Symbols

# (pound sign) in server side includes, Common Errors

#! (pound-bang) line, CGI applications, The Pound-Bang

#PCDATA, Document Type Definition

#REQUIRED keyword, XML documents, Document Type Definition

$CGI variable, Address book CGI script, Address book CGI script

determining flow of control through CGI script, Address book CGI script

$CGI::HEADERS_ONCE variable, Error Subroutines

$CGI::POST_MAX, File Uploads with CGI.pm, Hidden Fields

limiting user shopping carts with, Hidden Fields

$db, using, DB_File

$element, start element name (XML), CGI Gateway to XML Middleware

$expat, reference to XML::Parser object, CGI Gateway to XML Middleware

$q prefix CGI.pm module, Standard and Object-Oriented Syntax

% (percent sign), Elements of a URL, Search Application

hashes, use of, Search Application

URL encoding, Elements of a URL

% (percent sign) for date/time format, Tailoring SSI Output

%attributes, hash table of attributes declared inside XML element, CGI Gateway to XML Middleware

* (asterisk) symbol (quantity identifier), XML elements, Document Type Definition

*/* (media types), Media Type

+ (plus sign), Elements of a URL, URL Encoding, Index queries, Document Type Definition

encoding spaces in URLs, URL Encoding

keywords, separating in queries, Index queries

URL encoding, Elements of a URL

XML elements, Document Type Definition

-c flag, checking script syntax with, Debugging Tools

-d flag, The Perl debugger, ActiveState Perl debugger

ActiveState Perl debugger, invoking, ActiveState Perl debugger

using for interactive session, The Perl debugger

-dir option, Inverted Index Search

-e operator, Image Processing

-f and -F options, sendmail, Command-Line Options

-i option, sendmail, Command-Line Options

-ignore option, Inverted Index Search

-il options, Searching One by One

-index option, Inverted Index Search, Inverted Index Search

-M operator, Server Side Includes, Search Application

-noscript argument (start_html method), start_html

-numbers option, Inverted Index Search, Inverted Index Search

-odq option, sendmail, Mail Queue

-script argument (start_html method), start_html

-stem option, Inverted Index Search

-T operator, Searching One by One, Take Two, Inverted Index Search

-t option, sendmail, Command-Line Options, Command-Line Options, mailx and mail, Perl Mailers

mailx and mail, not offering comparable option, mailx and mail

Mail::Mailer module, use with, Perl Mailers

reasons to use, Command-Line Options

-target argument (header method), Specifying an alternative target

-unique_headers flag, Error Subroutines

-v flag, getting perl version, The Pound-Bang

-wc switch, checking for Perl syntax errors, “Malformed” Header

-wT flags, Sample CGI

-xbase argument (start_html method), start_html

.epl files (Embperl), Embperl handler

.forward file, procmail

.pm extension (Perl modules), Custom Module

.procmailrc file, procmail, Autoreply from nobody

creating, example, Autoreply from nobody

.shtml files, Configuration

200 OK status code, Specifying status codes

204 No Response status code, Specifying status codes

301 Moved Permanently status code, Specifying status codes

302 Found status header, Specifying status codes

307 Temporary Redirect status code, Specifying status codes

400 Bad Request status code, Specifying status codes

401 Unauthorized status code, Specifying status codes

403 Forbidden status code, Specifying status codes

404 Not Found status code, Specifying status codes

405 Not Allowed status code, Specifying status codes

408 Request Timed Out status code, Specifying status codes

500 Internal Server Error, STDERR, CGI Output, Specifying status codes, Dying Gracefully, CGI::Carp, Error Subroutines, “Malformed” Header, Trap die

CGI::Carp and, CGI::Carp

die function and, Trap die

HTTP header printing and, Error Subroutines

malformed HTTP content type headers, causing, “Malformed” Header

status header, Specifying status codes

503 Service Unavailable, Specifying status codes

504 Gateway Timed Out status code, Specifying status codes

<!--# directives, Environment Variables (see Server Side Includes)

? (question mark) in place of * in XML elements, Document Type Definition

@ prefix, escaping with backslash (\\) character, Image Processing

@related, references to related URLs, CGI Gateway to XML Middleware

@subrelated, URLs related to first-level URL, CGI Gateway to XML Middleware

[] (brackets), Embperl code blocks, Embperl code blocks, Coding Guidelines

\[*] embedded in tag referencing current script and current URL passed as search parameter, CGI Gateway to XML Middleware

\\ (backslash), Lots of print Statements, Delimiters, Image Processing

double quotes in HTML, escaping with, Lots of print Statements

escaping @ prefix with, Image Processing

escaping characters with, Delimiters

~! (tilde escapes), mailx and mail programs, mailx and mail