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# Index: B

b command (sed) : 6.4.1. Branching
\B escape sequence : 11.2.3.4. Extended regular expressions
backreferences : (see numbered replacement strings)
backslash (\)
  7.6. Expressions
  (see also escape sequences, awk)
  \<, \> escape sequences
    3.2.11. What's the Word? Part II
    11.2.3.4. Extended regular expressions
  \`, \' escape sequences : 11.2.3.4. Extended regular expressions
  character classes and : 3.2.4. Character Classes
  as metacharacter
    3.2. A Line-Up of Characters
    3.2.1. The Ubiquitous Backslash
  in replacement text
    5.3. Substitution
    5.3.1. Replacement Metacharacters
bang (!) : (see exclamation point)
basic regular expressions (BREs) : 3.2.4.3. POSIX character class additions
BEGIN pattern : 7.2. Hello, World
  command-line parameters and : 7.10. Passing Parameters Into a Script
BEGIN procedure : 11.1.6. Control Flow
BEGINFILE procedure (tawk) : 11.3.2.1. Tawk language extensions
beginning
  of line : (see ^ (circumflex))
  of word : (see \<, \> escape sequences)
Bell Labs awk : 11.2.2. Bell Labs awk
BITFTP : BITFTP
blocks of text : 6.3.3. Building Blocks of Text
Boolean operators, awk : 7.8. Relational and Boolean Operators
  variables as Boolean patterns : 11.1.4. Variables as Boolean Patterns
braces {} : A.2.1. Pattern Addressing
  \{\} metacharacters
    3.2. A Line-Up of Characters
    3.2.8. A Span of Characters
  in awk
    2.1. Awk, by Sed and Grep, out of Ed
    2.4.1. Running awk
    8.1. Conditional Statements
  grouping sed commands in
    4.2.1. Grouping Commands
    5.1. About the Syntax of sed Commands
bracket expressions : 3.2.4. Character Classes
brackets []
  [::] metacharacters : 3.2.4.3. POSIX character class additions
  [..] metacharacters : 3.2.4.3. POSIX character class additions
  [==] metacharacters : 3.2.4.3. POSIX character class additions
  as metacharacters
    3.2. A Line-Up of Characters
    3.2.4. Character Classes
branch command : (see b command (sed))
branching : 6.4.1. Branching
break statement : 8.3. Other Statements That Affect Flow Control
breaking lines : 11.2.3.3. Line continuation
BREs (basic regular expressions) : 3.2.4.3. POSIX character class additions
buffers, flushing : 11.2.1.3. Flushing buffered output
built-in functions
  awk : 11.1.10. Functions
  gawk : 11.2.3.9. Additional functions
  tawk : 11.3.2.2. Additional built-in tawk functions
built-in variables
  7.7. System Variables
  11.1.11. Built-In Variables

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