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Index: F

$^F variable: 29.2.38. fileno

29.2.38. fileno

%FIELDS hash: 28.2. Special Variables in Alphabetical Order

@F array: 28.2. Special Variables in Alphabetical Order

-F (pattern to split on)command-line switch: 19.1.3. Switches

failed matches, searching past position of: 5.6.4. Progressive Matching

fallback overloading key: 13.5. When an Overload Handler Is Missing (nomethod and fallback)

false values: 1.2.1.1. Singularities

FAQ, Perl online: 24.1. Common Goofs for Novices

Fast CGI protocol, using: 32.1.9. World Wide Web

Fatal module: 32.1.13. Perl Language Extensions and Internals

fcntl function: 29.2.37. fcntl

security risks associated with: 23.2.3. Temporary Files

Fcntl module: 32.1.7. Operating System Interfaces

fcntl syscall, filehandle close-on exec flag, manipulating: 16.2.2. Passing Filehandles

field declarations with use fields pragma: 12.7.1. Field Declarations with use fields

field separator, specifying different: 19.1.3. Switches

fields module: 32.1.13. Perl Language Extensions and Internals

FIFOs: 16.3.4. Named Pipes

__FILE__

24.5.2. Generating Perl in Other Languages
2.6.8. Other Literal Tokens

file conversions, Perl modules for: 22.1. The CPAN modules Directory

file descriptors: 29.2.38. fileno

29.2.141. select (ready file descriptors)
filehandles, passing with: 16.2.2. Passing Filehandles
passing through environment variable or command-line option: 16.2.2. Passing Filehandles
returning for tied filehandles: 14.4.1. Filehandle-Tying Methods

file test operators: 3.10. Named Unary and File Test Operators

-p, checking for FIFO: 16.3.4. Named Pipes

race conditions with: 23.2.2. Handling Race Conditions

File::Basename module: 25.3. Files and Filesystems

32.1.4. Filenames, Filesystems, and File Locking

File::CheckTree module: 32.1.4. Filenames, Filesystems, and File Locking

File::chmod module: 29.2.10. chmod

File::Compare module: 32.1.4. Filenames, Filesystems, and File Locking

File::Copy module: 32.1.4. Filenames, Filesystems, and File Locking

File::DosGlob module: 32.1.4. Filenames, Filesystems, and File Locking

File::Find module: 32.1.4. Filenames, Filesystems, and File Locking

File::Glob module: 32.1.4. Filenames, Filesystems, and File Locking

fileglob operator: 2.11.3. Filename Globbing Operator

FileHandle module: 7.1. Format Variables

7.2.1. Accessing Formatting Internals
32.1.5. Filehandle, Directory Handle, and Stream I/O Utilities

filehandle-tying: 14.4.1. Filehandle-Tying Methods

filehandles: 1.4. Filehandles

anonymous: 8.2.4. Handle References

angle operator and: 2.11.2. Line Input (Angle) Operator

creating: 1.4. Filehandles

duplicating, reasons for: 29.2.104. open

ending with _TOP: 7. Formats

28.2. Special Variables in Alphabetical Order

file locks on: 16.2.1. File Locking

formats associated with, default names of: 7. Formats

functions dealing with: 29.1. Perl Functions by Category

implicit referencing in: 8.1. What Is a Reference?

local, creating: 29.2.87. local

localizing: 2.10. Typeglobs and Filehandles

names for: 2.5. Names

object methods for, using: 32.1.5. Filehandle, Directory Handle, and Stream I/O Utilities

open function: 29.2.104. open

passing: 6.4. Prototypes

passing in IPC: 16.2.2. Passing Filehandles

through standard filehandles: 16.2.2. Passing Filehandles

piped, explicitly closing: 29.2.104. open

positioning file pointer for: 29.2.138. seek

reading bytes of data from: 29.2.120. read

references to: 8.2.4. Handle References

selecting for output: 29.2.140. select (output filehandle)

SelectSaver module: 32.1.5. Filehandle, Directory Handle, and Stream I/O Utilities

syslog tying output to: 14.6. Tie Modules on CPAN

tying: 14.4. Tying Filehandles

creative filehandles: 14.4.2. Creative Filehandles
methods for: 14.4.1. Filehandle-Tying Methods

typeglobs for: 2.10. Typeglobs and Filehandles

use instead of filenames, security benefits of: 23.2.2. Handling Race Conditions

filename globbing operator (see glob operator)

