Symbols | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z

Index: S

-S file test operator: 3.10. Named Unary and File Test Operators

s for whitespace=\s (for whitespace): 1.7. Regular Expressions

s operator (see substitution operator)

/s pattern modifier: 5.2.1. Pattern Modifiers

5.2.2. The m// Operator (Matching)

5.2.3. The s/// Operator (Substitution)

5.2.4. The tr/// Operator (Transliteration)

-S (search for script) command-line switch: 19.1.3. Switches

s// (substitution) operator: 24.1.1. Universal Blunders

-s (switch) command-line switch: 19.1.3. Switches

20. The Perl Debugger

safe compartments for insecure code: 23.3.1. Safe Compartments

Safe module: 23.3.1. Safe Compartments

32.1.12. Authentication, Security, and Encryption

insecure code, handling with: 23.3.1.2. Restricting operator access

23.3.1. Safe Compartments

save stack: 18.3. Executing Your Code

saving data structures: 9.7. Saving Data Structures

scalar context: 2.7.1. Scalar and List Context

Boolean values and: 2.7.2. Boolean Context

comma operator in: 3.18. Comma Operators

24.1.5. Previous Perl Traps

conditional operator in: 3.16. Conditional Operator

expressions in (see EXPRs)

forcing: 29.2.137. scalar

functions in: 29. Functions

/g pattern modifier, use in: 5.2.2. The m// Operator (Matching)

hash variables, evaluating in: 2.9. Hashes

keys function, calling in: 14.3.1. Hash-Tying Methods

list assignment in: 2.8.1. List Assignment

3.17. Assignment Operators

lvalues in: 4.8.1. Scoped Variable Declarations

m// (match) operator in: 5.2.2. The m// Operator (Matching)

operations behaving differently in: 24.1.2. Frequently Ignored Advice

range (..) operator in: 3.15. Range Operator

recognizing in debugger: 20.1. Using the Debugger

subroutines, calling and evaluating in: 6.2. Semantics

subtypes of: 2.7.1. Scalar and List Context

void context: 2.7.3. Void Context

scalar pseudofunction: 29.2.137. scalar

scalar reverse function: 15.2. Effects of Character Semantics

scalar values: 2.6. Scalar Values

2.6. Scalar Values

here documents: 2.6.6. "Here" Documents

interpolating array values: 2.6.5. Interpolating Array Values

numeric literals: 2.6.1. Numeric Literals

operators fo: 3. Unary and Binary Operators

string literals: 2.6.2. String Literals

v-string literals: 2.6.7. V-String Literals

scalar variables

in angle brackets: 2.11.2. Line Input (Angle) Operator

in double-quote context: 5.2.3. The s/// Operator (Substitution)

scalars: 1.2.1. Variable Syntax

1.2.1.1. Singularities

2.3. Built-in Data Types

2.4. Variables

characters, length of: 29.2.84. length

complex data structures, representing as: 1.2.1.3. Complexities

constants: 10.1. Symbol Tables

10.1. Symbol Tables

(see also constants)

functions for manipulating: 29.1. Perl Functions by Category

hard references as: 8.1. What Is a Reference?

list of (see arrays)

lists, converting to: 1.2.1.3. Complexities

parameter and return lists, subroutines: 6.2. Semantics

pattern-matching operators, applying to: 5.2. Pattern-Matching Operators

Perl, converting to C types: 21.4.4. Evaluating a Perl Statement from C

references: 1.2.1.1. Singularities

SV (scalar value) in C: 21.2. Internal Data Types

truth, evaluating in: 1.6.1. What Is Truth?

tying: 14.1. Tying Scalars

base class definitions, providing: 32.1.14. Convenient Classes

magical counter variables: 14.1.2. Magical Counter Variables

methods for: 14.1.1. Scalar-Tying Methods

preventing unlocalized use of $_ variables: 14.1.3. Magically Banishing $_

unordered set of (see hashes)

