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# Index: E

-e file test operator
  Learning Perl, 10.5. The -x File Tests
  Learning Perl on Win32 Systems, 10.6. The -x File Tests
  Perl in a Nutshell, 4.5.8. File Test Operators
  Programming Perl, 2.5.10. Named Unary and File Test Operators
E<> interior sequence (pod) : Perl in a Nutshell, 4.11.2. Interior sequences
-E option (dprofpp) : Perl in a Nutshell, 6.5. The Perl Profiler
-e option (perlbug) : Perl in a Nutshell, 6.6. The perlbug Program
-e option (perlcc) : Perl in a Nutshell, 3.4. The Perl Compiler
/e pattern-match modifier
  Advanced Perl Programming, 5.4.1. Expression Evaluation in Substitutions
  Perl Cookbook, 1.8. Expanding Variables in User Input
  Perl Cookbook, 6.0. Introduction
  Perl Cookbook, 6.4. Commenting Regular Expressions
  Perl Cookbook, 7.7. Writing a Filter
  Learning Perl, D.5.2. The eval Operator (and s///e)
  Programming Perl, 2.4.2. Pattern-Matching Operators
\e (escape) sequence : Perl in a Nutshell, 4.6.3. Escaped Sequences
\E string metacharacter : Perl Cookbook, 1.13. Escaping Characters
-e switch, perl
  Advanced Perl Programming, 5.1. The String Form: Expression Evaluation
  Learning Perl, 17.5. Variable-Length (Text) Databases
  Perl in a Nutshell, 3.2. Command-Line Options
  Programming Perl, 6.1.2. Switches
each()
  Perl Cookbook, 5.10. Merging Hashes
  Learning Perl, 5.4.3. The each Function
  Perl in a Nutshell, Chapter 5, Reference: each
  Programming Perl, 3.2.30. each
  Programming Perl, 5.4.3. Tying Hashes
  examples of
    Learning Perl, A.16. Chapter 17, User Database Manipulation
    Learning Perl, 17.3. Using a DBM Hash
    Learning Perl on Win32 Systems, 17.3. Using a DBM Hash
eager pattern matching : Perl Cookbook, 6.0. Introduction
ebcdic() (Net::FTP) : Perl in a Nutshell, Chapter 16, Reference: ebcdic
echo command
  globbing and : Learning Perl, 12.2. Globbing
  password input : Perl Cookbook, 15.10. Reading Passwords
editing files : (see file contents)
editing input : Perl Cookbook, 15.11. Editing Input
editor support for debugger : Programming Perl, 8.1.5. Editor Support for Debugging
editors, and updating databases : Learning Perl, 17.5. Variable-Length (Text) Databases
/ee substitution modifier
  Perl Cookbook, 1.8. Expanding Variables in User Input
  Perl Cookbook, 6.4. Commenting Regular Expressions
effective gid : (see $ variables, $) variable)
effective uid : (see $ variables, $< variable)
$EFFECTIVE_GROUP_ID ($)) variable
  Perl in a Nutshell, 4.4.1. Global Special Variables
  Programming Perl, 2.9.3. Global Special Variables
  Programming Perl, 7.2.13. English - Use English or awk Names for Punctuation Variables
$EFFECTIVE_USER_ID ($>) variable
  Perl in a Nutshell, 4.4.1. Global Special Variables
  Programming Perl, 2.9.3. Global Special Variables
  Programming Perl, 7.2.13. English - Use English or awk Names for Punctuation Variables
efficiency : (see performance)
$EGID ($() variable
  Perl in a Nutshell, 4.4.1. Global Special Variables
  Programming Perl, 2.9.3. Global Special Variables
  Programming Perl, 7.2.13. English - Use English or awk Names for Punctuation Variables
element references : Advanced Perl Programming, 1.6.2. Array/Hash References Versus Element References
-elementborderwidth option (Scrollbar) : Perl in a Nutshell, 18.9. The Scrollbar Widget
elements of array
  Learning Perl, 3.1. What Is a List or Array?
