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Index: R

-r (readable by effective uid/gid) file test: 1.5.7. Some File Test Operators

3.10. Named Unary and File Test Operators

-R (readable by real uid/gid file test: 3.10. Named Unary and File Test Operators

race conditions

file locking and: 16.2.1. File Locking

handling: 23.2.2. Handling Race Conditions

rand function: 3.1. Terms and List Operators (Leftward)

29.2.119. rand

random numbers: 29.2.119. rand

29.2.164. srand

producing as handles or scalars: 14.4.2. Creative Filehandles

range (.. and ...) operator: 3.15. Range Operator

ranges

character sets, specifying in: 5.2.4. The tr/// Operator (Transliteration)

characters: 5.4.1. Custom Character Classes

$rdev file statistic: 29.2.165. stat

re-initialization expressions, loops: 4.4.2. for Loops

re module: 32.1.13. Perl Language Extensions and Internals

read function: 14.4.1. Filehandle-Tying Methods

29.2.120. read

readable file test operator: 1.5.7. Some File Test Operators

3.10. Named Unary and File Test Operators

readdir function: 29.2.121. readdir

reading

data via low-level system call: 29.2.172. sysread

shared memory segment ID: 29.2.152. shmread

reading files

open mode and: 29.2.104. open

readline function: 2.11.2. Line Input (Angle) Operator

READLINE method: 14.4.1. Filehandle-Tying Methods

ReadLine module, disabling support to debugger: 20.4. Unattended Execution

readline packages: 32.1.11. User Interfaces

readlink function: 29.2.123. readlink

ready file descriptors: 29.2.141. select (ready file descriptors)

real GID (see $( variable)

real UID (see $< variable)

real values, testing for with defined function: 29.2.23. defined

$REAL_GROUP_ID: 28.2. Special Variables in Alphabetical Order

$REAL_USER_ID: 28.2. Special Variables in Alphabetical Order

reaping zombie processes: 16.1.2. Reaping Zombies

servers: 16.5.2. Networking Servers

recallCommand option (debugger): 20.3.3. Debugger Options

recompiling patterns, limiting with /o modifier: 5.2.1. Pattern Modifiers

record delimiter (see $/ variable)

record mode: 28.2. Special Variables in Alphabetical Order

records

functions dealing with: 29.1. Perl Functions by Category

input, separator for (see $/ variable)

output, separator for (see $\ variable)

of various data structures: 9.6. More Elaborate Records

composing, accessing, and printing: 9.6.1. Composition, Access, and Printing of More Elaborate Records

generating hash of: 9.6.3. Generation of a Hash of Complex Records

records, variable-length: 7. Formats

recursion of subroutines: 6.2.3. Scoping Issues

recursive lexical pad stacks: 18.3. Executing Your Code

recursive matching: 5.10.3.4. Match-time pattern interpolation

recursivity, locks: 17.2.2.1. Synchronizing access with lock

recv function: 29.2.125. recv

redo operator: 4.4.4. Loop Control

4.4.4. Loop Control

29.2.126. redo

redundancy in Perl: 1.5.6. Some Numeric and String Comparison Operators

ref function: 12.4. Object Construction

29.2.127. ref

ref operator: 8.3.6. Other Tricks You Can Do with Hard References

references: 1.2.1.1. Singularities

8. References

to anonymous data: 8.2.2. Anonymous Data

blessing: 12.4. Object Construction

braces, brackets and quoting in: 8.5. Braces, Brackets, and Quoting

casting to other pointer types: 2.6. Scalar Values

checking for: 29.2.127. ref

circular, in overloading: 13.3. Overloadable Operators

circular, and memory: 8.5.2. Garbage Collection, Circular References, and Weak References

creating: 8.2. Creating References

with backslash operator: 8.2.1. The Backslash Operator

to data structures: 8.1. What Is a Reference?

defining: 8.1. What Is a Reference?

