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Index: S

/s pattern-matching modifier : 6.0. Introduction

matching multiple lines : 6.6. Matching Multiple Lines

\s substitution modifier : 1.11. Indenting Here Documents

s/// operator

~ operator with : 1.1. Accessing Substrings
stripping whitespace with : 1.11. Indenting Here Documents

sascii program (example) : 15.6. Reading from the Keyboard

save_parameters( ) : 19.13. Saving a Form to a File or Mail Pipe

scalars : 1.0. Introduction

arrays of scalar references : 11.6. Creating Arrays of Scalar References
detecting scalar context : 10.6. Detecting Return Context
exchanging values between : 1.3. Exchanging Values Without Using Temporary Variables
references to : 11.5. Taking References to Scalars

schemes (URLs) : 19.0. Introduction

Schwartz, Randal : 4.15. Sorting a List by Computable Field

scope of subroutine variables : 10.2. Making Variables Private to a Function

screen : (see user interfaces)

scripts, CGI : (see CGI programming)

SDBM library : 14.0. Introduction

searching for patterns : (see pattern matching; regular expressions)

seconds : (see date and time)

security

CGI scripts

19.0. Introduction
19.4. Writing a Safe CGI Program
executing user commands : 19.6. Executing Commands Without Shell Escapes

connecting through firewalls : 17.18. Program: fwdport

reading passwords without echo : 15.10. Reading Passwords

testing files for trustworthiness : 8.17. Testing a File for Trustworthiness

seek( )

8.0. Introduction
8.5. Trailing a Growing File

seekdir( ) : 9.5. Processing All Files in a Directory

seeme program (example) : 7.12. Flushing Output

select( )

3.10. Short Sleeps

17.3. Communicating over TCP

changing STDOUT : 7.0. Introduction

reading from multiple filehandles

7.13. Reading from Many Filehandles Without Blocking
17.3. Communicating over TCP

self-referential data structures : 13.13. Coping with Circular Data Structures

SelfLoader module : 12.9. Speeding Module Loading with SelfLoader

separators, menu : 15.14. Creating Menus with Tk

servers

daemon servers : 17.15. Making a Daemon Server
forking : 17.11. Forking Servers
multi-homed : 17.14. Writing a Multi-Homed Server
non-forking : 17.13. Non-Forking Servers
POP3 : 18.5. Reading Mail with POP3
pre-forking : 17.12. Pre-Forking Servers
restarting on demand : 17.16. Restarting a Server on Demand
TCP : 17.2. Writing a TCP Server
UDP : 17.5. Setting Up a UDP Server

set theory : 4.7. Finding Elements in One Array but Not Another

setsockopt( ) : 17.13. Non-Forking Servers

setting up : (see initializing)

shallow copies : 11.12. Copying Data Structures

shared locks : 7.11. Locking a File

sharetest program (example) : 16.12. Sharing Variables in Different Processes

sharing variables among processes : 16.12. Sharing Variables in Different Processes

shell escapes, executing commands without : 19.6. Executing Commands Without Shell Escapes

shell wildcards for regexp matching : 6.9. Matching Shell Globs as Regular Expressions

shift( )

circular lists : 4.16. Implementing a Circular List
on multiple array elements : 4.11. Processing Multiple Elements of an Array
Tie::IxHash module and : 5.6. Retrieving from a Hash in Insertion Order

shopping cart : 19.12. Writing a Multiscreen CGI Script

shuffling

(see also random)
8.7. Randomizing All Lines
array elements : 4.17. Randomizing an Array
file line order : 8.7. Randomizing All Lines

shutdown( ) : 17.9. Closing a Socket After Forking

%SIG hash : 16.15. Installing a Signal Handler

SIGALRM signal

16.0. Introduction
16.21. Timing Out an Operation

SIGCHLD signal

16.0. Introduction
16.19. Avoiding Zombie Processes

SIGHUP signal

16.0. Introduction
17.16. Restarting a Server on Demand

SIGINT signal

16.0. Introduction
16.18. Catching Ctrl-C

signals : 16.0. Introduction

blocking : 16.20. Blocking Signals

handlers for : 16.15. Installing a Signal Handler

listing available : 16.13. Listing Available Signals

process groups

7.22. Program: lockarea
16.14. Sending a Signal

sending : 16.14. Sending a Signal

signatures, randomized : 16.22. Program: sigrand

SIGPIPE signal

16.0. Introduction
16.4. Reading or Writing to Another Program

sigprocmask system call : 16.20. Blocking Signals

SIGQUIT signal : 16.0. Introduction

sigrand program (example) : 16.22. Program: sigrand

SIGTERM signal : 16.0. Introduction

SIGUSR1, SIGUSR2 signals : 16.0. Introduction

sin( ) : 2.12. Calculating More Trigonometric Functions

single inheritance : 13.0. Introduction

single quotes (') : 1.0. Introduction

q( ) : 4.1. Specifying a List In Your Program

size

arrays, changing : 4.3. Changing Array Size
hashes, preallocating for : 5.13. Presizing a Hash
Tk window resize events : 15.16. Responding to Tk Resize Events
window/terminal, determining : 15.4. Determining Terminal or Window Size

sleeps : 3.10. Short Sleeps

slowcat program (example) : 1.5. Processing a String One Character at a Time

SOCK_ constants : 17.0. Introduction

sockaddr_in( )

