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# Index: R

r command (sed) : 5.11. Reading and Writing Files
rand() : 9.1.3. Random Number Generation
random numbers : 9.1.3. Random Number Generation
range of characters : (see character classes)
--re-interval option (gawk) : 11.2.3.1. Command line options
read command : (see r command (sed))
reading : 10.1. The getline Function
  from files
    5.11. Reading and Writing Files
    10.1.1. Reading Input from Files
  from pipe : 10.1.3. Reading Input from a Pipe
readsource script (example) : 13.6. readsource - Format Program Source Files for troff
RECLEN variable (tawk) : 11.3.2.1. Tawk language extensions
records, awk
  2.4.1. Running awk
  7.5. Records and Fields
  B.2.1. Records and Fields
  arrays and : 8.4. Arrays
  fixed-length (tawk) : 11.3.2.1. Tawk language extensions
  multiline : 7.7.1. Working with Multiline Records
  NF variable : 7.7. System Variables
  NR variable
    7.7. System Variables
    8.4. Arrays
    10.1.2. Assigning the Input to a Variable
  RT variable (gawk) : 11.2.3.5. Regular expression record terminators
  separators for : (see delimiters)
redirection
  2.3.2.1. Saving output
  4.3. Testing and Saving Output
  10.5. Directing Output to Files and Pipes
references : Other Sources of Information About sed and awk
referencing fields
  2.4.1. Running awk
  7.5.1. Referencing and Separating Fields
regular expressions
  1.4. Four Hurdles to Mastering sed and awk
  3. Understanding Regular Expression Syntax
  B.2.3. Patterns
  B.2.4. Regular Expressions
  (see also pattern matching)
  as constants : 7.8. Relational and Boolean Operators
  delimiters for
    2.1. Awk, by Sed and Grep, out of Ed
    5.3. Substitution
  dynamic, faking : 11.1.5. Faking Dynamic Regular Expressions
  ed and : 2.1. Awk, by Sed and Grep, out of Ed
  examples of : 3.3. I Never Metacharacter I Didn't Like
  gawk extensions to : 11.2.3.4. Extended regular expressions
  metacharacters for : (see netacharacters)
  POSIX standard for : 3.2.4.3. POSIX character class additions
  RS variable as
    11.2.1.6. Regular expression record separators (gawk and mawk)
    11.3.2.1. Tawk language extensions
  tawk and : 11.3.2.1. Tawk language extensions
  union of
    3.2. A Line-Up of Characters
    3.2.9. Alternative Operations
  writing : 3.2.3. Writing Regular Expressions
relational expressions : B.2.3. Patterns
relational operators : 7.8. Relational and Boolean Operators
replacement metacharacters : 5.3.1. Replacement Metacharacters
  numbered saves : 5.3.1. Replacement Metacharacters
replacing text
  1.2. A Stream Editor
  3.2.12.1. The extent of the match
retrieving data from files : 7.11. Information Retrieval
return statement
  9.3. Writing Your Own Functions
  9.3.1. Writing a Sort Function
revision control systems : 10.7.1. Make a Copy
RS variable : 7.7. System Variables
  regular expression for
    11.2.1.6. Regular expression record separators (gawk and mawk)
    11.3.2.1. Tawk language extensions
RT variable (gawk) : 11.2.3.5. Regular expression record terminators
rules, pattern-matching : (see pattern matching)

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