destruction of, controlling: 19.2. Environment Variables

to filehandles: 8.2.4. Handle References

29.2.104. open

to functions, storing in data structures: 9.5. Hashes of Functions

hard: 3.2. The Arrow Operator

(see also hard references)

hash keys, providing as: 32.1.14. Convenient Classes

indirection: 8. References

locking: 17.2.2.1. Synchronizing access with lock

in multidimsional arrays: 9.1.1. Creating and Accessing a Two-Dimensional Array

object-oriented programming and: 10. Packages

for objects: 12.2. Perl's Object System

objects as: 12.4. Object Construction

passing: 6.3. Passing References

passing by: 6.2. Semantics

Perl, C pointers vs.: 3.21. C Operators Missing from Perl

references and: 2.5.1. Name Lookups

to signal handlers (user-defined): 16.1. Signals

stringifying: 8.3.6. Other Tricks You Can Do with Hard References

8.5.1. References Don't Work as Hash Keys

9.1.3. Access and Printing

9.1.5. Common Mistakes

to subroutines: 6.1. Syntax

retrieving from or passing to: 10.1. Symbol Tables

to symbol table entries: 10.1. Symbol Tables

in symbol tables to other symbol tables: 10.1. Symbol Tables

symbolic: 8.4. Symbolic References

to tied arrays: 14.2.1. Array-Tying Methods

to tied scalar variables: 14.1.1. Scalar-Tying Methods

to tied variable objects, breaking: 14.5. A Subtle Untying Trap

to hashes: 9.1.5. Common Mistakes

multidimensional hashes: 9.6. More Elaborate Records

truth value of: 1.6.1. What Is Truth?

weak: 8.5.2. Garbage Collection, Circular References, and Weak References

weakening or breaking: 12.6.1. Garbage Collection with DESTROY Methods

referents: 8.1. What Is a Reference?

objects as: 12.2. Perl's Object System

reftype function: 12.4. Object Construction

regex (see patterns)

regexes (see patterns)

regexps (see patterns)

registry (Microsoft Windows), manipulating: 14.6. Tie Modules on CPAN

32.1.20. Microsoft-Related Modules

regular expressions (see patterns)

character classes, confusing with array subscripts: 2.6.5. Interpolating Array Values

characters, matching instead of bytes: 15.2. Effects of Character Semantics

functions dealing with: 29.1. Perl Functions by Category

regular files, testing for: 1.5.7. Some File Test Operators

relational databases, hashes, tying to: 14.6. Tie Modules on CPAN

relational operators: 1.5.6. Some Numeric and String Comparison Operators

3.11. Relational Operators

nonassociation of: 3.11. Relational Operators

removing (see deleting)

rename function: 29.2.128. rename

repetition (x) operator: 1.5.2. String Operators

1.5.2. String Operators

3.7. Multiplicative Operators

replacement, matched substrings (see s/// (substitution) operator)

replacement strings, /e modifier, building with: 5.10.3.2. Substitution evaluations

replacing array elements: 29.2.160. splice

reports, generating: 7. Formats

require: 4.7. Global Declarations

require declarations, tie function and: 14. Tied Variables

require function: 11.1. Using Modules

require operator: 4.7. Global Declarations

28.2. Special Variables in Alphabetical Order

29.2.129. require

REs (see patterns)

reserved words: 2.5. Names

barewords, possible conflict with: 2.6.4. Or Leave the Quotes Out Entirely

reset function: 29.2.130. reset

return function: 29.2.131. return

return operators: 4.4.4. Loop Control

return stack: 18.3. Executing Your Code

return value, currently executing subroutine, displaying in debugger: 20.2.1. Stepping and Running

return value, subroutine: 6.2. Semantics

reused addresses, displaying contents of: 20.3.3. Debugger Options

reusing code: 24.3. Programming with Style

reval method, running suspicious code with: 23.3.1.1. Restricting namespace access

reverse, disallowing as sort subroutine name: 24.1.5. Previous Perl Traps

reverse function: 1.8. List Processing

29.2.132. reverse

reversing print and printf statements (tied filehandles): 14.4. Tying Filehandles

revision (see version)

rewinddir function: 29.2.133. rewinddir

right justification: 7.1. Format Variables

right-shift (>>) operator: 3.9. Shift Operators

rindex function: 29.2.134. rindex

rmdir function: 29.2.135. rmdir

root directory, redefining: 29.2.15. chroot

rot13 encryption: 5.2.4. The tr/// Operator (Transliteration)

routines (see subroutines)

RS (awk variable) (see $INPUT_RECORD_SEPARATOR)

RSTART (awk variable): 28.2. Special Variables in Alphabetical Order

RTF, Perl modules for: 22.1. The CPAN modules Directory

run phase: 18.1. The Life Cycle of a Perl Program

run phase vs. run time: 18.2. Compiling Your Code

running (see executing)

RV (internal reference value): 21.2. Internal Data Types

rvalue: 2.3. Built-in Data Types

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