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# Index: R

r command (CPAN.pm) : Perl in a Nutshell, Chapter 2, Reference: r
R command (debugger)
  Perl in a Nutshell, Chapter 6, Reference: R
  Programming Perl, 8.1.1. Debugger Commands
r command (Perl debugger) : Perl in a Nutshell, Chapter 6, Reference: r
-r 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
-R file test operator
  Learning Perl, 10.5. 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
-r option (dprofpp) : Perl in a Nutshell, 6.5. The Perl Profiler
-r option (perlbug) : Perl in a Nutshell, 6.6. The perlbug Program
\r sequence (carriage return) : Perl in a Nutshell, 4.6.3. Escaped Sequences
race conditions : Perl Cookbook, 19.4. Writing a Safe CGI Program
rad2deg() (example) : Perl Cookbook, 2.11. Doing Trigonometry in Degrees, not Radians
radians vs. degrees : Perl Cookbook, 2.11. Doing Trigonometry in Degrees, not Radians
radio_group() (CGI.pm) : Perl in a Nutshell, Chapter 10, Reference: radio_group
radiobutton() (Menubutton) : Perl in a Nutshell, 18.14.2. Menubutton Methods
Radiobutton widget (Perl/Tk) : Perl in a Nutshell, 18.6. The Radiobutton Widget
radiobuttons
  Advanced Perl Programming, A.1.1. Radiobutton
  Advanced Perl Programming, 14.3.3. Radiobuttons and Checkbuttons
  Perl Cookbook, 15.14. Creating Menus with Tk
raise() (Canvas) : Perl in a Nutshell, 18.12.3. Canvas Methods
RaiseError attribute (DBI) : Perl in a Nutshell, 12.2.3. Database Handles and Statement Handles
rand()
  Advanced Perl Programming, 4.4.2.1. Random number generation
  Perl Cookbook, 2.7. Generating Random Numbers
  Perl Cookbook, 8.6. Picking a Random Line from a File
  Learning Perl, 3.8. Exercises
  Perl in a Nutshell, Chapter 5, Reference: rand
  Programming Perl, 3.2.115. rand
  examples of : Learning Perl, A.2. Chapter 3, Arrays and List Data
randcap program (example) : Perl Cookbook, 1.9. Controlling Case
random
  access
    to password file : Learning Perl, 16.1. Getting Password and Group Information
    with seek() : Learning Perl, 17.4. Fixed-Length Random Access Databases
  database access/insertion : Advanced Perl Programming, 10.1. Persistence Issues
  email signatures : Perl Cookbook, 16.22. Program: sigrand
  lines from files : Perl Cookbook, 8.6. Picking a Random Line from a File
  numbers
    Advanced Perl Programming, 4.4.2.1. Random number generation
    Advanced Perl Programming, 4.4.2.1. Random number generation
    Perl Cookbook, 2.0. Introduction
    Perl Cookbook, 2.7. Generating Random Numbers
    Programming Perl, 3.2.115. rand
    Programming Perl, 3.2.158. srand
    biasing : Perl Cookbook, 2.10. Generating Biased Random Numbers
  ordering of lines in files : Perl Cookbook, 8.7. Randomizing All Lines
  random-access I/O : Perl Cookbook, 8.12. Using Random-Access I/O
randomizing arrays : Perl Cookbook, 4.17. Randomizing an Array
range (..) operator
  Perl Cookbook, 6.8. Extracting a Range of Lines
  Perl in a Nutshell, 4.5.11.1. Range operator
  Programming Perl, 2.5.15. Range Operator
  Programming Perl, 8.2.3. Awk Traps
range (...) operator
  Perl Cookbook, 6.8. Extracting a Range of Lines
  Perl in a Nutshell, 4.5.11.1. Range operator
ranges of characters : Learning Perl, 7.3.1. Single-Character Patterns
raw_cookie() (CGI.pm) : Perl in a Nutshell, Chapter 10, Reference: raw_cookie
RC_ mnemonics (HTTP::Status) : Perl in a Nutshell, 17.3.4. HTTP::Status
RCPT command (SMTP) : Perl in a Nutshell, 14.1.2. The SMTP Protocol and the SMTP Session
RDBMSs (relational databases)
  Advanced Perl Programming, 7.1. OO: An Introduction
  Advanced Perl Programming, 10.4. Relational Databases
$rdev file statistic : Programming Perl, 3.2.159. stat
re module : Perl in a Nutshell, 8.124. re
read()
  Perl Cookbook, 8.0. Introduction
  Perl Cookbook, 8.15. Reading Fixed-Length Records
  Learning Perl, 17.4. Fixed-Length Random Access Databases
  Perl in a Nutshell, Chapter 5, Reference: read
  Programming Perl, 3.2.116. read
Read() (Win32::EventLog) : Perl in a Nutshell, Chapter 19, Reference: Read
read-only variables : Advanced Perl Programming, 3.3.2. Constants
ReadAttr() (Win32::Console) : Perl in a Nutshell, Chapter 19, Reference: ReadAttr
ReadChar() (Win32::Console) : Perl in a Nutshell, Chapter 19, Reference: ReadChar
