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Index: E

• @EXPORT array: Special Variables in Alphabetical Order
• @EXPORT_OK array: Special Variables in Alphabetical Order
• %EXPORT_TAGS hash: Special Variables in Alphabetical Order
• -e (execute) command-line switch: Switches
• -e (exists) file test: Some File Test Operators
• • Named Unary and File Test Operators
• /e pattern modifier: The s/// Operator (Substitution)
• each function: Access and Printing of a Hash of Hashes
• • Hash-Tying Methods
  • each
• editors, support for debugging: Editor Support for Debugging
• effective GID (group ID): Special Variables in Alphabetical Order
• effective UID ($EFFECTIVE_USER_ID): Special Variables in Alphabetical Order
• • (see also $< and $> variables)
• $EFFECTIVE_GROUP_ID: Special Variables in Alphabetical Order
• • Special Variables in Alphabetical Order
• $EFFECTIVE_USER_ID: Special Variables in Alphabetical Order
• efficiency (see performance)
• • profiling: The Perl Profiler
• elements in arrays: Arrays.
• else-if statements: The if and unless statements
• ellipses (...): Metasymbol Tables
• else statements: The if and unless statements
• emacs
• • editor support for debugger: Editor Support for Debugging
  • regular expressions, use of: Regular Expressions
  • -*- sequences: Command Processing
• email: The CPAN modules Directory
• • (see also mail)
• embedding Perl: Embedding Perl (Using Perl from C)
• • Module Installation Support
  • adding Perl interpreter to C program: Adding a Perl Interpreter to Your C Program
  • compiling embedded programs: Compiling Embedded Programs
  • evaluating Perl statement from C: Evaluating a Perl Statement from C
  • perl interpreter program: Internals and Externals
  • Perl stack, manipulating from C: Fiddling with the Perl Stack from C
• empty angle operator (<>): Filehandles
• empty subclass test: Class Inheritance
• encapsulation: Complexities
• • Using Object Methods
  • Brief Refresher on Object-Oriented Lingo
  • namespace-based: Tie Modules on CPAN
  • objects in closures: Using Closures for Private Objects
• encryption: crypt
• • modules for: Authentication, Security, and Encryption
  • Perl modules for: The CPAN modules Directory
• END blocks: The Life Cycle of a Perl Program
• • exit value of program, modifying: Avant-Garde Compiler, Retro Interpreter
  • order of running: Avant-Garde Compiler, Retro Interpreter
  • skipping: Avant-Garde Compiler, Retro Interpreter
• end of string, matching: Endings: The \z, \Z, and $ Assertions
• __END__ token: Other Literal Tokens
• • Generating Perl in Other Languages
  • Special Variables in Alphabetical Order
• endgrent function: getgrent
• endhostent function: gethostent
• ending (see terminating)
• ending escape sequences for character modification: String Literals
• endless loop (see infinite loops)
• endprotoent function: getprotoent
• endpwent function: getpwent
• endservent function: getservent
• English module: Format Variables
• • Perl Language Extensions and Internals
• enqueue method: Queues
• %ENV hash: Special Variables in Alphabetical Order
• • deleting from: delete
  • portability of: System Interaction
• Env module: Perl Language Extensions and Internals
• env program, starting Perl with: Command Processing
• • cleaning up: Cleaning Up Your Environment
• environment variables: Environment Variables
• • Special Variables in Alphabetical Order
  • Env module: Perl Language Extensions and Internals
  • modules, Perl use of: Environment Variables
  • PERLDB_OPTS, setting debugger options with: Unattended Execution
  • PERL_DESTRUCT_LEVEL: Garbage Collection with DESTROY Methods
  • portability of: System Interaction
  • shells vs. Perl: Shell Traps
  • taint checking: Handling Insecure Data
• eof function: The while and until statements
• • Time Efficiency
  • eof
  • tied filehandle, using on: Filehandle-Tying Methods
• eq operator: Universal Blunders
• equal method: Identifying threads
• equal to (=) operator: Equality Operators
• equality operators: Equality Operators
• erasing (see deleting)
• errno: Special Variables in Alphabetical Order
• Errno module: Perl Language Extensions and Internals
• error messages: Developing with Style
• • Diagnostic Messages
  • user efficiency, improving with: User Efficiency
• errors: fileno
• • Diagnostic Messages
  • Carp module: Carp
  • CGI::Carp module, handling of: CGI::Carp
  • $@ variable for: Special Variables in Alphabetical Order
  • $! variable for: Special Variables in Alphabetical Order
  • $? variable for: Special Variables in Alphabetical Order
  • failed symbol exports: Managing unknown symbols
  • insecure data: Handling Insecure Data
  • out-of-memory errors: Special Variables in Alphabetical Order
  • subroutines: Error Indications
  • warn function, producing error messages: warn
  • writing to httpd or other CGI errors logs: World Wide Web
• ESC character: String Literals
• ESC in octal: String Literals
• escape sequences for control characters: String Literals
• /etc/group file: Time Efficiency
• • getgrent
• /etc/hosts file: gethostent
• /etc/networks file: getnetent
• /etc/passwd file: Time Efficiency
• • getpwent