  Learning Perl on Win32 Systems, 3.1. What Is a List or Array?
elements of arrays : (see arrays)
elements of hashes : (see hashes)
else keyword : (see if statement)
elsif keyword
  (see also if statement)
  Learning Perl, 1.5.5. More than One Secret Word
  Learning Perl, 4.2. The if/unless Statement
  Learning Perl on Win32 Systems, 1.6.5. More than One Secret Word
  Learning Perl on Win32 Systems, 4.2. The if/unless Statement
  examples of
    Learning Perl, A.3. Chapter 4, Control Structures
    Learning Perl, 15.4. Advanced Sorting
    Learning Perl on Win32 Systems, A.3. Chapter 4, Control Structures
    Learning Perl on Win32 Systems, 15.4. Advanced Sorting
Emacs, debugger and : Programming Perl, 8.1.5. Editor Support for Debugging
email : Perl in a Nutshell, 14. Email Connectivity
  folders for (Mail::Folder module) : Perl in a Nutshell, 14.2.3. Handle Folders with Mail::Folder
  handling messages (Mail::Internet module)
    Learning Perl, 9.1. The last Statement
    Perl in a Nutshell, 14.2.4. Handle Messages with Mail::Internet
  header control (Mail::Send module) : Perl in a Nutshell, 14.2.2. Better Header Control with Mail::Send
  Mail modules
    Perl in a Nutshell, 14. Email Connectivity
    Perl in a Nutshell, 14.2. The Mail Modules
  matching valid addresses : Perl Cookbook, 6.19. Matching a Valid Mail Address
  parsing addresses (Mail::Address module) : Perl in a Nutshell, 14.2.6. Parse Email Addresses with Mail::Address
  Perl-related mailing lists : Perl in a Nutshell, 1.4.3. Mailing Lists
  random signatures : Perl Cookbook, 16.22. Program: sigrand
  reading with POP3
    Perl Cookbook, 18.5. Reading Mail with POP3
    Perl in a Nutshell, 14.1.3. Retrieving Email with Net::POP3
    Perl in a Nutshell, 14.2.8. Reading Email with Mail::POP3Client
  sending
    Perl Cookbook, 18.3. Sending Mail
    Perl in a Nutshell, 14.1.1. Send Email with Net::SMTP
    Perl in a Nutshell, 14.2.1. Send Email with Mail::Mailer
  sending HTML forms via : Perl Cookbook, 19.13. Saving a Form to a File or Mail Pipe
  sorting (example subroutine) : Perl Cookbook, 10.17. Program: Sorting Your Mail
  tracking time path of : Perl Cookbook, 3.11. Program: hopdelta
Embed module : Advanced Perl Programming, 19.4. Adding Extensions
embedding Perl
  Advanced Perl Programming, 19. Embedding Perl:The Easy Way
  Advanced Perl Programming, 20.6. Easy Embedding API
  Learning Perl, 19.10.2. Embedded Perl
  Learning Perl on Win32 Systems, D.10. Embeddible, Extensible
  macros for : Advanced Perl Programming, 20.4.1. Calling a Perl Subroutine
  in messages : Perl in a Nutshell, 3.2. Command-Line Options
emit_open_file procedure : Advanced Perl Programming, 17.4.2. Template Parser
emit_opening_statement procedure : Advanced Perl Programming, 17.4.2. Template Parser
empty array : Learning Perl, 3.2. Literal Representation
empty base class test : Perl Cookbook, 13.9. Writing an Inheritable Class
empty list : Learning Perl, 3.2. Literal Representation
  clearing out a hash : Learning Perl, 5.4.2. The values Function
  as default value for array variable : Learning Perl, 3.3. Variables
  getpwent() return value : Learning Perl, 16.1. Getting Password and Group Information
empty string ("") : Perl Cookbook, 1.0. Introduction
enablecache() routine : Programming Perl, 7.2.4. Benchmark - Check and Compare Running Times of Code
encapsulation
  Advanced Perl Programming, 7.1. OO: An Introduction
  Advanced Perl Programming, 7.2.8. Accessor Methods
