Index: F

• failure, returning from subroutines : Returning Failure
• false strings : Introduction
• fcntl( )
• • Doing Non-Blocking I/O
  • Returning Failure
• fdirs program (example) : Processing All Files in a Directory Recursively
• fdopen( ) (IO::Handle) : Opening and Closing File Descriptors by Number
• FETCH( ) : Creating Magic Variables with tie
• fetching URLs from Perl scripts : Fetching a URL from a Perl Script
• fifolog program (example) : Making a Process Look Like a File with Named Pipes
• FIFOs (named pipes) : Making a Process Look Like a File with Named Pipes
• file access
• • (see also directories; file contents)
  • Introduction
  • Introduction
  • access modes : Introduction
  • caching open filehandles : Caching Open Output Filehandles
  • copying filehandles : Copying Filehandles
  • copying or moving files : Copying or Moving a File
  • deleting files : Deleting a File
  • editing files : (see file contents)
  • filtering filename input : Writing a Filter
  • flushing output : Flushing Output
  • locking files
  • • Locking a File
    • Program: netlock
    • region-specific locks : Program: lockarea
  • non-blocking I/O : Doing Non-Blocking I/O
  • number of bytes to read : Determining the Number of Bytes to Read
  • opening files : Opening a File
  • opening/closing file descriptors : Opening and Closing File Descriptors by Number
  • printing to multiple filehandles : Printing to Many Filehandles Simultaneously
  • processing all files in directories
  • • Processing All Files in a Directory
    • Processing All Files in a Directory Recursively
  • reading from multiple filehandles : Reading from Many Filehandles Without Blocking
  • storing files in program text : Storing Files Inside Your Program Text
  • timestamps : Getting and Setting Timestamps
• file contents
• • (see also directories; file access)
  • Introduction
  • Introduction
  • adding records to wtmp file : Program: tailwtmp
  • configuration files, reading : Reading Configuration Files
  • continually growing files, reading : Trailing a Growing File
  • counting lines/paragraphs/records : Counting Lines (or Paragraphs or Records) in a File
  • extracting single line : Reading a Particular Line in a File
  • fixed-length records
  • • Introduction
    • Reading Fixed-Length Records
  • modifying
  • • with -i option : Modifying a File in Place with -i Switch
    • with temporary files : Modifying a File in Place with Temporary File
    • without temporary files : Modifying a File in Place Without a Temporary File
  • processing all words in : Processing Every Word in a File
  • processing binary files : Processing Binary Files
  • random access I/O : Using Random-Access I/O
  • random lines from : Picking a Random Line from a File
  • randomizing line order : Randomizing All Lines
  • reading backwards : Reading a File Backwards by Line or Paragraph
  • reading lines with continuation characters : Reading Lines with Continuation Characters
  • reading strings from binary files : Reading a String from a Binary File
  • reading/writing hash records to file : Reading and Writing Hash Records to Text Files
  • tctee program : Program: tctee
  • testing for trustworthiness : Testing a File for Trustworthiness
  • text files as database arrays : Treating a Text File as a Database Array
  • variable-length text fields : Processing Variable-Length Text Fields
  • viewing lastlog file information : Program: laston
• file descriptors, opening/closing : Opening and Closing File Descriptors by Number
• file stat cache (_) : Introduction
• __FILE__ symbol : Determining Current Function Name
• File::Basename module : Splitting a Filename into Its Component Parts
• File::Copy module : Copying or Moving a File
• File::Find module
• • Processing All Files in a Directory Recursively
  • Removing a Directory and Its Contents
• File::KGlob module : Globbing, or Getting a List of Filenames Matching a Pattern
• File::LockDir module : Program: netlock
• File::stat module
• • Trailing a Growing File
  • Introduction
• FileCache module : Caching Open Output Filehandles
• FileHandler module : Introduction
• filehandles : Introduction
• • caching open filehandles : Caching Open Output Filehandles
  • copying : Copying Filehandles
  • local
  • • Storing Filehandles in Variables
    • Saving Global Values
  • non-blocking I/O : Doing Non-Blocking I/O
  • passing
  • • Storing Filehandles in Variables
    • Saving Global Values
    • Determining the Caller's Package
  • printing to multiple simultaneously : Printing to Many Filehandles Simultaneously
  • reading from many : Reading from Many Filehandles Without Blocking
  • reporting filenames in errors : Making Perl Report Filenames in Errors
  • storing as variables
  • • Introduction
    • Storing Filehandles in Variables
  • tied : Creating Magic Variables with tie
• filenames
• • expanding tildes in : Expanding Tildes in Filenames
  • filtering as input : Writing a Filter
  • matching with patterns : Globbing, or Getting a List of Filenames Matching a Pattern
  • multiple, for same file : Recognizing Two Names for the Same File
  • parsing : Splitting a Filename into Its Component Parts
  • renaming : Renaming Files
  • reporting in errors : Making Perl Report Filenames in Errors
  • sorting
  • • Introduction
    • Program: lst
  • strange, opening files with : Opening Files with Unusual Filenames
• fileparse( ) : Splitting a Filename into Its Component Parts
• files
• • deleting last line of : Removing the Last Line of a File
  • temporary : Creating Temporary Files
• filesystem : (see directories)
• filtering filenames as input : Writing a Filter
• filtering output : Filtering Your Own Output
• FindBin module : Keeping Your Own Module Directory
• finddepth( ) : Removing a Directory and Its Contents
• finding
• • most common anything : Finding the Most Common Anything
  • patterns : (see pattern matching; regular expressions)
• findlogin program (example) : Writing a Filter
• FIONREAD call : Determining the Number of Bytes to Read
• firewalls, connecting through : Program: fwdport
• fisher_yates_shuffle( ) : Randomizing an Array
• fixed-length records
• • Introduction
  • Reading Fixed-Length Records
• FixNum class : Overloading Operators
• fixstyle program (example) : Program: fixstyle
• fixstyle2 program (example) : Program: fixstyle
• flattened lists : Introduction
• floating-point numbers : Introduction
• • comparing : Comparing Floating-Point Numbers
  • rounding : Rounding Floating-Point Numbers
• flock( )
• • Locking a File
  • Program: netlock
• floor( ) : Rounding Floating-Point Numbers
• flushing output : Flushing Output
• fmt program : Reformatting Paragraphs
• folded_demo program (example) : Creating Magic Variables with tie
• foodfind program : Inverting a Hash
• =for escape pod directive : Documenting Your Module with Pod
• foreach( ) : Finding the First List Element That Passes a Test
• fork( )
• • (see also processes)
  • Introduction
  • Communicating Between Related Processes
  • Executing Commands Without Shell Escapes
  • avoiding zombies : Avoiding Zombie Processes
  • closing socket after : Closing a Socket After Forking
  • forking servers : Forking Servers
  • non-forking servers : Non-Forking Servers
  • pre-forking servers : Pre-Forking Servers
• forms (HTML) : Introduction
• • saving or emailing : Saving a Form to a File or Mail Pipe
  • sticky widgets : Creating Sticky Widgets
  • submitting : Automating Form Submission
• Frame widget (Tk) : Creating Menus with Tk
• fresh hyperlinks, finding : Finding Fresh Links
• Friedl, Jeffrey : Speeding Up Interpolated Matches
• FTP clients : Being an FTP Client
• full-screen mode : Introduction
• functions : (see subroutines)
• • interpolating within strings : Interpolating Functions and Expressions Within Strings
  • methods vs. : Writing an Inheritable Class
  • references to : Taking References to Functions
• fuzzy matching : Approximate Matching
• fwdport program (example) : Program: fwdport