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Index: P

• -p command-line option, and inplace editing : Variable-Length ( Text) Databases
• -p operator : The -x File Tests
• pack format string : Packing and Unpacking Binary Data
• pack( ) operator : Packing and Unpacking Binary Data
• • example of : Fixed-Length Random Access Databases
• page length
• • changing, in formats : Changing the Page Length
  • default, for top-of-page format : The Top-of-Page Format
• page position, changing, in formats : Changing the Position on the Page
• param( )
• • Passing Parameters via CGI
  • Other Form Elements
• parameters : Making It a Bit More Modular
• • passing via CGI : Passing Parameters via CGI
• parent process : Using fork
• parentheses
• • array literals and : Literal Representation
  • as optional for the keys( ) operator : The keys Function
  • chdir( ) operator and : Moving Around the Directory Tree
  • forcing array context with : Assignment
  • as memory in regular expressions
  • • Precedence
    • Parentheses as memory
  • precedence and
  • • Operator Precedence and Associativity
    • Precedence
  • print( ) operator and : Using print for Normal Output
  • values( ) operator and : The values Function
• password file
• • accessing
  • • Exercises
    • Getting Password and Group Information
  • random access in : Getting Password and Group Information
  • reading from, example : Using Filehandles
  • sequential access to : Getting Password and Group Information
• PATH environment variable, managing : Using system and exec
• Pathologically Eclectic Rubbish Lister : History of Perl
• percent sign (%)
• • as modulus operator : Operators for Numbers
• Perl : Perl and the Web: Beyond CGI Developing
• • availability of : Availability
  • CGI developing : (see CGI programs)
• Perl programs, making executable : Basic Concepts
• Perl standard library : Input from the Diamond Operator
• Perl: The Motion Picture : Packing and Unpacking Binary Data
• permission bits, in dbmopen( ) : Opening and Closing DBM Hashes
• permissions
• • CGI programs and
  • • Creating a Guesttutorial Program
    • Troubleshooting CGI Programs
  • modifying : Modifying Permissions
• pi
• • computing with : Scalar Data
  • obscure reference to : Packing and Unpacking Binary Data
• pop( ) operator : The push and pop Functions
• • example of : Control Structures
• popen library function, emulating : Using Processes as Filehandles
• popup menus
• • Other Form Elements
  • References
• powers of ten, example of, with substr( ) : Extracting and Replacing a Substring
• Practical Extraction and Report Language
• • History of Perl
  • What Is a Format?
• precedence : Operator Precedence and Associativity
• • parentheses and
  • • Operator Precedence and Associativity
    • Precedence
  • in regular expressions : Precedence
• print( ) operator
• • Output with print
  • Using print for Normal Output
  • $_ and : The foreach Statement
  • array literals and : Literal Representation
  • example of
  • • The "Hello, World" Program
    • The Final Programs
  • filehandle keyword and : Warning Someone When Things Go Astray
  • return value of : Using print for Normal Output
  • writes to the same filehandle : The Top-of-Page Format
• printenv command, emulating : Using system and exec
• printf( ) operator : Using printf for Formatted Output
• • example of
  • • Control Structures
    • Basic I/O
    • Process Management
    • Exercises
• processes
• • creating : Using system and exec
  • exit value : Using fork
  • filehandles as : Using Processes as Filehandles
  • launching : Summary of Process Operations
  • opening for writing with filehandle : Using Processes as Filehandles
• products, finding : Labeled Blocks
• prompt, example of : Asking Questions and Remembering the Result
• publishing systems : Custom Publishing Systems
• push( ) operator : The push and pop Functions
• • example of : System Database Access
• pwd command : Moving Around the Directory Tree

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