readdir function
  Perl Cookbook, 9.0. Introduction
  Perl Cookbook, 9.5. Processing All Files in a Directory
  Learning Perl, 12.5. Reading a Directory Handle
  Perl in a Nutshell, Chapter 5, Reference: readdir
  Programming Perl, 3.2.117. readdir
  Programming Perl, 7.2.11. DirHandle - Supply Object Methods for Directory Handles
  Programming Perl, 8.3.1. Time Efficiency
ReadEntireFile() (Win32::Internet) : Perl in a Nutshell, Chapter 19, Reference: ReadEntireFile
reader() (Net::NNTP) : Perl in a Nutshell, Chapter 15, Reference: reader
ReadFile() (Win32::Internet) : Perl in a Nutshell, Chapter 19, Reference: ReadFile
reading
  data via low-level system call : Programming Perl, 3.2.166. sysread
  email : (see email)
  files : (see file contents; files)
  from commands : Learning Perl, 14.3. Using Processes as Filehandles
  from files
    Learning Perl, 10.4. Using Filehandles
    Learning Perl on Win32 Systems, 10.5. Using Filehandles
  input : (see input)
  news articles : Perl in a Nutshell, 15.1. The NNTP Protocol
  permissions for processes : Programming Perl, 7.2.39. IPC::Open2 - Open a Process for Both Reading and Writing
  Registry values : Learning Perl on Win32 Systems, 16.5. Opening and Reading Registry Values
  shared memory segment ID : Programming Perl, 3.2.146. shmread
  standard input : Learning Perl, 6.1. Input from STDIN
  Usenet news : Perl Cookbook, 18.4. Reading and Posting Usenet News Messages
Readline module : Programming Perl, 8.1.4. Readline Support
ReadLine option (PERLDB_OPTS) : Perl in a Nutshell, 6.4. Customizing the Debugger
readline() : Perl in a Nutshell, Chapter 5, Reference: readline
readlink()
  Learning Perl, 13.3.2. Creating Hard and Soft Links with Perl
  Perl in a Nutshell, Chapter 5, Reference: readlink
  Programming Perl, 3.2.118. readlink
  example of : Learning Perl, A.12. Chapter 13, File and Directory Manipulation
ReadlKey module : Programming Perl, 8.1.4. Readline Support
readme command (CPAN.pm) : Perl in a Nutshell, Chapter 2, Reference: readme
ReadParse() (CGI.pm) : Perl in a Nutshell, Chapter 10, Reference: ReadParse
readpipe() : Perl in a Nutshell, Chapter 5, Reference: readpipe
ReadRect() (Win32::Console) : Perl in a Nutshell, Chapter 19, Reference: ReadRect
ready file descriptors : Programming Perl, 3.2.135. select (ready file descriptors)
real gid
  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
$REAL_GROUP_ID ($() 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
real uid
  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
$REAL_USER_ID ($<) 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
real values, testing for : Programming Perl, 3.2.25. defined
Received: header line : Perl Cookbook, 3.11. Program: hopdelta
receiving sockets : Advanced Perl Programming, 12.2.1. Receiver
recipient() (Net::SMTP) : Perl in a Nutshell, Chapter 14, Reference: recipient
recno_demo program (example) : Perl Cookbook, 14.7. Treating a Text File as a Database Array
recompile command (CPAN.pm) : Perl in a Nutshell, Chapter 2, Reference: recompile
record delimiter
  (see $ variables, $/ variable)
  Perl in a Nutshell, 3.2. Command-Line Options
  input delimiter
    Learning Perl, 6.1. Input from STDIN
    Learning Perl, 14.2. Using Backquotes
    Learning Perl on Win32 Systems, 6.1. Input from STDIN
    Perl in a Nutshell, 4.4.1. Global Special Variables
    Programming Perl, 2.9.3. Global Special Variables
    Programming Perl, 6.1.2. Switches
    Programming Perl, 7.2.13. English - Use English or awk Names for Punctuation Variables
  output delimiter
    Perl in a Nutshell, 4.4.1. Global Special Variables
    Programming Perl, 2.9.3. Global Special Variables
    Programming Perl, 6.1.2. Switches
    Programming Perl, 7.2.13. English - Use English or awk Names for Punctuation Variables
record-oriented persistence : Advanced Perl Programming, 10.3. Record-Oriented Approach
records : Perl Cookbook, 11.0. Introduction
  binary tree structures : Perl Cookbook, 11.15. Program: Binary Trees
  closures as objects : Perl Cookbook, 11.7. Using Closures Instead of Objects
  comma-separated : (see CSV)
  constructing : Perl Cookbook, 11.9. Constructing Records
