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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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