scheduling and preemption policies, threads: 17.2. The Thread Model

scopes: 2.5. Names

4.2. Compound Statements

dynamic: 4.8.4. Dynamically Scoped Variables: local

block: 4.8.2. Lexically Scoped Variables: my

blocks: 4.2. Compound Statements

file: 4.8.2. Lexically Scoped Variables: my

lexical scope: 4.8.2. Lexically Scoped Variables: my

loop variable in foreach: 4.4.3. foreach Loops

variables in if statements: 4.3. if and unless Statements

variables in three-part for loops: 4.4.2. for Loops

variables in while loops: 4.4.1. while and until Statements

declarations and: 4.8. Scoped Declarations

functions dealing with: 29.1. Perl Functions by Category

lexically scoped variables: 2.5. Names

my variables: 10. Packages

package declarations: 10. Packages

pattern-matching operations: 5.2. Pattern-Matching Operators

private variables (see lexical variables)

scope modifiers: 4.8.1. Scoped Variable Declarations

scope operators: 4.8.1. Scoped Variable Declarations

scope stack: 18.3. Executing Your Code

signal handling: 16.1. Signals

static (see scopes; lexical)

subroutines: 6.2.3. Scoping Issues

in threads: 17.2.3.1. Queues

variables: 1.2.1. Variable Syntax

strict pragma and: 1.2.1.4. Simplicities

screen appearance of command line: 20.3.3. Debugger Options

scripts

building with -e switch: 19.1.3. Switches

CGI, taint mode and: 23.1. Handling Insecure Data

checking syntax of: 19.1.3. Switches

debugging: 19.1.3. Switches

19.1.3. Switches

(see also debugging)

dumping core files: 19.1.3. Switches

embedding in messages: 19.1.3. Switches

end marker for: 2.6.8. Other Literal Tokens

executing: 29.2.174. system

insecure: 23.3. Handling Insecure Code

interpretation, shells vs. Perl: 24.1.4. Shell Traps

languages, checking for: 5.4.3.3. Unicode block properties

names of (see $0 variable)

pausing: 29.2.156. sleep

Perl

common mistakes of novices: 24.1. Common Goofs for Novices

CPAN directory of: 22. CPAN

idiomatic Perl, using: 24.4. Fluent Perl

performance of: 24.2. Efficiency

perl interpreter, associating with: 1.3.1. How to Do It

programming with style: 24.3. Programming with Style

searching for and compiling: 19.1. Command Processing

test scripts: 32.1.18. Development Support

running time of: 3.10. Named Unary and File Test Operators

searching for: 19.1.3. Switches

terminating with exec: 29.2.33. exec

SDBM_File module: 32.1.10. DBM Interfaces

search and replace, global: 5.2.3. The s/// Operator (Substitution)

search path, %INC: 28.2. Special Variables in Alphabetical Order

search programs: 1.7. Regular Expressions

Search::Dict module: 32.1.2. String Processing, Language Text Processing, Parsing, and Searching

searching

grep function for: 29.2.72. grep

linear, versus hashes: 24.2.1. Time Efficiency

rules for name searches: 2.5.1. Name Lookups

for scripts: 19.1.3. Switches

for substrings: 5.2.3. The s/// Operator (Substitution)

29.2.75. index

29.2.134. rindex

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

security: 0.1. The Pursuit of Happiness

23. Security

29.2.164. srand

code masquerading as data: 23.3.2. Code Masquerading as Data

insecure code, handling: 23.3. Handling Insecure Code

safe compartments for: 23.3.1. Safe Compartments

insecure data, handling: 23.1. Handling Insecure Data

23.1. Handling Insecure Data

command and file access under reduced privileges: 23.1.3. Accessing Commands and Files Under Reduced Privileges

detecting and laundering tainted data: 23.1.1. Detecting and Laundering Tainted Data

environment, cleaning up: 23.1.2. Cleaning Up Your Environment

modules for: 32.1.12. Authentication, Security, and Encryption

22.1. The CPAN modules Directory

timing glitches, handling: 23.2. Handling Timing Glitches

race conditions: 23.2.2. Handling Race Conditions

temporary files: 23.2.3. Temporary Files

Unix kernel security bugs: 23.2.1. Unix Kernel Security Bugs

Win32::FileSecurity module: 32.1.20. Microsoft-Related Modules

security, of file test operators: 31.10. use filetest

sed: 1.7. Regular Expressions

5.2.4. The tr/// Operator (Transliteration)

seed, random number: 29.2.164. srand

seek function: 29.2.138. seek

29.2.176. tell

(see also tell function)