  Advanced Perl Programming, 11.2.2. Object Encapsulation
  Programming Perl, 4.3.4. Using Object Methods
encoding URLs : Perl in a Nutshell, 9.2. URL Encoding
encodings, multiple-byte : Perl Cookbook, 6.18. Matching Multiple-Byte Characters
encryption
  Programming Perl, 3.2.22. crypt
  Programming Perl, 6.3.2.2. Penguin
End() (Response object, PerlScript) : Perl in a Nutshell, 20.2.2.3. Response methods
END block
  Advanced Perl Programming, 6.3. Package Initialization and Destruction
  Programming Perl, 5.1.2. Package Constructors and Destructors: BEGIN and END
=end command (pod) : Perl in a Nutshell, Chapter 4, Reference: =end
end index
  Entry widget : Perl in a Nutshell, 18.8.1. Text Indexes
  Listbox widget : Perl in a Nutshell, 18.10.1. Listbox Indexes
  Menu widget : Perl in a Nutshell, 18.15.1. Menu Indexes
  Text widget : Perl in a Nutshell, 18.11.1. Text Indexes and Modifiers
end of file : Programming Perl, 3.2.31. eof
  Control-D as : Learning Perl, 3.6. <STDIN> as an Array
  detecting
    Learning Perl, 1.5.10. Moving the Secret Word List into a Separate File
    Learning Perl on Win32 Systems, 1.6.10. Moving the Secret Word List into a Separate File
  with Control-D : Learning Perl on Win32 Systems, 3.6. <STDIN> as an Array
=end pod directive : Perl Cookbook, 12.16. Documenting Your Module with Pod
__END__ token
  Perl Cookbook, 7.6. Storing Files Inside Your Program Text
  Perl in a Nutshell, 4.4.4. Global Special Constants
  Programming Perl, 2.3.2.7. Other literal tokens
  Programming Perl, 2.9.5. Global Special Filehandles
end tokens : Learning Perl, 19.3. Simplest CGI Program
endgrent()
  Learning Perl, 16.1. Getting Password and Group Information
  Perl in a Nutshell, Chapter 5, Reference: endgrent
  Programming Perl, 3.2.44. getgrent
endhostent()
  Perl in a Nutshell, Chapter 5, Reference: endhostent
  Programming Perl, 3.2.49. gethostent
ending : (see terminating)
endless loop : (see infinite loops)
endnetent() : Perl in a Nutshell, Chapter 5, Reference: endnetent
endprotoent()
  Perl in a Nutshell, Chapter 5, Reference: endprotoent
  Programming Perl, 3.2.60. getprotoent
endpwent()
  Learning Perl, 16.1. Getting Password and Group Information
  Perl in a Nutshell, Chapter 5, Reference: endpwent
  Programming Perl, 3.2.61. getpwent
endservent()
  Perl in a Nutshell, Chapter 5, Reference: endservent
  Programming Perl, 3.2.66. getservent
endtag() (HTML::Parser) : Perl in a Nutshell, Chapter 17, Reference: endtag
English module
  Perl in a Nutshell, 8.45. English
  Programming Perl, 7.2.76. vars - Predeclare Global Variable Names
  Programming Perl, 8.2.3. Awk Traps
Entry widgets (Perl/Tk)
  Advanced Perl Programming, A.3. Entry
  Advanced Perl Programming, 14.3.5.5. The entry widget
  Perl in a Nutshell, 18.8. The Entry Widget
entrycget()
  Menu widget : Perl in a Nutshell, 18.15.2. Menu Methods
  Menubutton widget : Perl in a Nutshell, 18.14.2. Menubutton Methods
entryconfigure()
  Menu widget : Perl in a Nutshell, 18.15.2. Menu Methods
  Menubutton widget : Perl in a Nutshell, 18.14.2. Menubutton Methods
EnumerateRights() (Win32::FileSecurity) : Perl in a Nutshell, Chapter 19, Reference: EnumerateRights
%ENV hash
  Learning Perl, 14.1. Using system and exec
  Perl in a Nutshell, 4.4.2. Global Special Arrays and Hashes
  Programming Perl, 2.9.4. Global Special Arrays
  deleting from : Programming Perl, 3.2.26. delete
Env module
  Advanced Perl Programming, 6.5.1. How Do use and Exporter Work?
