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# Index: R

R command (debugger) : 8.1.1. Debugger Commands
-r file test operator : 2.5.10. Named Unary and File Test Operators
-R file test operator : 2.5.10. Named Unary and File Test Operators
rand function : 3.2.115. rand
random numbers
  3.2.115. rand
  3.2.158. srand
range (..) operator
  2.5.15. Range Operator
  8.2.3. Awk Traps
$rdev file statistic : 3.2.159. stat
read function : 3.2.116. read
readdir function
  3.2.117. readdir
  7.2.11. DirHandle - Supply Object Methods for Directory Handles
  8.3.1. Time Efficiency
reading
  data via low-level system call : 3.2.166. sysread
  file backwards : 7.2.8.6. Examples
  input (awk) : 8.2.3. Awk Traps
  permissions for processes : 7.2.39. IPC::Open2 - Open a Process for Both Reading and Writing
  shared memory segment ID : 3.2.146. shmread
Readline module : 8.1.4. Readline Support
readlink function : 3.2.118. readlink
ReadlKey module : 8.1.4. Readline Support
ready file descriptors : 3.2.135. select (ready file descriptors)
real gid : (see $ variables, $( variable)
real uid : (see $ variables, $< variable)
real values, testing for : 3.2.25. defined
$REAL_GROUP_ID : (see $ variables, $( variable)
$REAL_USER_ID : (see $ variables, $< variable)
record delimiter : (see $ variables, $/ variable)
records
  input, separator for : (see $ variables, $/ variable)
  output, separator for : (see $ variables, $\ variable)
  variable-length : 2.8. Formats
  of various data strcutures : 4.7.5. More Elaborate Records
recursive
  open functions : 3.2.102. open
  use of subroutines : 2.7. Subroutines
recv function : 3.2.119. recv
redo operator
  2.6.4.4. Loop control
  3.2.120. redo
ref function : 3.2.121. ref
ref operator : 4.3.5. Other Tricks You Can Do with Hard References
references : 4.1. What Is a Reference?
  checking for : 3.2.121. ref
  circular, and memory : 5.3.9. A Note on Garbage Collection
  to filehandles : 4.2.6. Filehandle Referencers
  multidimensional arrays and : 4.6. A Brief Tutorial: Manipulating Lists of Lists
  to objects : 4.3.4. Using Object Methods
  objects as : 5.3.3. An Object Is Simply a Referenced Thingy
  passing : 2.7.2. Passing References
  use strict 'refs' : 7.2.59. strict - Restrict Unsafe Constructs
regexes : (see regular expressions)
regexps : (see regular expressions)
regular expressions
  (see also patterns)
  1.7. Regular Expressions
  2.4.1. Regular Expressions
  backreferences : 1.7.4. Backreferences
  character classes : 1.7. Regular Expressions
  extension syntax for : 2.4.1.4. Regular expression extensions
  matching precedence : 2.4.1.2. The rules of regular expression matching
  special variables for : 2.9.1. Regular Expression Special Variables
relational operators
  (see comparison operators)
  2.5.11. Relational Operators
removing : (see deleting)
rename function : 3.2.122. rename
repetition (x) operator
  1.5.2. String Operators
  2.5.7. Multiplicative Operators
replacing array elements : 3.2.154. splice
require function : 5.2. Modules
require operator
  2.6.7. Global Declarations
  2.9.4. Global Special Arrays
  3.2.123. require
REs : (see regular expressions)
reserved words : 2.3.1. Variables
reset function : 3.2.124. reset
restoring filehandles : 7.2.54. SelectSaver - Save and Restore Selected Filehandle
return function : 3.2.125. return
return value subroutine : 2.7. Subroutines
reusing code
  5.5.8. Thinking of Code Reuse
  8.4. Programming with Style
reverse function : 3.2.126. reverse
rewinddir function
  3.2.127. rewinddir
  7.2.11. DirHandle - Supply Object Methods for Directory Handles
right angle bracket : (see > (right angle bracket))
right justification : 2.8.1. Format Variables
right-shift (>>) operator : 2.5.9. Shift Operators
rindex function : 3.2.128. rindex
RLENGTH variable (awk) : 6.4.2.2. a2p
rmdir function : 3.2.129. rmdir
rmtree() : 7.2.31. File::Path - Create or Remove a Series of Directories
root directory, redefining : 3.2.17. chroot
routines : (see subroutines)
row : (see records)
$RS : (see $ variables, $/ variable)
RSTART variable (awk) : 6.4.2.2. a2p
running : (see executing)
runtests() : 7.2.66. Test::Harness - Run Perl Standard Test Scripts with Statistics

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