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Index: R

• -r (readable by effective uid/gid) file test: Some File Test Operators
• • Named Unary and File Test Operators
• -R (readable by real uid/gid file test: Named Unary and File Test Operators
• race conditions
• • file locking and: File Locking
  • handling: Handling Race Conditions
• rand function: Terms and List Operators (Leftward)
• • rand
• random numbers: rand
• • srand
  • producing as handles or scalars: Creative Filehandles
• range (.. and ...) operator: Range Operator
• ranges
• • character sets, specifying in: The tr/// Operator (Transliteration)
  • characters: Custom Character Classes
• $rdev file statistic: stat
• re-initialization expressions, loops: for Loops
• re module: Perl Language Extensions and Internals
• read function: Filehandle-Tying Methods
• • read
• readable file test operator: Some File Test Operators
• • Named Unary and File Test Operators
• readdir function: readdir
• reading
• • data via low-level system call: sysread
  • shared memory segment ID: shmread
• reading files
• • open mode and: open
• readline function: Line Input (Angle) Operator
• READLINE method: Filehandle-Tying Methods
• ReadLine module, disabling support to debugger: Unattended Execution
• readline packages: User Interfaces
• readlink function: readlink
• ready file descriptors: select (ready file descriptors)
• real GID (see $( variable)
• real UID (see $< variable)
• real values, testing for with defined function: defined
• $REAL_GROUP_ID: Special Variables in Alphabetical Order
• $REAL_USER_ID: Special Variables in Alphabetical Order
• reaping zombie processes: Reaping Zombies
• • servers: Networking Servers
• recallCommand option (debugger): Debugger Options
• recompiling patterns, limiting with /o modifier: Pattern Modifiers
• record delimiter (see $/ variable)
• record mode: Special Variables in Alphabetical Order
• records
• • functions dealing with: Perl Functions by Category
  • input, separator for (see $/ variable)
  • output, separator for (see $\ variable)
  • of various data structures: More Elaborate Records
  • • composing, accessing, and printing: Composition, Access, and Printing of More Elaborate Records
    • generating hash of: Generation of a Hash of Complex Records
• records, variable-length: Formats
• recursion of subroutines: Scoping Issues
• recursive lexical pad stacks: Executing Your Code
• recursive matching: Match-time pattern interpolation
• recursivity, locks: Synchronizing access with lock
• recv function: recv
• redo operator: Loop Control
• • Loop Control
  • redo
• redundancy in Perl: Some Numeric and String Comparison Operators
• ref function: Object Construction
• • ref
• ref operator: Other Tricks You Can Do with Hard References
• references: Singularities
• • References
  • to anonymous data: Anonymous Data
  • blessing: Object Construction
  • braces, brackets and quoting in: Braces, Brackets, and Quoting
  • casting to other pointer types: Scalar Values
  • checking for: ref
  • circular, in overloading: Overloadable Operators
  • circular, and memory: Garbage Collection, Circular References, and Weak References
  • creating: Creating References
  • • with backslash operator: The Backslash Operator
  • to data structures: What Is a Reference?
  • defining: What Is a Reference?
  • destruction of, controlling: Environment Variables
  • to filehandles: Handle References
  • • open
  • to functions, storing in data structures: Hashes of Functions
  • hard: The Arrow Operator
  • • (see also hard references)
  • hash keys, providing as: Convenient Classes
  • indirection: References
  • locking: Synchronizing access with lock
  • in multidimsional arrays: Creating and Accessing a Two-Dimensional Array
  • object-oriented developing and: Packages
  • for objects: Perl's Object System
  • objects as: Object Construction
  • passing: Passing References
  • passing by: Semantics
  • Perl, C pointers vs.: Operators Missing from Perl
  • references and: Name Lookups
  • to signal handlers (user-defined): Signals
  • stringifying: Other Tricks You Can Do with Hard References
  • • References Don't Work as Hash Keys
    • Access and Printing
    • Common Mistakes
  • to subroutines: Syntax
  • • retrieving from or passing to: Symbol Tables
  • to symbol table entries: Symbol Tables
  • in symbol tables to other symbol tables: Symbol Tables
  • symbolic: Symbolic References
  • to tied arrays: Array-Tying Methods
  • to tied scalar variables: Scalar-Tying Methods
  • to tied variable objects, breaking: Subtle Untying Trap
  • to hashes: Common Mistakes
  • • multidimensional hashes: More Elaborate Records
  • truth value of: What Is Truth?
  • weak: Garbage Collection, Circular References, and Weak References
  • weakening or breaking: Garbage Collection with DESTROY Methods
• referents: What Is a Reference?
• • objects as: Perl's Object System
• reftype function: Object Construction
• regex (see patterns)
• regexes (see patterns)
• regexps (see patterns)
• registry (Microsoft Windows), manipulating: Tie Modules on CPAN
• • Microsoft-Related Modules
• regular expressions (see patterns)
• • character classes, confusing with array subscripts: Interpolating Array Values
  • characters, matching instead of bytes: Effects of Character Semantics
  • functions dealing with: Perl Functions by Category
• regular files, testing for: Some File Test Operators
• relational databases, hashes, tying to: Tie Modules on CPAN
• relational operators: Some Numeric and String Comparison Operators
• • Relational Operators
  • nonassociation of: Relational Operators
• removing (see deleting)
• rename function: rename
• repetition (x) operator: String Operators
• • String Operators
  • Multiplicative Operators
• replacement, matched substrings (see s/// (substitution) operator)
• replacement strings, /e modifier, building with: Substitution evaluations
• replacing array elements: splice
• reports, generating: Formats
• require: Global Declarations
• require declarations, tie function and: Tied Variables
• require function: Using Modules
• require operator: Global Declarations
• • Special Variables in Alphabetical Order
  • require
• REs (see patterns)
• reserved words: Names
• • barewords, possible conflict with: Or Leave the Quotes Out Entirely
• reset function: reset
• return function: return
• return operators: Loop Control
• return stack: Executing Your Code
• return value, currently executing subroutine, displaying in debugger: Stepping and Running
• return value, subroutine: Semantics
• reused addresses, displaying contents of: Debugger Options
• reusing code: Developing with Style
• reval method, running suspicious code with: Restricting namespace access
• reverse, disallowing as sort subroutine name: Previous Perl Traps
• reverse function: List Processing
• • reverse
• reversing print and printf statements (tied filehandles): Tying Filehandles
• revision (see version)
• rewinddir function: rewinddir
• right justification: Format Variables
• right-shift (>>) operator: Shift Operators
• rindex function: rindex
• rmdir function: rmdir
• root directory, redefining: chroot
• rot13 encryption: The tr/// Operator (Transliteration)
• routines (see subroutines)
• RS (awk variable) (see $INPUT_RECORD_SEPARATOR)
• RSTART (awk variable): Special Variables in Alphabetical Order
• RTF, Perl modules for: The CPAN modules Directory
• run phase: The Life Cycle of a Perl Program
• run phase vs. run time: Compiling Your Code
• running (see executing)
• RV (internal reference value): Internal Data Types
• rvalue: Built-in Data Types

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