SEEK method: 14.4.1. Filehandle-Tying Methods

seekable I/O objects: 32.1.5. Filehandle, Directory Handle, and Stream I/O Utilities

seekdir function: 29.2.139. seekdir

select function: 29.2.38. fileno

29.2.113. print

29.2.140. select (output filehandle)

29.2.141. select (ready file descriptors)

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

for format variables: 7.1. Format Variables

7.1. Format Variables

select syscall, multiplexing I/O between clients: 16.5.2. Networking Servers

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

self-matching characters: 5.9.4. The Little Engine That /Could(n't)?/

self method, thread accessing own thread object: 17.2.1.5. Identifying threads

SelfLoader module: 10.2. Autoloading

32.1.17. Module Installation Support

Devel::SelfStubber module, using with: 32.1.17. Module Installation Support

semantics: 29.2.192. use

semaphore file, use in file locking: 16.2.1. File Locking

System V IPC: 16.4. System V IPC

functions for: 29.2.142. semctl

IPC::Semaphore module: 32.1.8. Networking and Interprocess Communication

shared memory: 16.4. System V IPC

thread safety and: 17.2. The Thread Model

Thread::Semaphore module: 17.2.3.2. Semaphores

Win32::Semaphore module: 32.1.20. Microsoft-Related Modules

semctl function: 29.2.142. semctl

semget function: 29.2.143. semget

semop function: 29.2.144. semop

send function: 29.2.145. send

separators, split operator, defining: 1.7. Regular Expressions

sequential matches: 5.9.4. The Little Engine That /Could(n't)?/

serial ports, Perl modules for: 22.1. The CPAN modules Directory

serializing Perl data structures: 32.1.13. Perl Language Extensions and Internals

server-push CGI scripting: 32.1.9. World Wide Web

servers

forking clones to handle incoming connections: 16.5.2. Networking Servers

networking: 16.5.2. Networking Servers

Perl modules for: 22.1. The CPAN modules Directory

taint mode, importance of enabling for: 23.1. Handling Insecure Data

TCP: 16.5.1. Networking Clients

service port name/number translations: 29.2.64. getservbyname

set-id program:

23.1. Handling Insecure Data

dangerous operations, UID and GID setting to real: 23.1.3. Accessing Commands and Files Under Reduced Privileges