  Advanced Perl Programming, 9.3. Tying Hashes
  Perl in a Nutshell, 8.46. Env
  Programming Perl, 7.2.14. Env - Import Environment Variables
env_proxy() (LWP::UserAgent) : Perl in a Nutshell, Chapter 17, Reference: env_proxy
environment variables
  Perl in a Nutshell, 3.3. Environment Variables
  Programming Perl, 2.9.4. Global Special Arrays
  CGI-related : Perl in a Nutshell, 9.4. CGI Environment Variables
  controlling through %ENV : Learning Perl, 14.1. Using system and exec
  DBI-related : Perl in a Nutshell, 12.4. DBI Environment Variables
  importing : Programming Perl, 7.2.14. Env - Import Environment Variables
eof
  Learning Perl, 19.8.2. Objects in CGI.pm
  Perl in a Nutshell, Chapter 5, Reference: eof
  Programming Perl, 3.2.31. eof
  Programming Perl, 8.3.1. Time Efficiency
  HTML::Parser module : Perl in a Nutshell, Chapter 17, Reference: eof
eparams() (URI::URL) : Perl in a Nutshell, Chapter 17, Reference: eparams
epath() (URI::URL) : Perl in a Nutshell, Chapter 17, Reference: epath
Epoch : (see date and time)
eq (equal to) operator
  Learning Perl, 2.4.2. Operators for Strings
  Perl in a Nutshell, 4.5.4.2. Equality operators
  Programming Perl, 8.2.1. Universal Blunders
  examples of
    Learning Perl, 1.5.3. Adding Choices
    Learning Perl, 1.5.17. The Final Programs
    Learning Perl on Win32 Systems, 1.6.3. Adding Choices
    Learning Perl on Win32 Systems, 1.6.17. The Final Programs
eq() (URI::URL) : Perl in a Nutshell, Chapter 17, Reference: eq
equal sign : (see = (equal sign))
equality operators
  Perl in a Nutshell, 4.5.4.2. Equality operators
  Programming Perl, 2.5.12. Equality Operators
equery() (URI::URL) : Perl in a Nutshell, Chapter 17, Reference: equery
erasing : (see deleting)
err() (DBI) : Perl in a Nutshell, Chapter 12, Reference: err
Errno module : Perl in a Nutshell, 8.47. Errno
$ERRNO ($!) variable
  Perl in a Nutshell, 4.4.1. Global Special Variables
  Programming Perl, 2.9.3. Global Special Variables
  Programming Perl, 7.2.13. English - Use English or awk Names for Punctuation Variables
Error() (Win32::Internet) : Perl in a Nutshell, Chapter 19, Reference: Error
error messages
  Programming Perl, 7.2.5. Carp - Generate Error Messages
  Programming Perl, 8.3.6. User Efficiency
  Programming Perl, 8.4. Programming with Style
  Programming Perl, 9. Diagnostic Messages
Error module : Learning Perl on Win32 Systems, B.4. Win32 Extensions
error_as_HTML() (HTTP::Response) : Perl in a Nutshell, Chapter 17, Reference: error_as_HTML
errors
  (see also exceptions)
  Advanced Perl Programming, 5.2. The Block Form: Exception Handling
  Programming Perl, 9. Diagnostic Messages
  $@ variable for : Programming Perl, 2.9.3. Global Special Variables
  $! variable for : Programming Perl, 2.9.3. Global Special Variables
  $? variable for : Programming Perl, 2.9.3. Global Special Variables
  CGI scripts
    Perl Cookbook, 19.0. Introduction
    Perl Cookbook, 19.2. Redirecting Error Messages
    Perl Cookbook, 19.3. Fixing a 500 Server Error
  controlling for other programs : Perl Cookbook, 16.9. Controlling the Input, Output, and Error of Another Program
  creating uniform DBI numbers : Advanced Perl Programming, 10.4.1.6. What DBI does not provide
  eval function and : Advanced Perl Programming, 5.1. The String Form: Expression Evaluation
  exceptions in subroutines : Perl Cookbook, 10.12. Handling Exceptions
  handling permissions for processes : Programming Perl, 7.2.40. IPC::Open3 - Open a Process for Reading, Writing, and Error Handling