  counting in files : Perl Cookbook, 8.2. Counting Lines (or Paragraphs or Records) in a File
  fixed-length
    Perl Cookbook, 8.0. Introduction
    Perl Cookbook, 8.15. Reading Fixed-Length Records
  functions for : Perl in a Nutshell, 5.1. Perl Functions by Category
  lastlog file : Perl Cookbook, 8.20. Program: laston
  with pattern separators, reading : Perl Cookbook, 6.7. Reading Records with a Pattern Separator
  random-access I/O : Perl Cookbook, 8.12. Using Random-Access I/O
  reading/writing to text files : Perl Cookbook, 11.10. Reading and Writing Hash Records to Text Files
  variable-length
    Perl Cookbook, 8.9. Processing Variable-Length Text Fields
    Programming Perl, 2.8. Formats
  of various data strutures : Programming Perl, 4.7.5. More Elaborate Records
  wtmp file : Perl Cookbook, 8.18. Program: tailwtmp
recursive
  open functions : Programming Perl, 3.2.102. open
  use of subroutines : Programming Perl, 2.7. Subroutines
  processing files in directories : Perl Cookbook, 9.7. Processing All Files in a Directory Recursively
recv()
  Perl in a Nutshell, Chapter 5, Reference: recv
  Programming Perl, 3.2.119. recv
  Socket module : Perl in a Nutshell, 13.1. Built-in Socket Functions
redirect()
  Perl Cookbook, 19.8. Redirecting to a Different Location
  Perl in a Nutshell, Chapter 10, Reference: redirect
Redirect() (Response object, PerlScript) : Perl in a Nutshell, 20.2.2.3. Response methods
redirecting : Advanced Perl Programming, 3.4.1. I/O Redirection
  CGI error messages : Perl Cookbook, 19.2. Redirecting Error Messages
  CGI requests : Perl Cookbook, 19.8. Redirecting to a Different Location
redo operator
  Learning Perl, 9.3. The redo Statement
  Perl in a Nutshell, Chapter 5, Reference: redo
  Perl in a Nutshell, 4.3.1.5. Loop control
  Programming Perl, 2.6.4.4. Loop control
  Programming Perl, 3.2.120. redo
ref()
  Advanced Perl Programming, 1.4. Querying a Reference
  Advanced Perl Programming, 7.2.4. The Need for Polymorphism
  Perl Cookbook, 11.0. Introduction
  Perl Cookbook, 13.0. Introduction
  Perl in a Nutshell, Chapter 5, Reference: ref
  Perl in a Nutshell, 4.8.2. Dereferencing
  Programming Perl, 3.2.121. ref
  Programming Perl, 4.3.5. Other Tricks You Can Do with Hard References
references
  (see also scalars)
  Advanced Perl Programming, 1. Data References and Anonymous Storage
  Advanced Perl Programming, 1.1.1. A Reference Is Just Another Scalar
  Advanced Perl Programming, 1.2. Using References
  Advanced Perl Programming, 20.3.1. Scalar Values
  Perl Cookbook, 11.0. Introduction
  Perl in a Nutshell, 4.8. References and Complex Data Structures
  Perl in a Nutshell, 4.8.1. Creating References
  Programming Perl, 4.1. What Is a Reference?
  to anonymous arrays/hashes : Advanced Perl Programming, 1.2.3. References to Anonymous Storage
  to arrays : Perl Cookbook, 11.1. Taking References to Arrays
  arrays of scalar references : Perl Cookbook, 11.6. Creating Arrays of Scalar References
  as hash keys : Perl Cookbook, 13.15. Creating Magic Variables with tie
  autovivification : Perl Cookbook, 11.0. Introduction
  blessed, IVs and : Advanced Perl Programming, 20.3.1.3. SVs and object pointers
  C pointers : Advanced Perl Programming, 1. Data References and Anonymous Storage
  in CGI programs : Learning Perl, 19.7.1. References
  checking for : Programming Perl, 3.2.121. ref
  circular
    Advanced Perl Programming, 1.6.1. Reference Counts
    Programming Perl, 5.3.9. A Note on Garbage Collection
  closures as objects : Perl Cookbook, 11.7. Using Closures Instead of Objects
  to constants : Advanced Perl Programming, 3.3.2. Constants
  dereferencing : Advanced Perl Programming, 1.1.2. Dereferencing
  to filehandles : Programming Perl, 4.2.6. Filehandle Referencers
  to functions : Perl Cookbook, 11.4. Taking References to Functions
  as hash values : Perl Cookbook, 5.12. Hashing References
  to hashes : Perl Cookbook, 11.3. Taking References to Hashes
  hashes of arrays : Perl Cookbook, 11.2. Making Hashes of Arrays
  iterating over arrays by : Perl Cookbook, 4.5. Iterating Over an Array by Reference
  to methods : Perl Cookbook, 11.8. Creating References to Methods
  multidimensional arrays and : Programming Perl, 4.6. A Brief Tutorial: Manipulating Lists of Lists