Unix kernel bugs, security problems with: 23.2.1. Unix Kernel Security Bugs

setgid function: 16.3.2. Talking to Yourself

23.1. Handling Insecure Data

setgrent function: 29.2.44. getgrent

sethostent function: 29.2.49. gethostent

setpgrp function: 29.2.146. setpgrp

16.1.1. Signaling Process Groups

setpriority function: 29.2.147. setpriority

setprotoent function: 29.2.60. getprotoent

setpwent function: 29.2.61. getpwent

sets, intersection: 6.3. Passing References

setservent function: 29.2.66. getservent

setsockopt function: 29.2.148. setsockopt

setuid function: 16.3.2. Talking to Yourself

23.1. Handling Insecure Data

shadow, password entries: 29.2.62. getpwnam

shared file locks: 16.2.1. File Locking

shared memory, System V IPC: 16.4. System V IPC

controlled access to: 16.4. System V IPC

functions for: 29.2.150. shmctl

# (sharp)

for comments: 2.2. Molecules

/x pattern modifier, using with: 5.2.1. Pattern Modifiers

in formats: 7. Formats

quoting character, whitespace and: 2.6.3. Pick Your Own Quotes

#! (shebang) notation: 1.3.1. How to Do It

19.1. Command Processing

security problems caused by: 23.2.1. Unix Kernel Security Bugs

simulating on non-Unix systems: 19.1.1. #! and Quoting on Non-Unix Systems

shell module: 32.1.7. Operating System Interfaces

alternative for Perl, Windows systems: 19.2. Environment Variables

avoiding use of: 23.1.3. Accessing Commands and Files Under Reduced Privileges

avoiding with multi-argument piped open: 16.3.1. Anonymous Pipes

Bourne shell (sh): 19.1. Command Processing

bypassing with -| piping pseudocommand: 16.3.2. Talking to Yourself

debugger commands and: 20.2.6. Actions and Command Execution

environment variables as security hazards: 23.1.2. Cleaning Up Your Environment

environment variables, using with: 19.2. Environment Variables

I/O streams, setting up: 1.4. Filehandles

pipe commands with shell metacharacters, passing to: 29.2.104. open

pipe commands with special characters, handling: 16.3.1. Anonymous Pipes

programming, Perl vs.: 24.1.4. Shell Traps

quotes, passing through: 19.1.3. Switches

security pitfalls with use, avoiding: 23.3.2. Code Masquerading as Data

spawning, characters for: 20.3.3. Debugger Options

shift function: 9. Data Structures

29.2.149. shift

shift operator: 1.6.2.1. The while and until statements

3.9. Shift Operators

3.9. Shift Operators

shmctl function: 29.2.150. shmctl

ShMem package: 16.4. System V IPC

shmget function: 29.2.151. shmget

shmread function: 29.2.152. shmread

shmwrite function: 29.2.153. shmwrite

short-circuit operators: 1.5.5. Logical Operators

3.14. C-Style Logical (Short-Circuit) Operators

overloading and: 13.3. Overloadable Operators

shortening arrays: 2.8.2. Array Length

shorts: 29.2.162. sprintf

shutdown function: 29.2.154. shutdown

shutdown syscall: 16.5.1. Networking Clients

%SIG hash: 16.1. Signals

28.2. Special Variables in Alphabetical Order

sigaction function: 16.1.2. Reaping Zombies

SIGALRM signal: 29.2.3. alarm

signal handlers

defining as strings: 10. Packages

%SIG, Perl vs. C language: 24.1.3. C Traps

signal handling, sigtrap module: 32.1.7. Operating System Interfaces

signal level option (debugger): 20.3.3. Debugger Options

signals: 16. Interprocess Communication

16.1. Signals

%SIG hash: 28.2. Special Variables in Alphabetical Order

blocking: 16.1.4. Blocking Signals

core dumps, triggering in C library: 16.1. Signals

killing processes with: 29.2.80. kill

portability of: 25.4. System Interaction

signaling process groups: 16.1.1. Signaling Process Groups

sources of: 16.1. Signals

threads, delivering to: 17.2. The Thread Model

Thread::Signal module: 17.2.3.3. Other standard threading modules

timing out slow operations: 16.1.3. Timing Out Slow Operations

trapping with sigtrap pragma: 16.1. Signals

zombie processes, reaping: 16.1.2. Reaping Zombies

sigprocmask syscall: 16.1.4. Blocking Signals

sigtrap pragma: 16.1. Signals

16.1. Signals

sin function (sine): 29.2.155. sin

single inheritance: 12.5. Class Inheritance

single quotes (')

contractions in words, avoiding confusion with: 5.10.1. Lookaround Assertions

as package delimiters: 10. Packages

pattern recompilation and: 5.2.1. Pattern Modifiers

suppressing interpolation: 1.2.1.1. Singularities

suppressing variable interpolation and translation escape processing: 5.9.2.1. When backslashes happen

singularities (see singularities)

$size file statistic: 29.2.165. stat

sleep function: 29.2.156. sleep

select function instead of: 29.2.141. select (ready file descriptors)

slices of arrays or hashes: 2.4. Variables

slices of multidimensional arrays: 9.1.4. Slices

Perl, setting value for: 19.1.3. Switches

Socket module: 16.5. Sockets

32.1.8. Networking and Interprocess Communication

inet_ntoa function: 29.2.47. gethostbyaddr

networking client, connecting to server: 16.5.1. Networking Clients

socketpair function: 29.2.158. socketpair

socketpair syscall: 16.3.3. Bidirectional Communication

sockets

accepting connections from clients: 29.2.2. accept

attaching address to: 29.2.5. bind

closing: 29.2.16. close

closing one side: 29.2.154. shutdown

connecting: 29.2.18. connect

functions for: 29.2.67. getsockname

functions (Perl), dealing with: 16.5. Sockets

getting packed sockaddr address: 29.2.54. getpeername

in interprocess communication: 16.5. Sockets

message passing: 16.5.3. Message Passing

networking clients: 16.5.1. Networking Clients

networking servers: 16.5.2. Networking Servers

listen function for: 29.2.86. listen

low-level access, functions for: 29.1. Perl Functions by Category

modules for: 32.1.8. Networking and Interprocess Communication

newlines, sending across: 25.1. Newlines

opening with socket function: 29.2.157. socket

protocols and: 16. Interprocess Communication

receiving messages on: 29.2.125. recv

sending messages on: 29.2.145. send

setting options: 29.2.148. setsockopt

shutting down connection: 29.2.154. shutdown

TCP and: 16.5. Sockets

Unix-domain sockets: 16.5. Sockets

sort variables: 28.2. Special Variables in Alphabetical Order

sort function: 1.8. List Processing

sort subroutines, comparison operators in: 1.5.6. Some Numeric and String Comparison Operators