  reading STDERR from programs : Perl Cookbook, 16.7. Reading STDERR from a Program
  reporting filenames in : Perl Cookbook, 7.4. Making Perl Report Filenames in Errors
  reporting like built-ins : Perl Cookbook, 12.12. Reporting Errors and Warnings Like Built-Ins
  returning failure from subroutines : Perl Cookbook, 10.10. Returning Failure
  trapping in require/use statements : Perl Cookbook, 12.2. Trapping Errors in require or use
  trapping undefined function calls : Perl Cookbook, 10.15. Trapping Undefined Function Calls with AUTOLOAD
  web server error log
    Perl Cookbook, 19.0. Introduction
    Perl Cookbook, 20.13. Processing Server Logs
  when parsing files : Advanced Perl Programming, 6.3. Package Initialization and Destruction
errstr() (DBI) : Perl in a Nutshell, Chapter 12, Reference: errstr
escape_from() (Mail::Internet) : Perl in a Nutshell, Chapter 14, Reference: escape_from
escaped sequences
  Perl Cookbook, 1.13. Escaping Characters
  Perl in a Nutshell, 4.6.3. Escaped Sequences
  Programming Perl, 2.3.2.2. String literals
/etc/group file
  Programming Perl, 3.2.44. getgrent
  Programming Perl, 8.3.1. Time Efficiency
/etc/hosts file : Programming Perl, 3.2.49. gethostent
/etc/networks file : Programming Perl, 3.2.53. getnetent
/etc/passwd file
  Programming Perl, 3.2.61. getpwent
  Programming Perl, 8.3.1. Time Efficiency
/etc/services file : Programming Perl, 3.2.66. getservent
/etc/utmp file : Programming Perl, 3.2.50. getlogin
$EUID ($>) variable
  Perl in a Nutshell, 4.4.1. Global Special Variables
  Programming Perl, 2.9.3. Global Special Variables
  Programming Perl, 7.2.13. English - Use English or awk Names for Punctuation Variables
Ev function : Advanced Perl Programming, 14.6.2. Event Details
$EVAL_ERROR variable : Advanced Perl Programming, 5.1. The String Form: Expression Evaluation
eval function
  Advanced Perl Programming, B.7. Exception Handling
  Learning Perl, D.5.2. The eval Operator (and s///e)
  Learning Perl, 11.1. What Is a Format?
  Learning Perl on Win32 Systems, D.5.2. The eval Operator (and s///e)
  Learning Perl on Win32 Systems, 11.1. What Is a Format?
  Perl in a Nutshell, Chapter 5, Reference: eval
  Programming Perl, 3.2.32. eval
  Programming Perl, 4. References and Nested Data Structures
  Programming Perl, 8.3.1. Time Efficiency
  die function and : Programming Perl, 3.2.27. die
  exception handling with : Advanced Perl Programming, 5.2. The Block Form: Exception Handling
  expression evaluation with
    Advanced Perl Programming, 5.1. The String Form: Expression Evaluation
    Advanced Perl Programming, 5.4. Using Eval for Expression Evaluation
  improving preformance with : Advanced Perl Programming, 5.5. Using Eval for Efficiency
  loops and : Programming Perl, 8.3.1. Time Efficiency
  other languages and : Advanced Perl Programming, 5.7. Eval in Other Languages
  with require/use statement : Perl Cookbook, 12.2. Trapping Errors in require or use
  quotation marks and : Advanced Perl Programming, 5.3. Watch Your Quotes
  security and : Advanced Perl Programming, 5.1. The String Form: Expression Evaluation
  in substitution
    Perl Cookbook, 1.8. Expanding Variables in User Input
    Perl Cookbook, 6.0. Introduction
    Perl Cookbook, 6.4. Commenting Regular Expressions
  for time-outs : Advanced Perl Programming, 5.6. Using Eval for Time-Outs
  translating with variables : Programming Perl, 2.4.2. Pattern-Matching Operators
$EVAL_ERROR ($@) variable
  Perl in a Nutshell, 4.4.1. Global Special Variables
  Programming Perl, 2.9.3. Global Special Variables
