Index

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# Index: Symbols and Numbers

0666, as permission : 13.5. Modifying Permissions
\1, \2, ... in regular expressions
  7.3.2.3. Parentheses as memory
  7.4.5. Special Read-Only Variables
& (ampersand)
  && operator : 9.6. && and || as Control Structures
  query strings and : 19.2. Your CGI Program in Context
* (asterisk)
  **= operator : 2.6.1. Binary Assignment Operators
  ** (exponentiation) operator : 2.4.1. Operators for Numbers
  in pack format string : 16.2. Packing and Unpacking Binary Data
  as prefix : D.7. Symbol Table Manipulation with *FRED
  in regular expressions : 7.3.2.2. Multipliers
@ (at sign)
  @*, in formats : 11.4.3. Multiline Fields
  @_ (subroutine arglist)
    1.5.9. Making It a Bit More Modular
    8.4. Arguments
  as array name prefix : 1.5.5. More than One Secret Word
  as format field delimiter : 11.4.1. Text Fields
  as prefix for array variables : 3.3. Variables
` (backquotes) : 1.5.12. Warning Someone When Things Go Astray
  as command invocation : 14.2. Using Backquotes
  example of : A.13. Chapter 14, Process Management
\ (backslash) : 2.3.2. Double-Quoted Strings
  \@ reference notation : 19.7.1. References
  escapes : 2.3.1. Single-Quoted Strings
  in system( ) argument : 14.1. Using system and exec
  in regular expressions
    7.3.1. Single-Character Patterns
    7.3.3. Anchoring Patterns
    as memory access : 7.3.2.3. Parentheses as memory
! operator
  example of : A.13. Chapter 14, Process Management
  as logical-not operator : 1.5.9. Making It a Bit More Modular
  != operator : 2.4.2. Operators for Strings
[ (left bracket) in double-quoted strings : 3.7. Variable Interpolation of Arrays
[ ] (brackets) reference notation : 19.7.1. References
^ (caret)
  as anchor in regular expressions : 7.3.3. Anchoring Patterns
  as filled-field in formats : 11.4.4. Filled Fields
  in regular expressions : 7.3.1. Single-Character Patterns
{} (curly braces)
  in double-quoted strings : 2.6.4. Interpolation of Scalars into Strings
  in regular expressions : 7.3.2.2. Multipliers
  required in if statements : 4.2. The if/unless Statement
$ (dollar sign)
  $1, $2,... backreferences : 7.4.5. Special Read-Only Variables
  $a, $b, ..., sorting with : 15.4. Advanced Sorting
  $& (match string) : 7.4.5. Special Read-Only Variables
  $` (before-match string) : 7.4.5. Special Read-Only Variables
  $^ variable : 11.6.3. Changing the Top-of-Page Format Name
  $^I variable : 17.5. Variable-Length ( Text) Databases
  $^T variable : 10.5. The -x File Tests
  $: variable : 11.4.4. Filled Fields
  $= variable : 11.6.5. Changing the Position on the Page
  $# for arrays : 3.4.2. Array Element Access
  $- variable : 11.6.5. Changing the Position on the Page
    interaction with $= variable : 11.6.5. Changing the Position on the Page
  $% (special variable), example of : 1.5.14. Listing the Secret Words
  $' (after-match string) : 7.4.5. Special Read-Only Variables
  $/ variable
    6.1. Input from STDIN
    14.2. Using Backquotes
  $~ variable : 11.6.2. Changing the Format Name
  $_
    foreach statement and : 4.5. The foreach Statement
    implicit assignment to : 6.1. Input from STDIN
    selecting other with =~ operator : 7.4.1. Selecting a Different Target (the =~ Operator)
  $_[0] : 8.4. Arguments
  removing significance in strings : 2.6.4. Interpolation of Scalars into Strings
  as scalar variable prefix : 2.5. Scalar Variables
. (dot)
  .. for parent directory : 13.3.1. About Hard and Soft Links
  .. list construction operator : 3.2. Literal Representation
  .= operator : 2.6.1. Binary Assignment Operators
  as current directory : A.11. Chapter 12, Directory Access
  example of : A.7. Chapter 8, Functions
  in regular expressions : 7.3.1. Single-Character Patterns
  as self-name for directory : 13.3.1. About Hard and Soft Links
= (equal sign)
  == operator : 2.4.2. Operators for Strings
  => operator : 19.7.2. Fancier Calling Sequences
  =~ operator : 7.4.1. Selecting a Different Target (the =~ Operator)
    example of : 1.5.8. Making It Fair for the Rest
    substitution and : 7.5. Substitutions
    tr operator and : 15.5. Transliteration
> (greater than) : 2.4.2. Operators for Strings
  >&, in open( ) : 14.5. Summary of Process Operations
  >= operator : 2.4.2. Operators for Strings
#!/usr/bin/perl line : 1.4. Basic Concepts
- (hyphen)
  -= operator : 11.4.2. Numeric Fields
  -- operator : 2.6.2. Autoincrement and Autodecrement
  in regular expression ranges : 7.3.1. Single-Character Patterns
< (less than) : 2.4.2. Operators for Strings
  < and > as globbing delimiters : 12.2. Globbing
  <= operator : 2.4.2. Operators for Strings
  <=> : (see spaceship (<=>) operator)
  format field characters : 11.4.1. Text Fields
  <\> : (see diamond operator)
% (percent sign) as associative array prefix
  1.5.6. Giving Each Person a Different Secret Word
  5.2. Hash Variables
+ (plus sign) in regular expressions : 7.3.2.2. Multipliers
+ (plus)
  modifying open( ) : 17.4. Fixed-Length Random Access Databases
  += operator
    A.3. Chapter 4, Control Structures
    2.6.1. Binary Assignment Operators
  ++ operator
    2.6.2. Autoincrement and Autodecrement
    14.1. Using system and exec
# (pound sign)
  as comment character : 1.4. Basic Concepts
  as format field characters : 11.4.2. Numeric Fields
? (question mark) in regular expressions : 7.3.2.2. Multipliers
; (semicolon) as statement terminator : 1.5.1. The "Hello, World" Program
/ (slash)
  changing regular expressions and : 7.4.3. Using a Different Delimiter
  choosing alternate to, in substitution : 7.5. Substitutions
  regular expression delimiter : 7.2. Simple Uses of Regular Expressions
~ (tilde) in formats : 11.4.4. Filled Fields
_ (underscore) in variable names : 2.5. Scalar Variables
| (vertical bar)
  as format field characters : 11.4.1. Text Fields
  open( ) and
    1.5.12. Warning Someone When Things Go Astray
    14.3. Using Processes as Filehandles
  in regular expressions : 7.3.2.4. Alternation
|| (logical-or) operator : 1.5.9. Making It a Bit More Modular
  as control structure : 9.6. && and || as Control Structures
  die( ) and : 10.3. A Slight Diversion: die
  example of
    A.7. Chapter 8, Functions
    A.15. Chapter 16, System Database Access
    15.4. Advanced Sorting

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