sorting

arrays in hashes of: 9.2.3. Access and Printing of a Hash of Arrays

hashes: 9.4.3. Access and Printing of a Hash of Hashes

keys and values, hashes: 29.2.79. keys

lists: 29.2.159. sort

overloading and: 13.3. Overloadable Operators

sort function: 29.2.159. sort

sort( ), keys, lists of: 1.2.1.2.2. Hashes.

source code

CPAN, for Perl distribution: 22. CPAN

development tools for: 18.6. Code Development Tools

filter for: 18.5.1. The Bytecode Generator

filters for: 24.5.3. Source Filters

foreign code, executing: 23. Security

window around breakpoint, examining: 20.1. Using the Debugger

source filters: 22.1. The CPAN modules Directory

space: 2.2. Molecules

spaceship operator (<=>): 3.12. Equality Operators

special characters: 5.9.4. The Little Engine That /Could(n't)?/

special variables: 28.1.6. Per-Package Special Functions

speed (see also performance)

24.2. Efficiency

splice function: 29.2.160. splice

Perl versions, changes in: 24.1.5. Previous Perl Traps

splicing tied arrays: 14.2.1. Array-Tying Methods

split function: 1.7. Regular Expressions

5.2. Pattern-Matching Operators

5.7.2. Clustering

24.2.1. Time Efficiency

29.2.161. split

sprintf function: 14.4.1. Filehandle-Tying Methods

29.2.162. sprintf

sqrt function (square root): 29.2.163. sqrt

srand function: 29.2.164. srand

src directory (CPAN): 22. CPAN

stacks: 1.2.1.2.1. Arrays.

9. Data Structures

expression evaluation: 2.3. Built-in Data Types

backtracing with T command: 20.1. Using the Debugger

disciplines: 29.2.104. open

Perl, manipulating from C: 21.4.5. Fiddling with the Perl Stack from C

Perl virtuall machine: 18.3. Executing Your Code

subroutines, current calls: 29.2.8. caller

standard input, scripts, passing by: 19.1. Command Processing

standard Unicode properties: 5.4.3.2. Standard Unicode properties

star (see asterisk)

starting position of matched string: 28.2. Special Variables in Alphabetical Order

stat, file permissions as octal: 29.2.103. oct

stat function: 29.2.165. stat

32.1.4. Filenames, Filesystems, and File Locking

filehandles, calling on: 23.2.2. Handling Race Conditions

state

common, sharing by class objects: 12.8. Managing Class Data

inheritance with class data accessor methods: 12.8. Managing Class Data

statements: 4. Statements and Declarations

compound: 4.2. Compound Statements

global declarations and: 4.7. Global Declarations

if and unless: 4.3. if and unless Statements

labels for (see labels)

loop-control operators vs.: 4.4.4. Loop Control

loops (see loops)

Perl, evaluating from C: 21.4.4. Evaluating a Perl Statement from C

simple: 4.1. Simple Statements

static linking: 21.3.1. XS and XSUBs

static scoping (see lexical scope)

static variables: 6.2.3. Scoping Issues

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

status of exiting process: 28.2. Special Variables in Alphabetical Order

STDERR filehandle: 24.3. Programming with Style

28.2. Special Variables in Alphabetical Order

29.2.38. fileno

STDIN filehandle: 28.2. Special Variables in Alphabetical Order

STDIN: 1.4. Filehandles

29.2.38. fileno

reading single characters from: 29.2.43. getc

STDIN, STDOUT, and STDERR filehandles: 16.2.2. Passing Filehandles

passing filehandles to new programs through: 16.2.2. Passing Filehandles

reassigning to client connection: 16.5.2. Networking Servers

STDOUT filehandle: 28.2. Special Variables in Alphabetical Order

STDOUT: 1.4. Filehandles

29.2.38. fileno

printing to: 29.2.113. print

stemming text, Perl modules for: 22.1. The CPAN modules Directory

stepping through code: 20.2.1. Stepping and Running

sticky bit: 24.2.1. Time Efficiency

stopping (see terminating)