  Programming Perl, 7.2.13. English - Use English or awk Names for Punctuation Variables
EventLog module : Learning Perl on Win32 Systems, B.4. Win32 Extensions
events
  event details : Advanced Perl Programming, 14.6.2. Event Details
  event loops
    Msg module : Advanced Perl Programming, 13.1.1.4. Msg: Event loop routines
    Perl/Tk and : Advanced Perl Programming, 14.2. Starting with Perl/Tk
    widgets and : Advanced Perl Programming, 14.7. Event Loops
  modifiers of : Advanced Perl Programming, 14.6. Event Bindings
  multiple bindings to : Advanced Perl Programming, 14.6.1. Multiple Bindings
  Tk resize : Perl Cookbook, 15.16. Responding to Tk Resize Events
  widget event bindings : Advanced Perl Programming, 14.6. Event Bindings
example Perl scripts
  Advanced Perl Programming, FTP
  Learning Perl on Win32 Systems, Exercises
  Perl in a Nutshell, 2.3.1.1. Perl examples
  Programming Perl, 8.5.2. Examples
exceptions : Advanced Perl Programming, B.7. Exception Handling
  die function for : Programming Perl, 3.2.27. die
  Exception.pm module : Advanced Perl Programming, 5.2.1.1. Exception.pm
  exceptions.pl module : Advanced Perl Programming, 5.2.1.2. exceptions.pl
  handling in subroutines : Perl Cookbook, 10.12. Handling Exceptions
  handling with eval : Advanced Perl Programming, 5.2. The Block Form: Exception Handling
  modules for : Advanced Perl Programming, 5.2.1. Standard Modules
  other languages and : Advanced Perl Programming, 5.7. Eval in Other Languages
  SWIG and : Advanced Perl Programming, 18.3. SWIG Features
  trapping undefined function calls : Perl Cookbook, 10.15. Trapping Undefined Function Calls with AUTOLOAD
exclamation point : (see ! (bang))
exclusive locks : Perl Cookbook, 7.11. Locking a File
exclusive OR operator
  Programming Perl, 2.5.13. Bitwise Operators
  Programming Perl, 2.5.20. Logical and, or, not, and xor
  Programming Perl, 8.2.3. Awk Traps
exec()
  Perl Cookbook, 16.0. Introduction
  Perl Cookbook, 16.3. Replacing the Current Program with a Different One
  Perl Cookbook, 19.6. Executing Commands Without Shell Escapes
  Learning Perl, 14.4. Using fork
  Perl in a Nutshell, Chapter 5, Reference: exec
  Programming Perl, 3.2.33. exec
$EXECUTABLE_NAME ($^X) variable
  Perl in a Nutshell, 4.4.1. Global Special Variables
  Programming Perl, 2.9.3. Global Special Variables
  Programming Perl, 7.2.13. English - Use English or awk Names for Punctuation Variables
execute bits
  Learning Perl, 1.4. Basic Concepts
  Learning Perl on Win32 Systems, 13.4. Modifying Permissions
execute() (DBI)
  Perl in a Nutshell, Chapter 12, Reference: execute
  Perl in a Nutshell, 12.2.3. Database Handles and Statement Handles
executing
  format : Learning Perl, 11.3. Invoking a Format
  methods : Programming Perl, 5.3.6. Method Invocation
  other programs from Perl : Programming Perl, 3.2.167. system
  Perl programs
    Programming Perl, 1.3.1. How to Do It
    Programming Perl, 6.1. Cooperating with Command Interpreters
  subroutines : Learning Perl, 8.2. Invoking a User Function
executor : Advanced Perl Programming, 20.2.3. Executor
execv function (in C) : Programming Perl, 3.2.33. exec
execvp function (in C) : Programming Perl, 3.2.33. exec
exists()
  Perl Cookbook, 5.1. Adding an Element to a Hash
  Perl in a Nutshell, Chapter 5, Reference: exists
  Programming Perl, 3.2.34. exists
  Programming Perl, 5.4.3. Tying Hashes
  multiple hash key values : Perl Cookbook, 5.7. Hashes with Multiple Values Per Key
  News::Newsrc module : Perl in a Nutshell, Chapter 15, Reference: exists