  multiple levels of : Advanced Perl Programming, 1.2.4. Dereferencing Multiple Levels of Indirection
  nested data structures : Advanced Perl Programming, 1.3. Nested Data Structures
  object references
    Advanced Perl Programming, 7.2.2. Unique Identity
    Programming Perl, 4.3.4. Using Object Methods
  objects as : Programming Perl, 5.3.3. An Object Is Simply a Referenced Thingy
  in other languages : Advanced Perl Programming, 1.7.1. Tcl
  to packages, indirect : Perl Cookbook, 12.13. Referring to Packages Indirectly
  passing
    Perl in a Nutshell, 4.7.3. Passing References
    Programming Perl, 2.7.2. Passing References
  passing by : Perl Cookbook, 10.5. Passing Arrays and Hashes by Reference
  performance and : Advanced Perl Programming, 1.2.2. Performance Efficiency
  precedence and : Advanced Perl Programming, 1.1.6. Confusion About Precedence
  querying : Advanced Perl Programming, 1.4. Querying a Reference
  reference count
    Advanced Perl Programming, 1.6.1. Reference Counts
    Perl Cookbook, 11.0. Introduction
  returning by : Perl Cookbook, 10.9. Returning More Than One Array or Hash
  to scalars : Perl Cookbook, 11.5. Taking References to Scalars
  selective aliases : Advanced Perl Programming, 3.3.1. Selective Aliasing
  self-referential structures : Perl Cookbook, 13.13. Coping with Circular Data Structures
  static allocation : Advanced Perl Programming, 1.1. Referring to Existing Variables
  to subroutines
    (see also closures)
    Advanced Perl Programming, 4.1. Subroutine References
    Advanced Perl Programming, 4.3. Closures
  SWIG and : Advanced Perl Programming, 18.3. SWIG Features
  symbolic
    Advanced Perl Programming, B.6. Dynamic Behavior
    Advanced Perl Programming, 1.5. Symbolic References
    Advanced Perl Programming, 4.1.4. Symbolic References
    Advanced Perl Programming, 6.1.2. Symbolic References
    Perl Cookbook, 1.8. Expanding Variables in User Input
    Perl Cookbook, 12.13. Referring to Packages Indirectly
  syntax for : Advanced Perl Programming, B.1. References
  typeglobs and
    Advanced Perl Programming, 3.2.2.1. Efficient parameter passing
    Advanced Perl Programming, 3.3.4. References to Typeglobs
  use strict 'refs' : Programming Perl, 7.2.59. strict - Restrict Unsafe Constructs
referents : Perl Cookbook, 11.0. Introduction
referer() (CGI.pm) : Perl in a Nutshell, Chapter 10, Reference: referer
"referrer" vs. "referer" : Perl Cookbook, 20.1. Fetching a URL from a Perl Script
refile() (Mail::Folder) : Perl in a Nutshell, Chapter 14, Reference: refile
reflection
  Advanced Perl Programming, 6.8. Accessing the Symbol Table
  Advanced Perl Programming, 6.9. Language Comparisons
regedit.exe, regedt32.exe utilities : Learning Perl on Win32 Systems, 16.4. The Registry
-regex option (perlcc) : Perl in a Nutshell, 3.4. The Perl Compiler
regexes : (see regular expressions)
RegExp tool : Advanced Perl Programming, 20.1. Reading the Source
regexps : (see regular expressions)
Registry access and management
  Learning Perl on Win32 Systems, 16.4. The Registry
  Perl in a Nutshell, 19.13. Win32::Registry
Registry module
  Learning Perl on Win32 Systems, A.15. Chapter 16, System Information
  Learning Perl on Win32 Systems, B.4. Win32 Extensions
  Learning Perl on Win32 Systems, 16.4. The Registry
  Learning Perl on Win32 Systems, 16.4.1. The Registry Structure
regular expressions
  (see also pattern matching)
  (see also patterns)
  Perl Cookbook, 1.16. Soundex Matching
  Learning Perl, 1.5.7. Handling Varying Input Formats
  Learning Perl on Win32 Systems, 1.6.7. Handling Varying Input Formats
  Learning Perl on Win32 Systems, 7.1. Concepts About Regular Expressions
  Perl in a Nutshell, 4.6. Regular Expressions
  Programming Perl, 1.7. Regular Expressions
  Programming Perl, 2.4.1. Regular Expressions
  alternation in : Learning Perl, 7.3.2.4. Alternation
  anchoring in
    Learning Perl, 7.3.3. Anchoring Patterns
    Learning Perl on Win32 Systems, 7.3.3. Anchoring Patterns
  anchors : Perl in a Nutshell, 4.6.5. Anchors
  backreferences : Programming Perl, 1.7.4. Backreferences
  backtracking in : Learning Perl, 7.3.2.2. Multipliers
  character classes
    Learning Perl, 7.3.1. Single-Character Patterns