infinite loop: 4.4.2. for Loops

storage locations

for bytes (see big endian; little endian)

lvalues for: 1.5.3. Assignment Operators

(see also lvalues)

storing complex data values in DBM file: 14.6. Tie Modules on CPAN

strict module: 1.2.1.4. Simplicities

32.1.13. Perl Language Extensions and Internals

strict pragma: 2.5.1. Name Lookups

4.9.2. Controlling the Use of Globals

8.4. Symbolic References

string context: 2.7.1. Scalar and List Context

string literals: 2.6.2. String Literals

newlines in: 2.6.2. String Literals

v-strings (vector or version): 2.6.7. V-String Literals

stringification: 13.3. Overloadable Operators

modules for: 32.10. Data::Dumper

stringifying

data structures: 9.7. Saving Data Structures

objects: 8.3.6. Other Tricks You Can Do with Hard References

references: 8.3.6. Other Tricks You Can Do with Hard References

8.5.1. References Don't Work as Hash Keys

9.1.3. Access and Printing

9.1.5. Common Mistakes

stringifying operator

overloading: 14.4.1. Filehandle-Tying Methods

strings: 1.2.1. Variable Syntax

binary (see binary numbers)

bitwise operators, working with: 3.13. Bitwise Operators

boundary assertions: 1.7.3. Nailing Things Down

5.6.1. Beginnings: The \A and ^ Assertions

capitalization of (see capitalization)

comparing: 3.11. Relational Operators

comparison operators: 1.5.6. Some Numeric and String Comparison Operators

as compilation units: 2.5.1. Name Lookups

concatenating: 3.8. Additive Operators

24.2.1. Time Efficiency

containing newlines, matches against: 5.2.1. Pattern Modifiers

converting to list values: 29.2.189. unpack

converting to numbers:of: 2.6.1. Numeric Literals

display, changing in debugger: 20.3.3. Debugger Options

double-quoted

changes in Perl versions: 24.1.5. Previous Perl Traps

character interpolation in: 2.6.2. String Literals

eval function and: 24.2.1. Time Efficiency

extracting substrings: 29.2.168. substr

first character of: 28.2. Special Variables in Alphabetical Order

formats for: 29.2.162. sprintf

hexadecimal (see hexadecimal numbers)

index function: 29.2.75. index

joining: 29.2.78. join

list values, converting to: 29.2.108. pack

modifying: 5.2.3.1. Modifying strings en passant

numbers, converting to: 2.6. Scalar Values

octal (see octal numbers)

operators: 1.5.2. String Operators

24.1.1. Universal Blunders

printing: 29.2.113. print

printing values in: 8.3.6. Other Tricks You Can Do with Hard References

quoted: 1.2.1.1. Singularities

range operator, working with: 3.15. Range Operator

references and: 8.5.1. References Don't Work as Hash Keys

rindex function: 29.2.134. rindex

searching for and replacing substrings (s/// operator): 5.2.3. The s/// Operator (Substitution)

splitting into substrings: 29.2.161. split

study function and: 29.2.166. study

truth values of: 1.6.1. What Is Truth?

vec function and: 29.2.195. vec

stripping (see deleting characters)

Struct::Class module: 12.7. Managing Instance Data

structs

emulating: 12.7.2. Generating Classes with Class::Struct

formatting: 29.2.108. pack

structural metacharacters in regular expressions: 5.1. The Regular Expression Bestiary

structural metasymbols: 5.3.1. Metasymbol Tables

StrVal (overload::StrVal): 13.7. Public Overload Functions

stubs for modules, generating: 32.1.17. Module Installation Support

study function: 29.2.166. study

style, programming with: 24.3. Programming with Style

sub {}: 4.5. Bare Blocks

sub declaration: 8.2.2.3. The anonymous subroutine composer

29.2.167. sub

sub keyword: 6.1. Syntax

6.4. Prototypes

subarrays and subhashes, references to, in arrays: 1.2.1.2.1. Arrays.