EXISTS method : Programming Perl, 5.4.3. Tying Hashes
exit()
  Learning Perl, 14.4. Using fork
  Learning Perl on Win32 Systems, 14.3. Using Processes as Filehandles
  Perl in a Nutshell, Chapter 5, Reference: exit
  Perl in a Nutshell, 11.4. Running CGI Scripts with mod_perl
  Programming Perl, 3.2.35. exit
  Programming Perl, 3.2.40. fork
exit statement (awk) : Programming Perl, 6.4.2.2. a2p
exit status, die() and
  Learning Perl, 10.3. A Slight Diversion: die
  Learning Perl on Win32 Systems, 10.4. A Slight Diversion: die
exit value
  Learning Perl, 14.4. Using fork
  Learning Perl on Win32 Systems, 14.3. Using Processes as Filehandles
exiting
  diagnostics module : Programming Perl, 7.2.10. diagnostics - Force Verbose Warning Diagnostics
  infinite loop : Programming Perl, 2.6.4.2. For loops
exp()
  Perl in a Nutshell, Chapter 5, Reference: exp
  Programming Perl, 3.2.36. exp
expand() (Net::SMTP) : Perl in a Nutshell, Chapter 14, Reference: expand
-expand option (pack geometry manager) : Perl in a Nutshell, 18.2.1. The pack Geometry Manager
ExpandEnvironmentStrings module : Learning Perl on Win32 Systems, B.4. Win32 Extensions
expanding tabs : Perl Cookbook, 1.7. Expanding and Compressing Tabs
expanding variables in user input : Perl Cookbook, 1.8. Expanding Variables in User Input
expansion, filename : Programming Perl, 3.2.69. glob
Expect module : Perl Cookbook, 15.13. Controlling Another Program with Expect
experts, and reading introductory sections : Learning Perl on Win32 Systems, 1.6.8. Making It Fair for the Rest
Expires property (response cookies)
  Perl in a Nutshell, 20.2.2.1. Setting cookies
  Perl in a Nutshell, 20.2.2.2. Response properties
ExpiresAbsolute property (Response object) : Perl in a Nutshell, 20.2.2.2. Response properties
expn program (example) : Perl Cookbook, 18.9. Program: expn and vrfy
exponential notation, in floating-point numbers : Learning Perl, 2.2.2. Float Literals
exponentiation (**) operator
  Learning Perl, 2.4.1. Operators for Numbers
  Perl in a Nutshell, 4.5.3. Arithmetic Operators
  Programming Perl, 2.5.4. Exponentiation
  Programming Perl, 8.2.3. Awk Traps
@EXPORT array (use pragma) : Perl Cookbook, 12.1. Defining a Module's Interface
export command, emulating : Learning Perl, 14.1. Using system and exec
@EXPORT_OK array (use pragma) : Perl Cookbook, 12.1. Defining a Module's Interface
@EXPORT_TAGS array (use pragma) : Perl Cookbook, 12.1. Defining a Module's Interface
Exporter module
  Advanced Perl Programming, 6.5. Importing Symbols
  Perl Cookbook, 12.0. Introduction
  Perl Cookbook, 12.1. Defining a Module's Interface
  Perl in a Nutshell, 8.48. Exporter
  Programming Perl, 7.2.15. Exporter - Default Import Method for Modules
exporting to modules : Perl Cookbook, 12.0. Introduction
-exportselection option (widgets) : Perl in a Nutshell, 18.3. Common Widget Configuration Options
expr command (debugger) : Programming Perl, 8.1.1. Debugger Commands
expressions
  array literals : Learning Perl, 3.2. Literal Representation
  evaluation
    Advanced Perl Programming, 5.1. The String Form: Expression Evaluation
    Advanced Perl Programming, 5.4. Using Eval for Expression Evaluation
    /e flag with substitutions : Advanced Perl Programming, 5.4.1. Expression Evaluation in Substitutions
  interpolating within strings : Perl Cookbook, 1.10. Interpolating Functions and Expressions Within Strings
  plotting : Advanced Perl Programming, 4.2.2.1. Expression plotting
  in subroutine body : Learning Perl, 8.3. Return Values
EXTEND macro : Advanced Perl Programming, 20.4.2.2. Ensuring that the stack is big enough
