensions (Programming Perl)

Exporter module: 12.0.2. Import/Export Regulations (Perl Cookbook)

12.1.1. Problem (Perl Cookbook)
8.66. Exporter (Perl in a Nutshell)
32.1.17. Module Installation Support (Programming Perl)
15.3.2. bindDump—Dump Lots of Binding Information (Mastering Perl/Tk)
module privacy and: 11.2.1. Module Privacy and the Exporter (Programming Perl)

export_fail method: 11.2.1.3. Managing unknown symbols (Programming Perl)

exporting: 11. Modules (Programming Perl)

exporting symbols: 11.2. Creating Modules (Programming Perl)

11.2.1. Module Privacy and the Exporter (Programming Perl)
Glossary (Programming Perl)
without using import method from Exporter: 11.2.1.1. Exporting without using Exporter's import method (Programming Perl)

exporting to modules: 12.0.2. Import/Export Regulations (Perl Cookbook)

@EXPORT_OK array: 28.2. Special Variables in Alphabetical Order (Programming Perl)

@EXPORT_OK array (use pragma): 12.1.3. Discussion (Perl Cookbook)

-exportselection option (widgets): 21.3. Common Widget Configuration Options (Perl in a Nutshell)

@EXPORT_TAGS array (use pragma): 12.1.3. Discussion (Perl Cookbook)

%EXPORT_TAGS hash: 28.2. Special Variables in Alphabetical Order (Programming Perl)

export_to_level method: 11.2.1.1. Exporting without using Exporter's import method (Programming Perl)

Expose event: 15.2.1.2. Event descriptor types (Mastering Perl/Tk)

expressions: 6. Simple HTML Processing with Regular Expressions (Perl & LWP)

Glossary (Programming Perl)
context and: 3.8. Scalar and List Context (Learning Perl)
EXPR and LIST: 4.2. Compound Statements (Programming Perl)
interpolating within strings: 1.10.1. Problem (Perl Cookbook)
loops, separating with commas (,): 4.4.2. for Loops (Programming Perl)
modifiers for: 10.3. Expression Modifiers (Learning Perl)
multiple, in loops: 4.4.2. for Loops (Programming Perl)
Perl, supplying in replacement strings: 5.10.3. Programmatic Patterns (Programming Perl)

expressions (XPath): 8.2. XPath (Perl & XML)

EXPRs: 4.2. Compound Statements (Programming Perl)

goto operator, use with: 4.6. goto (Programming Perl)

extended regular expression syntax: 4.6.8. Extended Regular Expressions (Perl in a Nutshell)

$EXTENDED_OS_ERROR: 28.2. Special Variables in Alphabetical Order (Programming Perl)

$EXTENDED_OS_ERROR ($^E) variable: 4.4.1. Global Special Variables (Perl in a Nutshell)

extending arrays: 2.8.2. Array Length (Programming Perl)

extending Perl: 21.3. Extending Perl (Using C from Perl) (Programming Perl)

extensions, creating: 21.3.2. Creating Extensions (Programming Perl)

32.1.13. Perl Language Extensions and Internals (Programming Perl)
Glossary (Programming Perl)

using functions from external C libraby: 21.3.4. Using Functions from an External C Library (Programming Perl)

XSUB input and output: 21.3.3. XSUB Input and Output (Programming Perl)

XSUBs and XS language, wrapping Perl in: 21.3.1. XS and XSUBs (Programming Perl)

extend_lock method: 19.5.3. Locking an SDB File (Mastering Perl/Tk)

Extensible Markup Language (see XML)

extensions: 20.3. TclRobots (Mastering Perl/Tk)

21.2.2. Square.xs (Mastering Perl/Tk)
21.2.2. Square.xs (Mastering Perl/Tk)

external entity resolution: 5.3. External Entity Resolution (Perl & XML)

external subroutines, portability of: 25.6. External Subroutines (XS) (Programming Perl)

external subsets: 2.5. Entities (Perl & XML)

ExternEnt handler (Expat): 13.3. Expat Handlers (Perl in a Nutshell)

ExternEntFin handler (Expat): 13.3. Expat Handlers (Perl in a Nutshell)

extra path information: 9.3. Extra Path Information (Perl in a Nutshell)

extract_cookies( ) (HTTP::Cookies): 20.3.6. HTTP::Cookies (Perl in a Nutshell)

extracted text, uses: 7.6. Using Extracted Text (Perl & LWP)

extracting data: 1.1.2. Brittleness (Perl & LWP)

regular expressions: 6.1. Automating Data Extraction (Perl & LWP)

extracting from arrays (see arrays)

extracting links, link-checking spider example: 12.3.5. Link Extraction (Perl & LWP)

extracting Perl source code: 2.3.2.2. Standard Perl distribution (Perl in a Nutshell)

extracting substrings: 29.2.168. substr (Programming Perl)

extracting URLs from HTML: 20.3. Extracting URLs (Perl Cookbook)

extract_links( ) (HTML::Parser): 20.4.3. HTML::Element (Perl in a Nutshell)

