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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
    7.7. System Variables
  NR variable: 7.7. System Variables
    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: 0.. 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
  1.4. Four Hurdles to Mastering sed and awk
  3. Understanding Regular Expression Syntax
  B.2.3. Patterns
  B.2.4. Regular Expressions
  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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