extended regular expression syntax : Perl in a Nutshell, 4.6.8. Extended Regular Expressions
$EXTENDED_OS_ERROR ($^E) variable : Perl in a Nutshell, 4.4.1. Global Special Variables
extending arrays : Programming Perl, 2.3.4. List Values and Arrays
extension modules, Perl : Advanced Perl Programming, 19.4. Adding Extensions
  definition of : Learning Perl on Win32 Systems, B.1. Library Terminology
  installing : Programming Perl, 7.2.16. ExtUtils::Install - Install Files from Here to There
  Makefiles for : Programming Perl, 7.2.18. ExtUtils::MakeMaker - Create a Makefile for a Perl Extension
  Win32, list of : Learning Perl on Win32 Systems, B.4. Win32 Extensions
extra path information : Perl in a Nutshell, 9.3. Extra Path Information
extract_cookies() (HTTP::Cookies) : Perl in a Nutshell, Chapter 17, Reference: extract_cookies
extract_links() (HTML::Parser) : Perl in a Nutshell, Chapter 17, Reference: extract_links
extracting
  from arrays : (see arrays)
  source code
    Perl in a Nutshell, 2.3.1. Installing on Unix
    Perl in a Nutshell, 2.3.2.2. Standard Perl distribution
  substrings : Programming Perl, 3.2.162. substr
  URLs from HTML : Perl Cookbook, 20.3. Extracting URLs
ExtUtils modules : Perl in a Nutshell, 8.49. ExtUtils::Command
  ExtUtils::Command module : Perl in a Nutshell, 8.49. ExtUtils::Command
  ExtUtils::Embed module
    Advanced Perl Programming, 19.4. Adding Extensions
    Perl in a Nutshell, 8.50. ExtUtils::Embed
  ExtUtils::Install module
    Perl in a Nutshell, 8.51. ExtUtils::Install
    Programming Perl, 7.2.16. ExtUtils::Install - Install Files from Here to There
  ExtUtils::Installed module : Perl in a Nutshell, 8.52. ExtUtils::Installed
  ExtUtils::Liblist module
    Perl in a Nutshell, 8.53. ExtUtils::Liblist
    Programming Perl, 7.2.17. ExtUtils::Liblist - Determine Libraries to Use and How to Use Them
  ExtUtils::MakeMaker module
    Perl in a Nutshell, 8.54. ExtUtils::MakeMaker
    Programming Perl, 7.2.18. ExtUtils::MakeMaker - Create a Makefile for a Perl Extension
  ExtUtils::Manifest module
    Perl in a Nutshell, 8.55. ExtUtils::Manifest
    Programming Perl, 7.2.19. ExtUtils::Manifest - Utilities to Write and Check a MANIFEST File
  ExtUtils::Miniperl module
    Perl in a Nutshell, 8.56. ExtUtils::Miniperl
    Programming Perl, 7.2.20. ExtUtils::Miniperl - Write the C Code for perlmain.c
  ExtUtils::Mkbootstrap module
    Perl in a Nutshell, 8.57. ExtUtils::Mkbootstrap
    Programming Perl, 7.2.21. ExtUtils::Mkbootstrap - Make a Bootstrap File for Use by DynaLoader
  ExtUtils::Mksymlists module
    Perl in a Nutshell, 8.58. ExtUtils::Mksymlists
    Programming Perl, 7.2.22. ExtUtils::Mksymlists - Write Linker Option Files for Dynamic Extension
  ExtUtils::MM_OS2 module
    Perl in a Nutshell, 8.59. ExtUtils::MM_OS2
    Programming Perl, 7.2.23. ExtUtils::MM_OS2 - Methods to Override UNIX Behavior in ExtUtils::MakeMaker
  ExtUtils::MM_Unix module
    Perl in a Nutshell, 8.60. ExtUtils::MM_Unix
    Programming Perl, 7.2.24. ExtUtils::MM_Unix - Methods Used by ExtUtils::MakeMaker
  ExtUtils::MM_VMS module
    Perl in a Nutshell, 8.61. ExtUtils::MM_VMS
    Programming Perl, 7.2.25. ExtUtils::MM_VMS - Methods to Override UNIX Behavior in ExtUtils::MakeMaker
  ExtUtils::MM_WIN32 module : Perl in a Nutshell, 8.62. ExtUtils::MM_Win32
  ExtUtils::Packlist module : Perl in a Nutshell, 8.63. ExtUtils::Packlist
  ExtUtils::testlib module : Perl in a Nutshell, 8.64. ExtUtils::testlib

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