subclasses: 12.1. Brief Refresher on Object-Oriented Lingo

attributes, overriding superclass ancestors: 12.7. Managing Instance Data

subnamespaces, for variables: 2.5. Names

subroutine call stack: 29.2.8. caller

subroutine calls, executing without stepping through: 20.2.1. Stepping and Running

subroutines: 1.2.1. Variable Syntax

6. Subroutines

6. Subroutines

12.2. Perl's Object System

arguments: 28.2. Special Variables in Alphabetical Order

aborting with exit: 29.2.35. exit

anonymous references to: 8.2.2.3. The anonymous subroutine composer

atrributes, getting and setting: 32.1.13. Perl Language Extensions and Internals

autoloading: 10.2. Autoloading

12.5.4. Method Autoloading

32.1.17. Module Installation Support

barewords, confusing with: 24.1.5. Previous Perl Traps

B::Xref module, cross-references with C: 18.6. Code Development Tools

calling indirectly: 6.1. Syntax

calling, method invocations vs.: 12.4.1. Inheritable Constructors

classes with same names: 12.3.4. Package-Quoted Classes

constant: 10.1. Symbol Tables

data, passing into and out of: 6.2. Semantics

debugger command for pattern match listings: 20.2.5. Locating Code

declaring: 4.7. Global Declarations

29.2.167. sub

declaring in package for AUTOLOAD management: 12.5.4. Method Autoloading

defining: 6.2. Semantics

definitions, loading from other files: 4.7. Global Declarations

do SUBROUTINE operator: 29.2.28. do (subroutine)

errors, indicating: 6.2.2. Error Indications

external, portability of: 25.6. External Subroutines (XS)

external (XSUBs): 21.3. Extending Perl (Using C from Perl)

importing from another module: 6.1. Syntax

lexically scoped: 29.2.99. my

locking for threads: 17.2.2.3. Locking subroutines

locked attribute: 17.2.2.4. The locked attribute

lvalue attribute: 12.7.6. New Tricks

method resolution, steps for: 12.5. Class Inheritance

methods vs.: 12.3. Method Invocation

named, compiler/interpreter interaction: 18.7. Avant-Garde Compiler, Retro Interpreter

names for: 2.5. Names

2.5. Names

names of: 6.1. Syntax

nested: 8.3.7.2. Nested subroutines

parameter lists, working with: 6.2.1. Tricks with Parameter Lists

passing references in: 6.3. Passing References

performance and: 24.2.1. Time Efficiency

Perl, calling from C: 21.4.3. Calling a Perl Subroutine from C

prototyping, careful use of: 6.4.2. Care with Prototypes

redefining, inlining and: 6.4.1. Inlining Constant Functions

references to, retrieving from or passing to: 10.1. Symbol Tables

references to, in scalars: 1.2.1.1. Singularities

return function: 29.2.131. return

return values: 6.2. Semantics

returning references: 8.2.3. Object Constructors

scoping issues: 6.2.3. Scoping Issues

sorting, reverse disallowed as name for: 24.1.5. Previous Perl Traps

substituting with goto: 4.6. goto

29.2.71. goto

timelocal: 29.2.88. localtime

user-defined: 1.2.2. Verbs

subs module: 32.1.13. Perl Language Extensions and Internals

subs pragma, overriding built-in functions with: 11.3. Overriding Built-in Functions

$SUBSCRIPT_SEPARATOR: 2.9. Hashes

28.2. Special Variables in Alphabetical Order

subscripting: 24.2.1. Time Efficiency

negative: 2.3. Built-in Data Types

subscripts, arrays: 1.2.1.2.1. Arrays.

subshells, environment variables, using with: 19.2. Environment Variables

substitute (s//) operator: 24.1.1. Universal Blunders

5. Pattern Matching

2.7.4. Interpolative Context

5.2. Pattern-Matching Operators

substitution evaluations: 5.10.3.2. Substitution evaluations

substitution, shells versus Perl: 24.1.4. Shell Traps

substr function: 24.2.1. Time Efficiency

29.2.168. substr

chop function and: 29.2.12. chop

manipulating string positions with: 5.6. Positions

searching for and replacing with s/// operator: 5.2.3. The s/// Operator (Substitution)

subtracting, from character sets: 5.4.3.4. Defining your own character properties

subtracting pattern modifiers from cloisters: 5.7.3. Cloistered Pattern Modifiers

subtraction (see also additive operators)