• /etc/protocols file: getprotoent
• /etc/services file: getservent
• /etc/utmp file: getlogin
• eval: Name Lookups
• • Terms and List Operators (Leftward)
  • References
  • Time Efficiency
  • eval
  • die function and: die
  • loops and: Time Efficiency
  • loop controls and: Bare Blocks
  • packages and: Packages
  • translating with variables: The tr/// Operator (Transliteration)
  • restricted (reval): Restricting namespace access
  • threads, catching exceptions with: Catching exceptions from join
• $EVAL_ERROR: Special Variables in Alphabetical Order
• eval_sv and eval_pv functions: Evaluating a Perl Statement from C
• • intercepting: Special Variables in Alphabetical Order
  • in detached child threads: The detach method
  • die function and: die
  • functions raising: Perl Functions in Alphabetical Order
  • insecure data: Handling Insecure Data
  • modules for: Warnings and Exceptions
  • raising on failure: Perl Language Extensions and Internals
  • raising to indicate subroutine errors: Error Indications
  • threads, catching: Catching exceptions from join
  • trapping: eval
• $EXCEPTIONS_BEING_CAUGHT: Special Variables in Alphabetical Order
• exclusive file locks: File Locking
• • obtaining: File Locking
• exclusive or (xor) operator: Bitwise Operators
• • Logical and, or, not, and xor
• exec function: exec
• • filehandles, leaving open across calls: Passing Filehandles
  • list argument form, avoiding shell with: Code Masquerading as Data
  • portability of: Interprocess Communication (IPC)
• executable image file: The Life Cycle of a Perl Program
• $EXECUTABLE_NAME: Special Variables in Alphabetical Order
• executing
• • code: Executing Your Code
  • code, conditionally: Logical Operators
  • methods: Method Invocation
  • other programs from Perl: system
  • Perl program: How to Do It
  • Perl programs: Command Processing
• execution
• • code, order of: Avant-Garde Compiler, Retro Interpreter
  • Perl programs: The Life Cycle of a Perl Program
  • unattended, debugger: Unattended Execution
• execv function (in C): exec
• execvp function (in C): exec
• existence of a process: Signaling Process Groups
• exists function: exists
• • invoking on hash: Hash-Tying Methods
• exit function: exit
• • fork
  • threads and: Thread destruction
• exit status: Special Variables in Alphabetical Order
• exiting
• • debugger: Debugger Options
  • if or unless blocks: Bare Blocks
  • infinite loop: for Loops
  • once-through blocks: Bare Blocks
  • programs: Getting Started
  • Perl debugger: Miscellaneous Commands
• exp function: exp
• expansion, filename: glob
• Expect module: Bidirectional Communication
• • The CPAN modules Directory
• explicit method invocations: Method Invocation
• exponential notation: Numeric Literals
• exponentiation (**) operator: Exponentiation
• exponentiation of integers: Fiddling with the Perl Stack from C
• Exporter module: Module Installation Support
• • Creating Extensions
  • module privacy and: Module Privacy and the Exporter
• export_fail method: Managing unknown symbols
• exporting: Modules
• exporting symbols: Creating Modules
• • Module Privacy and the Exporter
  • without using import method from Exporter: Exporting without using Exporter's import method
• export_to_level method: Exporting without using Exporter's import method
• • EXPR and LIST: Compound Statements
  • loops, separating with commas (,): for Loops
  • multiple, in loops: for Loops
  • Perl, supplying in replacement strings: Programmatic Patterns
• EXPRs: Compound Statements
• • goto operator, use with: goto
• $EXTENDED_OS_ERROR: Special Variables in Alphabetical Order
• extending arrays: Array Length
• extending Perl: Extending Perl (Using C from Perl)
• • extensions, creating: Creating Extensions
  • • Perl Language Extensions and Internals
  • using functions from external C libraby: Using Functions from an External C Library
  • XSUB input and output: XSUB Input and Output
  • XSUBs and XS language, wrapping Perl in: XS and XSUBs
• external subroutines, portability of: External Subroutines (XS)
• extracting substrings: substr
• ExtUtils::Command module: Module Installation Support
• ExtUtils::Embed module: Compiling Embedded Programs
• • Module Installation Support
• ExtUtils::Install module: Module Installation Support
• ExtUtils::Installed module: Module Installation Support
• ExtUtils::Liblist module: Module Installation Support
• ExtUtils::MakeMaker: Creating CPAN Modules
• • Creating CPAN Modules
  • (see also MakeMaker)
• ExtUtils::MakeMaker module: Module Installation Support
• ExtUtils::Manifest module: Module Installation Support
• ExtUtils::Mkbootstrap module: Module Installation Support
• ExtUtils::Mksymlists module: Module Installation Support
• ExtUtils::MM_Cygwin module: Module Installation Support
• ExtUtils::MM_OS2 module: Module Installation Support
• ExtUtils::MM_Unix module: Module Installation Support
• ExtUtils::MM_VMS module: Module Installation Support
• ExtUtils::MM_Win32 module: Module Installation Support
• ExtUtils::Packlist module: Module Installation Support
• ExtUtils::testlib module: Module Installation Support

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