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Index: F

$^F variable: fileno
- fileno
%FIELDS hash: Special Variables in Alphabetical Order
@F array: Special Variables in Alphabetical Order
-F (pattern to split on)command-line switch: Switches
failed matches, searching past position of: Progressive Matching
fallback overloading key: When an Overload Handler Is Missing (nomethod and fallback)
false values: Singularities
FAQ, Perl online: Common Goofs for Novices
Fast CGI protocol, using: World Wide Web
Fatal module: Perl Language Extensions and Internals
fcntl function: fcntl
- security risks associated with: Temporary Files
Fcntl module: Operating System Interfaces
fcntl syscall, filehandle close-on exec flag, manipulating: Passing Filehandles
field declarations with use fields pragma: Field Declarations with use fields
field separator, specifying different: Switches
fields module: Perl Language Extensions and Internals
FIFOs: Named Pipes
__FILE__
- Generating Perl in Other Languages
- Other Literal Tokens

file conversions, Perl modules for: The CPAN modules Directory
file descriptors: fileno

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

file test operators: Named Unary and File Test Operators

-p, checking for FIFO: Named Pipes

race conditions with: Handling Race Conditions

File::Basename module: Files and Filesystems

Filenames, Filesystems, and File Locking

File::CheckTree module: Filenames, Filesystems, and File Locking
File::chmod module: chmod
File::Compare module: Filenames, Filesystems, and File Locking
File::Copy module: Filenames, Filesystems, and File Locking
File::DosGlob module: Filenames, Filesystems, and File Locking
File::Find module: Filenames, Filesystems, and File Locking
File::Glob module: Filenames, Filesystems, and File Locking
fileglob operator: Filename Globbing Operator
FileHandle module: Format Variables

filehandle-tying: Filehandle-Tying Methods
filehandles: Filehandles

anonymous: Handle References
angle operator and: Line Input (Angle) Operator
creating: Filehandles
duplicating, reasons for: open
ending with _TOP: Formats
- Special Variables in Alphabetical Order
file locks on: File Locking
formats associated with, default names of: Formats
functions dealing with: Perl Functions by Category
implicit referencing in: What Is a Reference?
local, creating: local
localizing: Typeglobs and Filehandles
names for: Names
object methods for, using: Filehandle, Directory Handle, and Stream I/O Utilities
open function: open
passing: Prototypes
passing in IPC: Passing Filehandles
- through standard filehandles: Passing Filehandles
piped, explicitly closing: open
positioning file pointer for: seek
reading bytes of data from: read
references to: Handle References
selecting for output: select (output filehandle)
SelectSaver module: Filehandle, Directory Handle, and Stream I/O Utilities
syslog tying output to: Tie Modules on CPAN
tying: Tying Filehandles
- creative filehandles: Creative Filehandles
- methods for: Filehandle-Tying Methods
typeglobs for: Typeglobs and Filehandles
use instead of filenames, security benefits of: Handling Race Conditions

filename globbing operator (see glob operator)
filenames: Other Literal Tokens

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

fileno (see file descriptors)
fileno function: fileno
File::Path module: Filenames, Filesystems, and File Locking

access and modification times: stat
- utime
accessing under reduced privileges: Accessing Commands and Files Under Reduced Privileges
ages for: Named Unary and File Test Operators
changing name of: rename
closing: close
core: Switches
deleting: unlink
do FILE operator: do (file)
end-of-file: eof
functions dealing with: Perl Functions by Category
getting statistics of: stat
in interprocess communication: Files
- locking mechanisms: File Locking
- passing filehandles: Passing Filehandles
lexically scoped variables and: Name Lookups
modules, autoloading: Autoloading
modules for cross-platform access methods: Filenames, Filesystems, and File Locking
open function: open
opening via low-level system call: sysopen
ownership and group, changing: chown
path components, separators for: Files and Filesystems
Perl module, housing in single: Packages
Perl modules for: The CPAN modules Directory
- The CPAN modules Directory
permissions: chmod
- sysopen
- umask
portably opening: System Interaction
read in binary mode: binmode
reading via low-level system call: sysread
renaming, program for: eval
returning current position for: tell
scopes: Lexically Scoped Variables: my
symbolically linking: symlink
test operators: Some File Test Operators
text/binary distinction: open
truncating: truncate
Win32API::File module: Microsoft-Related Modules
writing via low-level system call: syswrite