overloaded objects: 13.2. Overload Handlers

SUPER pseudoclass: 12.5.2. Accessing Overridden Methods

12.5.2. Accessing Overridden Methods

superclasses: 12.1. Brief Refresher on Object-Oriented Lingo

SV (internal scalar value): 21.2. Internal Data Types

SWIG: 21.3.1. XS and XSUBs

SWIG system, XSUBs, automatically generating: 21.3.1. XS and XSUBs

switch statement: 4.5.1. Case Structures

24.2.1. Time Efficiency

Perl vs. C programming: 24.1.3. C Traps

switches, command-line: 19.1. Command Processing

19.1.3. Switches

-e switches: 19.1. Command Processing

default, taking switches as: 19.2. Environment Variables

single character, processing with clustering: 32.1.3. Option, Argument, Parameter, and Configuration File Processing

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

symbol tables: 2.5. Names

2.5. Names

10.1. Symbol Tables

containing references to other symbol tables: 10.1. Symbol Tables

current package, determining use of: 10. Packages

displaying for packages: 20.3.3. Debugger Options

entries, aliasing: 2.10. Typeglobs and Filehandles

format name identifiers in: 29.2.41. format

in fully qualified names: 2.5. Names

local operator, making temporary changes with: 4.8.4. Dynamically Scoped Variables: local

packages: 29.2.109. package

references to: 8.2.5. Symbol Table References

Symbol module: 32.1.1. Data Types

symbolic references naming entries in: 8.1. What Is a Reference?

(see also debugging)

symbolic dereferences, checking with strict pragma: 4.9.2. Controlling the Use of Globals

symbolic links: 29.2.169. symlink

getting filenames from: 29.2.123. readlink

lstat function and: 29.2.91. lstat

security risks in Unix: 23.2.1. Unix Kernel Security Bugs

symbolic references: 8.1. What Is a Reference?

8.4. Symbolic References

symbols

exporting, prevention of 11.2.1.3. Managing unknown symbols

exporting from modules: 11.2. Creating Modules

importing into current package: 11.1. Using Modules

leaving off export list or deleting from import list: 11.2.1. Module Privacy and the Exporter

metasymbols, generic wildcards: 5.3.3. Wildcard Metasymbols

symlink function: 29.2.169. symlink

data access in threads: 17.2.2.1. Synchronizing access with lock

syntax, checking: 19.1.3. Switches

syntax, Perl: 2.3. Built-in Data Types

syscall function: 29.2.3. alarm

29.2.170. syscall

ioctl and fcntl returns: 29.2.77. ioctl

performance and: 24.2.1. Time Efficiency

Perl, C language vs.: 24.1.3. C Traps

restarting: 16.1.3. Timing Out Slow Operations

signal interruption of: 16.1.2. Reaping Zombies

Sys::Hostname module: 32.1.7. Operating System Interfaces

syslog, filehandle tying to: 14.6. Tie Modules on CPAN

sysopen function: 16.2.1. File Locking

16.3.4. Named Pipes

29.2.104. open

29.2.171. sysopen

file overwriting, controlling: 23.2.2. Handling Race Conditions

sysread function: 14.4.1. Filehandle-Tying Methods

29.2.172. sysread

Sys::Syslog module: 32.1.7. Operating System Interfaces

system calls: 29.2.170. syscall

system function: 29.2.174. system

list argument form, avoiding shell with: 23.3.2. Code Masquerading as Data

performance and: 24.2.1. Time Efficiency

portability of: 25.5. Interprocess Communication (IPC)

System V IPC: 16.4. System V IPC

functions dealing with: 29.1. Perl Functions by Category

functions for semaphores: 29.2.142. semctl

IPC::SysV module: 32.1.8. Networking and Interprocess Communication

killing proces groups: 29.2.80. kill

messages, syscalls for: 29.2.95. msgctl

portability of: 25.5. Interprocess Communication (IPC)

shared memory, functions for: 29.2.150. shmctl

System V IPC syscalls: 16. Interprocess Communication

reliable signals, not supporting: 16.1.2. Reaping Zombies

$SYSTEM_FD_MAX: 28.2. Special Variables in Alphabetical Order

syswrite function: 14.4. Tying Filehandles

14.4.1. Filehandle-Tying Methods

29.2.175. syswrite

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