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Index: R

race conditions : 19.4. Writing a Safe CGI Program

rad2deg( ) (example) : 2.11. Doing Trigonometry in Degrees, not Radians

radians vs. degrees : 2.11. Doing Trigonometry in Degrees, not Radians

radiobuttons : 15.14. Creating Menus with Tk

rand( )

2.7. Generating Random Numbers
8.6. Picking a Random Line from a File

randcap program (example) : 1.9. Controlling Case

random

email signatures : 16.22. Program: sigrand

lines from files : 8.6. Picking a Random Line from a File

numbers

2.0. Introduction
2.7. Generating Random Numbers
biasing : 2.10. Generating Biased Random Numbers

ordering of lines in files : 8.7. Randomizing All Lines

random-access I/O : 8.12. Using Random-Access I/O

randomizing arrays : 4.17. Randomizing an Array

range (.. and ...) operators : 6.8. Extracting a Range of Lines

read( )

8.0. Introduction
8.15. Reading Fixed-Length Records

readdir( )

9.0. Introduction
9.5. Processing All Files in a Directory

reading email : (see email)

reading files : (see file access; file contents)

reading input : (see input)

reading Usenet news : 18.4. Reading and Posting Usenet News Messages

Received: header line : 3.11. Program: hopdelta

recno_demo program (example) : 14.7. Treating a Text File as a Database Array

records : 11.0. Introduction

binary tree structures : 11.15. Program: Binary Trees

closures as objects : 11.7. Using Closures Instead of Objects

comma-separated : (see CSV)

constructing : 11.9. Constructing Records

counting in files : 8.2. Counting Lines (or Paragraphs or Records) in a File

fixed-length

8.0. Introduction
8.15. Reading Fixed-Length Records

lastlog file : 8.20. Program: laston

with pattern separators, reading : 6.7. Reading Records with a Pattern Separator

random-access I/O : 8.12. Using Random-Access I/O

reading/writing to text files : 11.10. Reading and Writing Hash Records to Text Files

variable-length : 8.9. Processing Variable-Length Text Fields

wtmp file : 8.18. Program: tailwtmp

recursively processing files in directories : 9.7. Processing All Files in a Directory Recursively

redirect( ) : 19.8. Redirecting to a Different Location

redirecting

CGI error messages : 19.2. Redirecting Error Messages
CGI requests : 19.8. Redirecting to a Different Location

ref( )

11.0. Introduction
13.0. Introduction

references : 11.0. Introduction

to arrays : 11.1. Taking References to Arrays

arrays of scalar references : 11.6. Creating Arrays of Scalar References

as hash keys : 13.15. Creating Magic Variables with tie

autovivification : 11.0. Introduction

closures as objects : 11.7. Using Closures Instead of Objects

to functions : 11.4. Taking References to Functions

as hash values : 5.12. Hashing References

to hashes : 11.3. Taking References to Hashes

hashes of arrays : 11.2. Making Hashes of Arrays

iterating over arrays by : 4.5. Iterating Over an Array by Reference

to methods : 11.8. Creating References to Methods

to packages, indirect : 12.13. Referring to Packages Indirectly

passing by : 10.5. Passing Arrays and Hashes by Reference

reference count : 11.0. Introduction

returning by : 10.9. Returning More Than One Array or Hash

to scalars : 11.5. Taking References to Scalars

self-referential structures : 13.13. Coping with Circular Data Structures

symbolic

1.8. Expanding Variables in User Input
12.13. Referring to Packages Indirectly

referents : 11.0. Introduction

"referrer" vs. "referer" : 20.1. Fetching a URL from a Perl Script

regular expressions

(see also pattern matching)
1.16. Soundex Matching
checking if strings are valid numbers : 2.1. Checking Whether a String Is a Valid Number
commenting : 6.4. Commenting Regular Expressions
fuzzy matching : 6.13. Approximate Matching
honoring locale settings : 6.12. Honoring Locale Settings in Regular Expressions
multiple-byte matching : 6.18. Matching Multiple-Byte Characters
tcgrep program : 6.22. Program: tcgrep
testing for invalid patterns : 6.11. Testing for a Valid Pattern
urlify program : 6.21. Program: urlify
useful and interesting (list) : 6.23. Regular Expression Grabbag

removing HTML tags : 20.6. Extracting or Removing HTML Tags

rename script (example) : 9.9. Renaming Files

renaming files : 9.9. Renaming Files

rep program (example) : 15.12. Managing the Screen

reporting errors : (see errors; warnings)

require statement : 12.0. Introduction

trapping errors in : 12.2. Trapping Errors in require or use

resizing : (see size)

restarting servers on demand : 17.16. Restarting a Server on Demand

retrieve( ) (Storable module) : 11.13. Storing Data Structures to Disk

retrieving URLs : 20.1. Fetching a URL from a Perl Script

return context, subroutines : 10.6. Detecting Return Context

return statement : 10.10. Returning Failure

return values of subroutines

returning by reference : 10.9. Returning More Than One Array or Hash
returning failure : 10.10. Returning Failure
skipping selected : 10.8. Skipping Selected Return Values

reverse( )

1.6. Reversing a String by Word or Character
4.10. Reversing an Array
inverting hashes : 5.8. Inverting a Hash

reversing

array elements : 4.10. Reversing an Array
words/characters in strings : 1.6. Reversing a String by Word or Character

revhash_demo program (example) : 13.15. Creating Magic Variables with tie

rewinddir( ) : 9.5. Processing All Files in a Directory

rmdir( ) : 9.8. Removing a Directory and Its Contents

rmtree program (example) : 9.8. Removing a Directory and Its Contents

robots for web traversal : 20.11. Creating a Robot

Roman module : 2.6. Working with Roman Numerals

roman numerals : 2.6. Working with Roman Numerals

roman( ) (Roman module) : 2.6. Working with Roman Numerals

root directory (/) : 9.0. Introduction

rounding floating-point numbers : 2.3. Rounding Floating-Point Numbers

run time, loading modules at : 12.3. Delaying use Until Run Time

run-time scoping : 10.13. Saving Global Values

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