    Perl in a Nutshell, 4.6.4. Character Classes
    Programming Perl, 1.7. Regular Expressions
  checking if strings are valid numbers : Perl Cookbook, 2.1. Checking Whether a String Is a Valid Number
  commenting : Perl Cookbook, 6.4. Commenting Regular Expressions
  compared with globbing : Learning Perl, 12.2. Globbing
  definition of : Learning Perl, 7.1. Concepts About Regular Expressions
  escaped sequences : Perl in a Nutshell, 4.6.3. Escaped Sequences
  examples of
    Learning Perl, 1.5.8. Making It Fair for the Rest
    Learning Perl, 1.5.9. Making It a Bit More Modular
    Learning Perl, 9.1. The last Statement
    Learning Perl on Win32 Systems, 1.6.8. Making It Fair for the Rest
    Learning Perl on Win32 Systems, 1.6.9. Making It a Bit More Modular
    Learning Perl on Win32 Systems, 9.1. The last Statement
  extended syntax
    Learning Perl on Win32 Systems, D.8. Additional Regular Expression Features
    Perl in a Nutshell, 4.6.8. Extended Regular Expressions
    Programming Perl, 2.4.1.4. Regular expression extensions
  functions for : Perl in a Nutshell, 5.1. Perl Functions by Category
  fuzzy matching : Perl Cookbook, 6.13. Approximate Matching
  grouping patterns of : Learning Perl, 7.3.2. Grouping Patterns
  honoring locale settings : Perl Cookbook, 6.12. Honoring Locale Settings in Regular Expressions
  matching precedence : Programming Perl, 2.4.1.2. The rules of regular expression matching
  metacharacters : (see metacharacters)
  multiple-byte matching : Perl Cookbook, 6.18. Matching Multiple-Byte Characters
  non-special characters of : Learning Perl, 7.3.1. Single-Character Patterns
  pattern match variables : Perl in a Nutshell, 4.6.7. Pattern Match Variables
  pattern matching operators
    Perl in a Nutshell, 4.5.7. Pattern Match Operators
    Perl in a Nutshell, 4.6.1. Pattern-Matching Operators
  precedence in
    Learning Perl, 7.3.4. Precedence
    Learning Perl on Win32 Systems, 7.3.4. Precedence
  quantifiers : Perl in a Nutshell, 4.6.6. Quantifiers
  special (predefined) variables
    Perl in a Nutshell, 4.4.5. Regular Expression Special Variables
    Programming Perl, 2.9.1. Regular Expression Special Variables
  split() and : Learning Perl, 7.6.1. The split Function
  tcgrep program : Perl Cookbook, 6.22. Program: tcgrep
  testing for invalid patterns : Perl Cookbook, 6.11. Testing for a Valid Pattern
  urlify program : Perl Cookbook, 6.21. Program: urlify
  useful and interesting (list) : Perl Cookbook, 6.23. Regular Expression Grabbag
  variable interpolation : Learning Perl, 7.4.4. Using Variable Interpolation
rel() (URI::URL) : Perl in a Nutshell, Chapter 17, Reference: rel
relational databases (RDBMSs)
  Advanced Perl Programming, 7.1. OO: An Introduction
  Advanced Perl Programming, 10.4. Relational Databases
relational operators
  (see comparison operators)
  Perl in a Nutshell, 4.5.4.1. Relational operators
  Programming Perl, 2.5.11. Relational Operators
relative indexing : Advanced Perl Programming, 14.3.5.3. Insertion with relative indexing
release()
  Win32::Mutex module : Perl in a Nutshell, Chapter 19, Reference: release
  Win32::Semaphore module : Perl in a Nutshell, Chapter 19, Reference: release
-relheight, -relwidth options (place geometry manager) : Perl in a Nutshell, 18.2.3. The Place Geometry Manager
-relief option (widgets) : Perl in a Nutshell, 18.3. Common Widget Configuration Options
reload command (CPAN.pm) : Perl in a Nutshell, Chapter 2, Reference: reload
-relx, -rely options (place geometry manager) : Perl in a Nutshell, 18.2.3. The Place Geometry Manager
remote procedure calls (RPC)
  Advanced Perl Programming, 13.2. Remote Procedure Calls (RPC)
  Advanced Perl Programming, 17.1. On Code Generation
REMOTE_ADDR variable : Perl in a Nutshell, 9.4. CGI Environment Variables
remote_host() (CGI.pm) : Perl in a Nutshell, Chapter 10, Reference: remote_host
REMOTE_HOST variable : Perl in a Nutshell, 9.4. CGI Environment Variables
REMOTE_IDENT variable : Perl in a Nutshell, 9.4. CGI Environment Variables
remote_user() (CGI.pm) : Perl in a Nutshell, Chapter 10, Reference: remote_user
REMOTE_USER variable : Perl in a Nutshell, 9.4. CGI Environment Variables