ExtUtils modules: 8.67. ExtUtils::Command (Perl in a Nutshell)

ExtUtils::Command::MM module: 8.68. ExtUtils::Command::MM (Perl in a Nutshell)
ExtUtils::Constant module: 8.69. ExtUtils::Constant (Perl in a Nutshell)
ExtUtils::MM module: 8.79. ExtUtils::MM (Perl in a Nutshell)
ExtUtils::MM_Any module: 8.80. ExtUtils::MM_Any (Perl in a Nutshell)
ExtUtils::MM_BeOS module: 8.81. ExtUtils::MM_BeOS (Perl in a Nutshell)
ExtUtils::MM_DOS: 8.82. ExtUtils::MM_DOS (Perl in a Nutshell)
ExtUtils::MM_NW5: 8.83. ExtUtils::MM_NW5 (Perl in a Nutshell)
ExtUtils::MM_UWIN: 8.86. ExtUtils::MM_UWIN (Perl in a Nutshell)
ExtUtils::MY: 8.89. ExtUtils::MY (Perl in a Nutshell)
ExtUtils::Command module: 8.67. ExtUtils::Command (Perl in a Nutshell)
ExtUtils::Embed module: 8.70. ExtUtils::Embed (Perl in a Nutshell)
ExtUtils::Install module: 8.71. ExtUtils::Install (Perl in a Nutshell)
ExtUtils::Installed module: 8.72. ExtUtils::Installed (Perl in a Nutshell)
ExtUtils::Liblist module: 8.73. ExtUtils::Liblist (Perl in a Nutshell)
ExtUtils::MakeMaker module: 8.74. ExtUtils::MakeMaker (Perl in a Nutshell)
ExtUtils::Manifest module: 8.75. ExtUtils::Manifest (Perl in a Nutshell)
ExtUtils::Miniperl module: 8.76. ExtUtils::Miniperl (Perl in a Nutshell)
ExtUtils::Mkbootstrap module: 8.77. ExtUtils::Mkbootstrap (Perl in a Nutshell)
ExtUtils::Mksymlists module: 8.78. ExtUtils::Mksymlists (Perl in a Nutshell)
ExtUtils::MM_OS2 module: 8.84. ExtUtils::MM_OS2 (Perl in a Nutshell)
ExtUtils::MM_Unix module: 8.85. ExtUtils::MM_Unix (Perl in a Nutshell)
ExtUtils::MM_VMS module: 8.87. ExtUtils::MM_VMS (Perl in a Nutshell)
ExtUtils::MM_WIN32 module: 8.88. ExtUtils::MM_Win32 (Perl in a Nutshell)
ExtUtils::Packlist module: 8.90. ExtUtils::Packlist (Perl in a Nutshell)
ExtUtils::testlib module: 8.91. ExtUtils::testlib (Perl in a Nutshell)

ExtUtils::Command module: 32.1.17. Module Installation Support (Programming Perl)

ExtUtils::Embed module: 21.4.1. Compiling Embedded Programs (Programming Perl)

32.1.17. Module Installation Support (Programming Perl)

ExtUtils::Install module: 32.1.17. Module Installation Support (Programming Perl)

ExtUtils::Installed module: 32.1.17. Module Installation Support (Programming Perl)

ExtUtils::Liblist module: 32.1.17. Module Installation Support (Programming Perl)

ExtUtils::MakeMaker: 22.3. Creating CPAN Modules (Programming Perl)

22.3. Creating CPAN Modules (Programming Perl)
(see also MakeMaker)

ExtUtils::MakeMaker module: 32.1.17. Module Installation Support (Programming Perl)

ExtUtils::Manifest module: 32.1.17. Module Installation Support (Programming Perl)

ExtUtils::Mkbootstrap module: 32.1.17. Module Installation Support (Programming Perl)

ExtUtils::Mksymlists module: 32.1.17. Module Installation Support (Programming Perl)

ExtUtils::MM_Cygwin module: 32.1.17. Module Installation Support (Programming Perl)

ExtUtils::MM_OS2 module: 32.1.17. Module Installation Support (Programming Perl)

ExtUtils::MM_Unix module: 32.1.17. Module Installation Support (Programming Perl)

ExtUtils::MM_VMS module: 32.1.17. Module Installation Support (Programming Perl)

ExtUtils::MM_Win32 module: 32.1.17. Module Installation Support (Programming Perl)

ExtUtils::Packlist module: 32.1.17. Module Installation Support (Programming Perl)

ExtUtils::testlib module: 32.1.17. Module Installation Support (Programming Perl)

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