filenames: 2.6.8. Other Literal Tokens

& (ampersand) in: 29.2.104. open
changing name of: 29.2.128. rename
expansions of: 29.2.69. glob
external data in, security risks of: 23.1.2. Cleaning Up Your Environment
getting from symbolic links: 29.2.123. readlink
globbing: 25.4. System Interaction
%INC hash of: 28.2. Special Variables in Alphabetical Order
linking symbolically: 29.2.169. symlink
linking with hard links: 29.2.85. link
mode, separating from: 29.2.104. open
viewing different program or eval statement: 20.2.5. Locating Code

fileno (see file descriptors)

fileno function: 29.2.38. fileno

File::Path module: 32.1.4. Filenames, Filesystems, and File Locking

access and modification times: 29.2.165. stat

29.2.193. utime

accessing under reduced privileges: 23.1.3. Accessing Commands and Files Under Reduced Privileges

ages for: 3.10. Named Unary and File Test Operators

changing name of: 29.2.128. rename

closing: 29.2.16. close

core: 19.1.3. Switches

deleting: 29.2.188. unlink

do FILE operator: 29.2.27. do (file)

end-of-file: 29.2.31. eof

functions dealing with: 29.1. Perl Functions by Category

getting statistics of: 29.2.165. stat

in interprocess communication: 16.2. Files

locking mechanisms: 16.2.1. File Locking
passing filehandles: 16.2.2. Passing Filehandles

lexically scoped variables and: 2.5.1. Name Lookups

modules, autoloading: 10.2. Autoloading

modules for cross-platform access methods: 32.1.4. Filenames, Filesystems, and File Locking

open function: 29.2.104. open

opening via low-level system call: 29.2.171. sysopen

ownership and group, changing: 29.2.13. chown

path components, separators for: 25.3. Files and Filesystems

Perl module, housing in single: 10. Packages

Perl modules for: 22.1. The CPAN modules Directory

22.1. The CPAN modules Directory

permissions: 29.2.10. chmod

29.2.171. sysopen
29.2.186. umask

portably opening: 25.4. System Interaction

read in binary mode: 29.2.6. binmode

reading via low-level system call: 29.2.172. sysread

renaming, program for: 29.2.32. eval

returning current position for: 29.2.176. tell

scopes: 4.8.2. Lexically Scoped Variables: my

symbolically linking: 29.2.169. symlink

test operators: 1.5.7. Some File Test Operators

text/binary distinction: 29.2.104. open

truncating: 29.2.183. truncate

Win32API::File module: 32.1.20. Microsoft-Related Modules

writing via low-level system call: 29.2.175. syswrite

File::Spec module: 25.3. Files and Filesystems

32.1.4. Filenames, Filesystems, and File Locking

File::Spec::Functions module: 32.1.4. Filenames, Filesystems, and File Locking

File::Spec::Mac module: 32.1.4. Filenames, Filesystems, and File Locking

File::Spec::OS2 module: 32.1.4. Filenames, Filesystems, and File Locking

File::Spec::Unix module: 32.1.4. Filenames, Filesystems, and File Locking

File::Spec::VMS module: 32.1.4. Filenames, Filesystems, and File Locking

32.1.4. Filenames, Filesystems, and File Locking

File::Spec::Win32 module: 32.1.4. Filenames, Filesystems, and File Locking

File::stat module: 32.1.4. Filenames, Filesystems, and File Locking

portability: 25.3. Files and Filesystems

File::Temp module, dealing with race conditions: 23.2.3. Temporary Files

filtering output with forking open: 16.3.2. Talking to Yourself

24.5.3. Source Filters
1.8. List Processing

find command: 1.7. Regular Expressions

traversing file trees like: 32.1.4. Filenames, Filesystems, and File Locking

FindBin module: 32.1.17. Module Installation Support

findstr function: 1.7. Regular Expressions

1.7. Regular Expressions

fixed 8-bit chracters: 15.1. Building Character

flags: 5.2.1. Pattern Modifiers

19.1.3. Switches
(see also modifiers, switches)

floating-point numbers: 2.6. Scalar Values

29.2.108. pack
computer storage, order of: 25.2. Endianness and Number Width
Math::BigFloat module: 32.1.1. Data Types
rand function, returning: 29.2.119. rand

flock function: 14.1.1. Scalar-Tying Methods

16.2.1. File Locking
29.2.39. flock
alarms and: 16.1.3. Timing Out Slow Operations

flow of program control, functions for: 29.1. Perl Functions by Category

flushing buffers: 28.2. Special Variables in Alphabetical Order

fmt (Unix utility): 7.1. Format Variables

fonts, Perl modules for: 22.1. The CPAN modules Directory

footers: 7.2. Footers

for, as an alias of foreach: 4.4.3. foreach Loops

for loops: 1.6.2.2. The for statement

searching and replacing elements in arrays: 5.2.3.1. Modifying strings en passant