remove_header() (HTTP::Headers) : Perl in a Nutshell, Chapter 17, Reference: remove_header
remove_sig() (Mail::Internet) : Perl in a Nutshell, Chapter 14, Reference: remove_sig
removing : (see deleting)
  characters : Learning Perl, 15.5. Transliteration
  files : Learning Perl, 13.1. Removing a File
  HTML tags : Perl Cookbook, 20.6. Extracting or Removing HTML Tags
  last character
    Learning Perl, 2.6.3. The chop and chomp Functions
    Learning Perl on Win32 Systems, 15.5. Transliteration
rename command (Windows NT) : Learning Perl on Win32 Systems, 13.2. Renaming a File
rename script (example) : Perl Cookbook, 9.9. Renaming Files
rename()
  Learning Perl, 1.5.15. Making Those Old Word Lists More Noticeable
  Learning Perl, 13.2. Renaming a File
  Learning Perl on Win32 Systems, 1.6.15. Making Those Old Word Lists More Noticeable
  Learning Perl on Win32 Systems, 13.2. Renaming a File
  Perl in a Nutshell, Chapter 5, Reference: rename
  Programming Perl, 3.2.122. rename
  examples of
    Learning Perl, A.12. Chapter 13, File and Directory Manipulation
    Learning Perl, 1.5.17. The Final Programs
  Net::FTP module : Perl in a Nutshell, Chapter 16, Reference: rename
Rename() (Win32::Internet) : Perl in a Nutshell, Chapter 19, Reference: Rename
renaming files
  Perl Cookbook, 9.9. Renaming Files
  Learning Perl, 13.2. Renaming a File
  examples of
    Learning Perl, 1.5.15. Making Those Old Word Lists More Noticeable
    Learning Perl on Win32 Systems, 1.6.15. Making Those Old Word Lists More Noticeable
rep program (example) : Perl Cookbook, 15.12. Managing the Screen
repeat function : Advanced Perl Programming, 14.5. Timers
-repeatdelay option
  Scale widget : Perl in a Nutshell, 18.13. The Scale Widget
  Scrollbar widget : Perl in a Nutshell, 18.9. The Scrollbar Widget
-repeatinterval option
  Scale widget : Perl in a Nutshell, 18.13. The Scale Widget
  Scrollbar widget : Perl in a Nutshell, 18.9. The Scrollbar Widget
repetition (x) operator
  Programming Perl, 1.5.2. String Operators
  Programming Perl, 2.5.7. Multiplicative Operators
replacing array elements : Programming Perl, 3.2.154. splice
reply() (Mail::Internet) : Perl in a Nutshell, Chapter 14, Reference: reply
report generating, example of : Learning Perl on Win32 Systems, 1.6.14. Listing the Secret Words
Report() (Win32::EventLog) : Perl in a Nutshell, Chapter 19, Reference: Report
reporting bugs in Perl : Perl in a Nutshell, 6.6. The perlbug Program
reporting errors : (see errors; warning messages)
reports, generating
  Learning Perl, 1.5.14. Listing the Secret Words
  Learning Perl, 11.1. What Is a Format?
request() (LWP::UserAgent) : Perl in a Nutshell, 17.2.3. LWP::UserAgent
Request() (Win32::Internet) : Perl in a Nutshell, Chapter 19, Reference: Request
Request object (PerlScript) : Perl in a Nutshell, 20.2. Server-Side PerlScript
request_method() (CGI.pm) : Perl in a Nutshell, Chapter 10, Reference: request_method
REQUEST_METHOD environment variable : Perl in a Nutshell, 9.4. CGI Environment Variables
requests, HTTP
  HTTP::Request module
    Perl in a Nutshell, 17.1. LWP Overview
    Perl in a Nutshell, 17.3.1. HTTP::Request
  UserAgent object for
    Perl in a Nutshell, 17.1. LWP Overview
    Perl in a Nutshell, 17.2. The LWP Modules
    Perl in a Nutshell, 17.2.3. LWP::UserAgent
require()
  Perl in a Nutshell, Chapter 5, Reference: require
  Programming Perl, 2.6.7. Global Declarations
  Programming Perl, 2.9.4. Global Special Arrays
  Programming Perl, 3.2.123. require
  Programming Perl, 5.2. Modules
require statement
  Advanced Perl Programming, 6.2. Packages and Files
  Perl Cookbook, 12.0. Introduction
  Perl in a Nutshell, 7.2. Modules
  trapping errors in : Perl Cookbook, 12.2. Trapping Errors in require or use
REs : (see regular expressions)
reserved words : Programming Perl, 2.3.1. Variables
reset()
  Perl in a Nutshell, Chapter 5, Reference: reset
  Programming Perl, 3.2.124. reset
  CGI.pm module : Perl in a Nutshell, Chapter 10, Reference: reset
  Net::POP3 module : Perl in a Nutshell, Chapter 14, Reference: reset
  Net::SMTP module : Perl in a Nutshell, Chapter 14, Reference: reset
  Win32::ChangeNotification module : Perl in a Nutshell, Chapter 19, Reference: reset
Reset()
  Mail::POP3Client module
