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# Index: Symbols and Numbers

!
  built-in variable : 8.4.2. Process ID Variables and Temporary Files
  keyword in next release : A.7. The Future of the Korn Shell
  negating a condition test : 5.1.3.3. File Attribute Checking
  negation in character sets : 1.6.2. Filenames and Wildcards
  POSIX shell keyword : A.2. The IEEE 1003.2 POSIX Shell Standard
  regular expression operator
    4.3.2.1. Regular expression basics
    4.3.2.2. Korn shell versus awk/egrep regular expressions
#
  ## pattern-matching operator
    4.3.3. Pattern-matching Operators
    6.2.2. Arithmetic Variables and Assignment
  built-in variable : 4.2.1. Positional Parameters
  comments : 4.3.1. Syntax of String Operators
  length operator : 4.3.4. Length Operator
  pattern-matching operator
    4.3.3. Pattern-matching Operators
    4.5. Advanced Examples: pushd and popd
    5.5. while and until
  size of an array : 6.3. Arrays
$
  $' ANSI C string delimiter in next release : A.7. The Future of the Korn Shell
  $(( )) : (see arithmetic expressions)
  built-in variable
    2.2. The History File
    8.4.2. Process ID Variables and Temporary Files
%
  %% pattern-matching operator
    4.3.3. Pattern-matching Operators
    4.5. Advanced Examples: pushd and popd
    5.5. while and until
    6.2.2. Arithmetic Variables and Assignment
  pattern-matching operator
    4.3.3. Pattern-matching Operators
    5.2. for
    5.3. case
  specifying jobs
    8.2.1. Foreground and Background
    8.3.2. kill
    A.1. The Bourne Shell
& : (see background jobs)
&&
  for condition tests
    5.1.3.3. File Attribute Checking
    A.1. The Bourne Shell
  for exit statuses
    5.1.2. Combinations of Exit Statuses
    5.5. while and until
    A.2. The IEEE 1003.2 POSIX Shell Standard
  for condition tests : 7.2.2.3. Code blocks
> : 1.7.2. I/O Redirection
< : 1.7.2. I/O Redirection
" (weak quotes) : 1.9.1. Quoting
(( )) : (see condition tests, arithmetic)
*
  accessing entire array : 6.3. Arrays
  as default in case statement : 5.3. case
  built-in variable : 4.2.1. Positional Parameters
    as default list in for statement : 5.2. for
    as default list in select statement : 5.4. select
  regular expression operator
    4.3.2.1. Regular expression basics
    4.3.2.2. Korn shell versus awk/egrep regular expressions
  wildcard
    1.6.2. Filenames and Wildcards
    9.2.3.3. Breakpoints
+
  regular expression operator
    4.3.2.1. Regular expression basics
    4.3.2.2. Korn shell versus awk/egrep regular expressions
.
  current directory : 1.6.1.3. Changing working directories
  to hide files : 1.6.2. Filenames and Wildcards
  to run a script : 4.1. Shell Scripts and Functions
.. (directory) : 1.6.1.3. Changing working directories
:
  :+
    4.3.1. Syntax of String Operators
    5.2. for
  :-
    4.3.1. Syntax of String Operators
    4.5. Advanced Examples: pushd and popd
    9.2.3.4. Break conditions
  := : 4.3.1. Syntax of String Operators
  :?
    4.3.1. Syntax of String Operators
    4.5. Advanced Examples: pushd and popd
  no-op command : 8.4. trap
;
  ;; in case statement : 5.4. select
  statement separator
    3.2. Aliases
    5.1.3.1. String comparisons
    9.2.5. Exercises
    A.6. Workalikes on PC Platforms
?
  built-in variable
    5.1.1. Exit Status and Return
    9.1.2.2. ERR
    9.2.5. Exercises
  regular expression operator
    4.3.2.1. Regular expression basics
    4.3.2.2. Korn shell versus awk/egrep regular expressions
  wildcard
    1.6.2. Filenames and Wildcards
    4.3.2.2. Korn shell versus awk/egrep regular expressions
@
  built-in variable : 4.2.1. Positional Parameters
  preserving whitespace : 6.3. Arrays
  regular expression operator
    4.3.2.1. Regular expression basics
    4.3.2.2. Korn shell versus awk/egrep regular expressions
    9.2.3.3. Breakpoints
[ ] : (see condition tests, old syntax)
[ ] (wildcard)
  1.6.2. Filenames and Wildcards
  4.3.2.2. Korn shell versus awk/egrep regular expressions
[[ ]] : (see condition tests)
\ (backslash) : 1.9.2. Backslash-escaping
  as continuation characters : 1.9.4. Continuing Lines
  for quoting quote marks : 1.9.3. Quoting Quotation Marks
\" (weak quotes) : 3.4.1. Variables and Quoting
^
  matching beginning of line in regular expressions
    2.3.4. Moving Around in the History File
    10.1. Installing the Korn Shell as the Standard Shell
  as pipe character in Bourne shell
    10.1. Installing the Korn Shell as the Standard Shell
    A.1. The Bourne Shell
` (grave accent) : A.7. The Future of the Korn Shell
  archaic command substitution delimiter
    4.4. Command Substitution
    A.1. The Bourne Shell
    obsolescence in next release : A.7. The Future of the Korn Shell
|
  |&, background job with two-way pipes
    8.5.4. Coroutines with Two-way Pipes
    8.5.5. Two-way Pipes Versus Standard Pipes
  || for condition tests
    5.1.3.3. File Attribute Checking
    A.1. The Bourne Shell
  || for exit statuses
    5.1.2. Combinations of Exit Statuses
    9.2.3.3. Breakpoints
    A.2. The IEEE 1003.2 POSIX Shell Standard
  as case pattern separator : 5.3. case
  pipe
    1.7.3. Pipelines
    10.1. Installing the Korn Shell as the Standard Shell
    A.1. The Bourne Shell
~ (tilde)
  1.6.1.2. Tilde notation
  7.3. Command-line Processing
  7.3.1. Quoting
  A.1. The Bourne Shell
  A.2. The IEEE 1003.2 POSIX Shell Standard
  in public domain Korn shell : A.4. pdksh
  within double quotes : 3.4.1. Variables and Quoting
  within variable expressions : A.7. The Future of the Korn Shell

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