for modifier: 4.1. Simple Statements

4.4.2. for Loops

foreach loops: 1.6.2.3. The foreach statement

4.4.3. foreach Loops
24.2.1. Time Efficiency
aliasing capability, using: 4.5.1. Case Structures
loop variable, Perl vs. shell programming: 24.1.4. Shell Traps
Perl versions, changes in: 24.1.5. Previous Perl Traps
searching and replacing elements in arrays: 5.2.3.1. Modifying strings en passant

foreach modifier: 4.1. Simple Statements

fork function: 29.2.40. fork

child processes, inheriting parent filehandles: 16.2.2. Passing Filehandles
fork-open: 16.3.2. Talking to Yourself
locks, inheriting across calls to: 29.2.39. flock
pipe open, avoiding shell in: 23.1.3. Accessing Commands and Files Under Reduced Privileges
portability of: 25.5. Interprocess Communication (IPC)
servers, cloning themselves with: 16.5.2. Networking Servers
zombie processes and: 16.1.2. Reaping Zombies

fork syscall: 16.3.1. Anonymous Pipes

forks: 29.2.104. open

cloned interpreter on Windows: 17.1. The Process Model
fork open: 29.2.104. open
open command, two-argument form: 29.2.104. open

form feed: 28.2. Special Variables in Alphabetical Order

formal arguments: 28.2. Special Variables in Alphabetical Order

format: 28.2. Special Variables in Alphabetical Order

format function

declaration: 29.2.41. format
output accumulator: 29.2.42. formline

$FORMAT_FORMFEED: 28.2. Special Variables in Alphabetical Order

$FORMAT_LINE_BREAK_CHARACTERS: 28.2. Special Variables in Alphabetical Order

$FORMAT_LINES_LEFT: 28.2. Special Variables in Alphabetical Order

$FORMAT_LINES_PER_PAGE: 28.2. Special Variables in Alphabetical Order

$FORMAT_NAME: 28.2. Special Variables in Alphabetical Order

$FORMAT_PAGE_NUMBER: 28.2. Special Variables in Alphabetical Order

formats: 7. Formats

accessing formatting internals: 7.2.1. Accessing Formatting Internals
argument lists for, evaluating in list context: 24.1.5. Previous Perl Traps
B::Xref module, cross-references with C: 18.6. Code Development Tools
characters in: 29.2.108. pack
declaring: 7. Formats
fmt (Unix utility): 7.1. Format Variables
footers: 7.2. Footers
integers: 29.2.108. pack
lexical variables in: 7. Formats
pack/unpack: 29.2.108. pack
for strings: 29.2.162. sprintf
top-of-form processing: 7. Formats
variables: 7.1. Format Variables

$FORMAT_TOP_NAME: 28.2. Special Variables in Alphabetical Order

formline function: 29.2.42. formline

formline operator: 7.2.1. Accessing Formatting Internals

Fortran: 2.2. Molecules

frame option (debugger): 20.3.3. Debugger Options

free-form languages: 2.2. Molecules

fully-qualified names: 2.5. Names

function calls: 3.1. Terms and List Operators (Leftward)

pipe, low-level for bi-directional communication: 16.3.3. Bidirectional Communication

function templates, closures as: 8.3.7.1. Closures as function templates

functions: 1.2.2. Verbs

6. Subroutines

29. Functions

autoloading: 10.2. Autoloading

12.5.4. Method Autoloading

built-in, listing by type: 32.1.16. Documentation Support

by category: 29.1. Perl Functions by Category

byte-oriented wrappers for: 15.2. Effects of Character Semantics

C library: 29. Functions

debugger, calling internal: 20.3.2. Customizing with Init Files

debugger customization: 20.5.1. Writing Your Own Debugger

default arguments, avoiding errors with: 24.1.2. Frequently Ignored Advice

generation of: 8.3.7. Closures

hashes of: 9.5. Hashes of Functions

interpolating: 14.2.2. Notational Convenience

in list or scalar context: 29. Functions

modules, exporting to programs: 11.2.1. Module Privacy and the Exporter

named unary operators: 3.10. Named Unary and File Test Operators

names for: 24.3. Programming with Style

operators and: 3. Unary and Binary Operators

for overloading: 13.7. Public Overload Functions

overriding: 11.3. Overriding Built-in Functions

Perl, varying across platforms: 25. Portable Perl

Perl, wrapping around C: 21.3.1. XS and XSUBs

references, using for both input and output: 6.3. Passing References

return operators in: 4.4.4. Loop Control

returning tainted data: 29.2. Perl Functions in Alphabetical Order

signal-handling: 16.1. Signals

socket-related in Perl: 16.5. Sockets

temporary filenames, generating: 23.2.3. Temporary Files

Thread module: 17.2.1. The Thread Module

funny characters: 14. Tied Variables

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