    Perl in a Nutshell, Chapter 14, Reference: Reset
    Perl in a Nutshell, 14.2.8.4. Deleting and undeleting messages
  Win32::OLE::Enum module : Perl in a Nutshell, Chapter 19, Reference: Reset
resizable() (Frame widget) : Perl in a Nutshell, 18.18.1. Toplevel Methods
resizing : (see size)
-resolution option (Scale) : Perl in a Nutshell, 18.13. The Scale Widget
Resolve() (Win32::Shortcut) : Perl in a Nutshell, Chapter 19, Reference: Resolve
resources for further reading
  Advanced Perl Programming, Resources
  Perl in a Nutshell, 1.4. Perl Resources
  perldsc document : Advanced Perl Programming, 2. Implementing Complex Data Structures
  perltoot document : Advanced Perl Programming, 4.4.3. Closures Versus Objects
resources, managing shared : Perl in a Nutshell, 19.11. Win32::NetResource
Response object (PerlScript)
  Perl in a Nutshell, 20.2. Server-Side PerlScript
  Perl in a Nutshell, 20.2.2. The Response Object
responses, HTTP : Perl in a Nutshell, 17.3.2. HTTP::Response
restarting servers on demand : Perl Cookbook, 17.16. Restarting a Server on Demand
restoring filehandles : Programming Perl, 7.2.54. SelectSaver - Save and Restore Selected Filehandle
result : Learning Perl, 2.4. Scalar Operators
Resume() (Win32::Process) : Perl in a Nutshell, Chapter 19, Reference: Resume
ResumeService() (Win32::Service) : Perl in a Nutshell, Chapter 19, Reference: ResumeService
retr() (Net::FTP) : Perl in a Nutshell, Chapter 16, Reference: retr
Retrieve() (Mail::POP3Client)
  Perl in a Nutshell, Chapter 14, Reference: Retrieve
  Perl in a Nutshell, 14.2.8.3. Retrieving the message body
retrieve() (Storable module) : Perl Cookbook, 11.13. Storing Data Structures to Disk
retrieve_where function : Advanced Perl Programming, 11.1. Adaptor: An Introduction
  Adaptor::DBI module : Advanced Perl Programming, 11.3.2.2. Queries
  Adaptor::File module : Advanced Perl Programming, 11.3.1.3. Query processing
retrieving email messages : Perl in a Nutshell, 14.1.3. Retrieving Email with Net::POP3
retrieving URLs : Perl Cookbook, 20.1. Fetching a URL from a Perl Script
return statement
  Perl Cookbook, 10.10. Returning Failure
  Perl in a Nutshell, Chapter 5, Reference: return
  Perl in a Nutshell, 4.7.2. Passing Arguments
  Programming Perl, 3.2.125. return
return context, subroutines : Perl Cookbook, 10.6. Detecting Return Context
return stack (retstack) : Advanced Perl Programming, 20.4.3. Inside Other Stacks
return status, backwards for system() : Learning Perl, 14.1. Using system and exec
return values
  Perl Cookbook, 10.8. Skipping Selected Return Values
  Perl Cookbook, 10.9. Returning More Than One Array or Hash
  Perl Cookbook, 10.10. Returning Failure
  Learning Perl, 1.5.9. Making It a Bit More Modular
  Programming Perl, 2.7. Subroutines
  from fork : Learning Perl, 14.4. Using fork
  print() and : Learning Perl, 6.3.1. Using print for Normal Output
  read() : Learning Perl, 17.4. Fixed-Length Random Access Databases
  select() : Learning Perl, 11.6.1. Using select() to Change the Filehandle
  subroutine, example of
    Learning Perl, 1.5.17. The Final Programs
    Learning Perl, 8.3. Return Values
    Learning Perl on Win32 Systems, 1.6.17. The Final Programs
    Learning Perl on Win32 Systems, 1.6.9. Making It a Bit More Modular
    Learning Perl on Win32 Systems, 8.3. Return Values
  tr operator : Learning Perl, 15.5. Transliteration
Reuse option (IO::Socket::INET) : Perl in a Nutshell, 13.2.4. IO::Socket::INET Reference
reusing code
  Programming Perl, 5.5.8. Thinking of Code Reuse
  Programming Perl, 8.4. Programming with Style
reverse()
  Perl Cookbook, 1.6. Reversing a String by Word or Character
  Perl Cookbook, 4.10. Reversing an Array
  Learning Perl, 3.4.5. The reverse Function
  Perl in a Nutshell, Chapter 5, Reference: reverse
  Programming Perl, 3.2.126. reverse
  example of
    Learning Perl, A.2. Chapter 3, Arrays and List Data
    Learning Perl, A.5. Chapter 6, Basic I/O
    Learning Perl on Win32 Systems, A.2. Chapter 3, Arrays and List Data
    Learning Perl on Win32 Systems, A.5. Chapter 6, Basic I/O
  inverting hashes : Perl Cookbook, 5.8. Inverting a Hash
reversing
  array elements : Perl Cookbook, 4.10. Reversing an Array