17.0. Introduction
17.4. Setting Up a UDP Client

sockaddr_un( ) : 17.0. Introduction

socket( ) : 17.0. Introduction

sockets : 17.0. Introduction

bidirectional clients : 17.10. Writing Bidirectional Clients

closing after forking : 17.9. Closing a Socket After Forking

connecting through firewalls : 17.18. Program: fwdport

daemon servers : 17.15. Making a Daemon Server

finding own name/address : 17.8. Finding Your Own Name and Address

forking servers : 17.11. Forking Servers

identifying machine at end : 17.7. Identifying the Other End of a Socket

logging port connection attempts : 17.17. Program: backsniff

multi-homed servers : 17.14. Writing a Multi-Homed Server

non-blocking : 17.2. Writing a TCP Server

non-forking servers : 17.13. Non-Forking Servers

pre-forking servers : 17.12. Pre-Forking Servers

restarting servers on demand : 17.16. Restarting a Server on Demand

TCP protocol

communicating over : 17.3. Communicating over TCP
writing clients : 17.1. Writing a TCP Client
writing servers : 17.2. Writing a TCP Server

UDP protocol

writing clients : 17.4. Setting Up a UDP Client
writing servers : 17.5. Setting Up a UDP Server

Unix domain

17.0. Introduction
17.6. Using UNIX Domain Sockets

soft links : (see symbolic links)

sort( )

4.14. Sorting an Array Numerically
5.9. Sorting a Hash

sortdemo program (example) : 14.6. Sorting Large DBM Files

sorting

array elements : 4.14. Sorting an Array Numerically

DBM files : 14.6. Sorting Large DBM Files

directory contents

9.0. Introduction
9.12. Program: lst

du command output : 5.16. Program: dutree

hash elements : 5.9. Sorting a Hash

mail (example subroutine) : 10.17. Program: Sorting Your Mail

pod =head1 sections : 15.19. Program: tkshufflepod

randomizing array element order : 4.17. Randomizing an Array

randomizing file line order : 8.7. Randomizing All Lines

text into columns : 4.18. Program: words

Soundex matching : 1.16. Soundex Matching

spaces : (see whitespace)

specific classes : 13.0. Introduction

spider (robot) : 20.11. Creating a Robot

splice( ) : 4.11. Processing Multiple Elements of an Array

Tie::IxHash module and : 5.6. Retrieving from a Hash in Insertion Order

split( )

1.5. Processing a String One Character at a Time
8.3. Processing Every Word in a File
8.9. Processing Variable-Length Text Fields
reading records with pattern separators : 6.7. Reading Records with a Pattern Separator

sprintf( )

%c format : 1.4. Converting Between ASCII Characters and Values
comparing floating-point numbers : 2.2. Comparing Floating-Point Numbers
rounding floating-point numbers : 2.3. Rounding Floating-Point Numbers

SQL database : 20.9. Creating HTML Templates

SQL queries

14.10. Executing an SQL Command Using DBI and DBD
19.7. Formatting Lists and Tables with HTML Shortcuts

srand( ) : 2.8. Generating Different Random Numbers

stale hyperlinks, finding : 20.7. Finding Stale Links

standard filehandles : 7.0. Introduction

stat( )

8.17. Testing a File for Trustworthiness
9.0. Introduction
9.1. Getting and Setting Timestamps

static data members

13.0. Introduction
13.4. Managing Class Data

static scoping : 10.13. Saving Global Values

STDERR filehandle : 7.0. Introduction

controlling for other programs : 16.9. Controlling the Input, Output, and Error of Another Program
reading from programs : 16.7. Reading STDERR from a Program

STDIN filehandle : 7.0. Introduction

preprocessing input : 16.6. Preprocessing Input
testing for interactivity : 15.2. Testing Whether a Program Is Running Interactively

stdio library : 7.0. Introduction

STDOUT filehandle : 7.0. Introduction

filtering output : 16.5. Filtering Your Own Output
testing for interactivity : 15.2. Testing Whether a Program Is Running Interactively

sticky widgets : 19.11. Creating Sticky Widgets

stingy matching : (see non-greedy pattern matching)