File::Spec module: Files and Filesystems

Filenames, Filesystems, and File Locking

File::Spec::Functions module: Filenames, Filesystems, and File Locking
File::Spec::Mac module: Filenames, Filesystems, and File Locking
File::Spec::OS2 module: Filenames, Filesystems, and File Locking
File::Spec::Unix module: Filenames, Filesystems, and File Locking
File::Spec::VMS module: Filenames, Filesystems, and File Locking

Filenames, Filesystems, and File Locking

File::Spec::Win32 module: Filenames, Filesystems, and File Locking
File::stat module: Filenames, Filesystems, and File Locking

portability: Files and Filesystems

File::Temp module, dealing with race conditions: Temporary Files
filtering output with forking open: Talking to Yourself

find command: Regular Expressions

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

FindBin module: Module Installation Support
findstr function: Regular Expressions

Regular Expressions

fixed 8-bit chracters: Building Character
flags: Pattern Modifiers

Switches
(see also modifiers, switches)

floating-point numbers: Scalar Values

pack
computer storage, order of: Endianness and Number Width
Math::BigFloat module: Data Types
rand function, returning: rand

flock function: Scalar-Tying Methods

flow of program control, functions for: Perl Functions by Category
flushing buffers: Special Variables in Alphabetical Order

fmt (Unix utility): Format Variables
fonts, Perl modules for: The CPAN modules Directory
footers: Footers
for, as an alias of foreach: foreach Loops
for loops: The for statement

searching and replacing elements in arrays: Modifying strings en passant

for modifier: Simple Statements

for Loops

foreach loops: The foreach statement

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

foreach modifier: Simple Statements
fork function: fork

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

fork syscall: Anonymous Pipes
forks: open

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

form feed: Special Variables in Alphabetical Order
formal arguments: Special Variables in Alphabetical Order

format: Special Variables in Alphabetical Order
format function

declaration: format
output accumulator: formline

$FORMAT_FORMFEED: Special Variables in Alphabetical Order
$FORMAT_LINE_BREAK_CHARACTERS: Special Variables in Alphabetical Order
$FORMAT_LINES_LEFT: Special Variables in Alphabetical Order
$FORMAT_LINES_PER_PAGE: Special Variables in Alphabetical Order
$FORMAT_NAME: Special Variables in Alphabetical Order
$FORMAT_PAGE_NUMBER: Special Variables in Alphabetical Order
formats: Formats

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

$FORMAT_TOP_NAME: Special Variables in Alphabetical Order
formline function: formline
formline operator: Accessing Formatting Internals
Fortran: Molecules
frame option (debugger): Debugger Options
free-form languages: Molecules
fully-qualified names: Names
function calls: Terms and List Operators (Leftward)

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

function templates, closures as: Closures as function templates
functions: Verbs

Subroutines
Functions
Functions
autoloading: Autoloading
- Method Autoloading
built-in, listing by type: Documentation Support
by category: Perl Functions by Category
byte-oriented wrappers for: Effects of Character Semantics
C library: Functions
debugger, calling internal: Customizing with Init Files
debugger customization: Writing Your Own Debugger
default arguments, avoiding errors with: Frequently Ignored Advice
generation of: Closures
hashes of: Hashes of Functions
interpolating: Notational Convenience
in list or scalar context: Functions
modules, exporting to programs: Module Privacy and the Exporter
named unary operators: Named Unary and File Test Operators
names for: Developing with Style
operators and: Unary and Binary Operators
for overloading: Public Overload Functions
overriding: Overriding Built-in Functions
Perl, varying across platforms: Portable Perl
Perl, wrapping around C: XS and XSUBs
references, using for both input and output: Passing References
return operators in: Loop Control
returning tainted data: Perl Functions in Alphabetical Order
signal-handling: Signals
socket-related in Perl: Sockets
temporary filenames, generating: Temporary Files
Thread module: The Thread Module

funny characters: Tied Variables

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