  words/characters in strings : Perl Cookbook, 1.6. Reversing a String by Word or Character
revert() (HTTP::Cookies) : Perl in a Nutshell, Chapter 17, Reference: revert
revhash_demo program (example) : Perl Cookbook, 13.15. Creating Magic Variables with tie
rewinddir()
  Perl Cookbook, 9.5. Processing All Files in a Directory
  Perl in a Nutshell, Chapter 5, Reference: rewinddir
  Programming Perl, 3.2.127. rewinddir
  Programming Perl, 7.2.11. DirHandle - Supply Object Methods for Directory Handles
right angle bracket : (see < > (angle brackets))
right associativity : Learning Perl, 2.4.3. Operator Precedence and Associativity
right justification : Programming Perl, 2.8.1. Format Variables
right-shift (>>) operator : Programming Perl, 2.5.9. Shift Operators
rindex()
  Learning Perl, A.14. Chapter 15, Other Data Transformation
  Learning Perl, 15.1. Finding a Substring
  Learning Perl on Win32 Systems, 15.1. Finding a Substring
  Perl in a Nutshell, Chapter 5, Reference: rindex
  Programming Perl, 3.2.128. rindex
RLENGTH variable (awk) : Programming Perl, 6.4.2.2. a2p
rm command, unlink() and : Learning Perl, 13.1. Removing a File
rmdir function
  Perl Cookbook, 9.8. Removing a Directory and Its Contents
  Learning Perl, 13.4. Making and Removing Directories
  Learning Perl on Win32 Systems, 13.3. Making and Removing Directories
  Perl in a Nutshell, Chapter 5, Reference: rmdir
  Programming Perl, 3.2.129. rmdir
  Net::FTP module : Perl in a Nutshell, Chapter 16, Reference: rmdir
Rmdir() (Win32::Internet) : Perl in a Nutshell, Chapter 19, Reference: Rmdir
rmtree() : Programming Perl, 7.2.31. File::Path - Create or Remove a Series of Directories
rmtree program (example) : Perl Cookbook, 9.8. Removing a Directory and Its Contents
Robot User Agent : Perl in a Nutshell, 17.2.1. LWP::RobotUA sections
robots for web traversal : Perl Cookbook, 20.11. Creating a Robot
rollback() (DBI) : Perl in a Nutshell, Chapter 12, Reference: rollback
roman() (Roman module) : Perl Cookbook, 2.6. Working with Roman Numerals
Roman module : Perl Cookbook, 2.6. Working with Roman Numerals
roman numerals : Perl Cookbook, 2.6. Working with Roman Numerals
root directory (/)
  Perl Cookbook, 9.0. Introduction
  Programming Perl, 3.2.17. chroot
rounding floating-point numbers : Perl Cookbook, 2.3. Rounding Floating-Point Numbers
routines : (see subroutines)
row : (see records)
-row option (grid manager) : Perl in a Nutshell, 18.2.2. The grid Geometry Manager
rows() (DBI) : Perl in a Nutshell, Chapter 12, Reference: rows
-rowspan option (grid manager) : Perl in a Nutshell, 18.2.2. The grid Geometry Manager
RPC (Remote Procedure Call)
  Advanced Perl Programming, 13.2. Remote Procedure Calls (RPC)
  Advanced Perl Programming, 17.1. On Code Generation
$RS
  Learning Perl, 6.1. Input from STDIN
  Learning Perl, 14.2. Using Backquotes
  Learning Perl on Win32 Systems, 6.1. Input from STDIN
  Perl in a Nutshell, 4.4.1. Global Special Variables
  Programming Perl, 2.9.3. Global Special Variables
  Programming Perl, 6.1.2. Switches
  Programming Perl, 7.2.13. English - Use English or awk Names for Punctuation Variables
RSTART variable (awk) : Programming Perl, 6.4.2.2. a2p
RTTI (Run Time Type Identification) : Advanced Perl Programming, 6.9.3. C/C++
rules() (LWP::RobotUA) : Perl in a Nutshell, Chapter 17, Reference: rules
-run option (perlcc) : Perl in a Nutshell, 3.4. The Perl Compiler
run time, loading modules at : Perl Cookbook, 12.3. Delaying use Until Run Time
run-time binding : Advanced Perl Programming, 7.2.4. The Need for Polymorphism
run-time errors
  (see errors)
  (see exceptions)
run-time evaluation
  (see also eval function)
  Advanced Perl Programming, B.6. Dynamic Behavior
  Advanced Perl Programming, 5. Eval
  Advanced Perl Programming, Language Syntax
  Programming Perl, 7.2.48.8. Run-time overloading
  in other languages : Advanced Perl Programming, 5.7. Eval in Other Languages
run-time scoping : Perl Cookbook, 10.13. Saving Global Values
RUNAT attribute (<SCRIPT>) : Perl in a Nutshell, 20.2. Server-Side PerlScript
running : (see executing)
runtests() : Programming Perl, 7.2.66. Test::Harness - Run Perl Standard Test Scripts with Statistics

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