Storable module : 11.12. Copying Data Structures

STORE( ) : 13.15. Creating Magic Variables with tie

store( ) (Storable module) : 11.13. Storing Data Structures to Disk

stream sockets

17.0. Introduction
17.11. Forking Servers

strftime( ) : 3.8. Printing a Date

String::Approx module : 6.13. Approximate Matching

strings

(see also variables)
1.0. Introduction
1.8. Expanding Variables in User Input
accessing substrings : 1.1. Accessing Substrings
checking if valid numbers : 2.1. Checking Whether a String Is a Valid Number
converting ASCII and values : 1.4. Converting Between ASCII Characters and Values
converting ASCII to/from HTML : 20.4. Converting ASCII to HTML
converting case : 1.9. Controlling Case
copying and substituting : 6.1. Copying and Substituting Simultaneously
default values for : 1.2. Establishing a Default Value
duplicate words, finding : 6.16. Detecting Duplicate Words
escaping characters : 1.13. Escaping Characters
hash element indices : 5.0. Introduction
HTML text substitutions : 20.14. Program: htmlsub
interpolating functions/expression within : 1.10. Interpolating Functions and Expressions Within Strings
matching letters : 6.2. Matching Letters
matching words : 6.3. Matching Words
numeric operators with : 13.14. Overloading Operators
parsing datetime information in : 3.7. Parsing Dates and Times from Strings
plurals based on numbers : 2.18. Printing Correct Plurals
processing characters individually : 1.5. Processing a String One Character at a Time
psgrep program (example) : 1.18. Program: psgrep
reading from binary files : 8.14. Reading a String from a Binary File
reformatting paragraphs : 1.12. Reformatting Paragraphs
removing leading/trailing spaces : 1.14. Trimming Blanks from the Ends of a String
removing/extracting HTML tags : 20.6. Extracting or Removing HTML Tags
reversing elements of : 1.6. Reversing a String by Word or Character
substituting specific words : 1.17. Program: fixstyle
text color, changing : 15.5. Changing Text Color

strings program (example) : 8.14. Reading a String from a Binary File

stripping whitespace : 1.14. Trimming Blanks from the Ends of a String

StrNum class (example) : 13.14. Overloading Operators

struct( ) (Class::Struct) : 13.5. Using Classes as Structs

struct_flock( ) (lockarea) : 7.22. Program: lockarea

structs, classes as : 13.5. Using Classes as Structs

sub keyword : 10.0. Introduction

subclasses : 13.0. Introduction

determining membership : 13.8. Determining Subclass Membership
inheritance and : 13.12. Solving the Data Inheritance Problem

subject, sorting mail by (example) : 10.17. Program: Sorting Your Mail

submitting HTML forms : 20.2. Automating Form Submission

subroutines : 10.0. Introduction

access arguments of : 10.1. Accessing Subroutine Arguments

built-in, overriding : 12.11. Overriding Built-In Functions

currently running, name of : 10.4. Determining Current Function Name

email sorter (example) : 10.17. Program: Sorting Your Mail

exception handling : 10.12. Handling Exceptions

localizing : 10.14. Redefining a Function

nesting : 10.16. Nesting Subroutines

passing by named parameter : 10.7. Passing by Named Parameter

passing by reference : 10.5. Passing Arrays and Hashes by Reference

private for modules : 12.4. Making Variables Private to a Module

private variables : 10.2. Making Variables Private to a Function

prototypes for functions : 10.11. Prototyping Functions

return context, detecting : 10.6. Detecting Return Context

return values

returning by reference : 10.9. Returning More Than One Array or Hash
returning failure : 10.10. Returning Failure
skipping selected : 10.8. Skipping Selected Return Values

saving global values : 10.13. Saving Global Values

trapping undefined function calls : 10.15. Trapping Undefined Function Calls with AUTOLOAD

substituting within strings : 6.1. Copying and Substituting Simultaneously

substr( ) : 1.1. Accessing Substrings

substrings : 1.1. Accessing Substrings

SUPER class : 13.10. Accessing Overridden Methods

superclasses : 13.0. Introduction

accessing overridden methods : 13.10. Accessing Overridden Methods
inheritance and : 13.12. Solving the Data Inheritance Problem

surface copies : 11.12. Copying Data Structures

surl script : 20.8. Finding Fresh Links

switch statement

19.8. Redirecting to a Different Location
19.12. Writing a Multiscreen CGI Script

Symbol::qualify( ) : 12.5. Determining the Caller's Package

symbolic links : 9.0. Introduction

duplicating directory trees : 9.11. Program: symirror
to packages : 12.13. Referring to Packages Indirectly

symirror program (example) : 9.11. Program: symirror

symmetric differences of lists : 4.8. Computing Union, Intersection, or Difference of Unique Lists

Sys::Hostname module : 17.8. Finding Your Own Name and Address

Sys::Syslog module : 17.17. Program: backsniff

syscall( ) : 3.9. High-Resolution Timers

sysopen( ) : 7.1. Opening a File

strange filenames with : 7.2. Opening Files with Unusual Filenames

sysread( )

8.0. Introduction
17.0. Introduction

sysseek( ) : 8.0. Introduction

system( )

16.2. Running Another Program
19.6. Executing Commands Without Shell Escapes

SysV IPC : 16.12. Sharing Variables in Different Processes

syswrite( )

8.0. Introduction
17.0. Introduction

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