ch08_01.htm

by Randal L. Schwartz and Tom Phoenix ISBN 0-596-00132-0 Third Edition, published July 2001. (See

</tr>
<tr>
<td>
<p>Net::netent</p>
</td>
<td>
<p>By-name interface to Perl's built-in
<tt class="literal">getnet*</tt> functions
</p>
</td>
</tr>
<tr>
<td>
<p>Net::Netrc</p>
</td>
<td>
<p>OO interface to user's netrc file (new in 5.8)</p>
</td>
</tr>
<tr>
<td>
<p>Net::NNTP</p>
</td>
<td>
<p>NNTP Client class (new in 5.8)</p>
</td>
</tr>
<tr>
<td>
<p>Net::Ping</p>
</td>
<td>
<p>Checks whether a host is online</p>
</td>
</tr>
<tr>
<td>
<p>Net::POP3	</p>
</td>
<td>
<p>Post Office Protocol 3 Client class (new in 5.8)</p>
</td>
</tr>
<tr>
<td>
<p>Net::protoent</p>
</td>
<td>
<p>By-name interface to Perl's built-in
<tt class="literal">getproto*</tt> functions
</p>
</td>
</tr>
<tr>
<td>
<p>Net::servent</p>
</td>
<td>
<p>By-name interface to Perl's built-in
<tt class="literal">getserv*</tt> functions
</p>
</td>
</tr>
<tr>
<td>
<p>Net::SMTP</p>
</td>
<td>
<p>Simple Mail Transfer Protocol Client class (new in 5.8)</p>
</td>
</tr>
<tr>
<td>
<p>Net::Time</p>
</td>
<td>
<p>Time and daytime network client interface (new in 5.8)</p>
</td>
</tr>
<tr>
<td>
<p>ODBM_File</p>
</td>
<td>
<p>Tied access to ODBM files</p>
</td>
</tr>
<tr>
<td>
<p>Opcode</p>
</td>
<td>
<p>Disables named opcodes when compiling Perl code</p>
</td>
</tr>
<tr>
<td>
<p>ops</p>
</td>
<td>
<p>Restricts unsafe operations when compiling</p>
</td>
</tr>
<tr>
<td>
<p>overload</p>
</td>
<td>
<p>Overloads Perl's mathematical operations</p>
</td>
</tr>
<tr>
<td>
<p>PerlIO</p>
</td>
<td>
<p>On-demand loader for PerlIO layers and root of PerlIO::* namespace
(added in 5.8)
</p>
</td>
</tr>
<tr>
<td>
<p>PerlIO::Scalar</p>
</td>
<td>
<p>Support module for in-memory I/O (new in 5.8)</p>
</td>
</tr>
<tr>
<td>
<p>PerlIO::Via</p>
</td>
<td>
<p>Helper class for PerlIO layers implemented in Perl (new in 5.8)</p>
</td>
</tr>
<tr>
<td>
<p>Pod::Functions</p>
</td>
<td>
<p>Used in converting from pod to HTML</p>
</td>
</tr>
<tr>
<td>
<p>Pod::Html</p>
</td>
<td>
<p>Module to convert pod files to HTML</p>
</td>
</tr>
<tr>
<td>
<p>Pod::ParseLink</p>
</td>
<td>
<p>Parses link-formatting code in POD documents (new in 5.8)</p>
</td>
</tr>
<tr>
<td>
<p>Pod::Text</p>
</td>
<td>
<p>Converts pod data to formatted ASCII text</p>
</td>
</tr>
<tr>
<td>
<p>POSIX</p>
</td>
<td>
<p>Perl interface to IEEE Std 1003.1</p>
</td>
</tr>
<tr>
<td>
<p>re</p>
</td>
<td>
<p>Perl pragma to alter regular expression behavior</p>
</td>
</tr>
<tr>
<td>
<p>Safe</p>
</td>
<td>
<p>Creates safe namespaces for evaluating Perl code</p>
</td>
</tr>
<tr>
<td>
<p>Scalar::Util</p>
</td>
<td>
<p>A selection of general-utility scalar subroutines (new in 5.8)</p>
</td>
</tr>
<tr>
<td>
<p>SDBM_File</p>
</td>
<td>
<p>Tied access to SDBM files</p>
</td>
</tr>
<tr>
<td>
<p>Search::Dict</p>
</td>
<td>
<p>Searches for key in dictionary file</p>
</td>
</tr>
<tr>
<td>
<p>SelectSaver</p>
</td>
<td>
<p>Saves and restores selected filehandle</p>
</td>
</tr>
<tr>
<td>
<p>SelfLoader</p>
</td>
<td>
<p>Loads functions only on demand</p>
</td>
</tr>
<tr>
<td>
<p>Shell</p>
</td>
<td>
<p>Runs shell commands transparently within Perl</p>
</td>
</tr>
<tr>
<td>
<p>sigtrap</p>
</td>
<td>
<p>Enables stack backtrace on unexpected signals</p>
</td>
</tr>
<tr>
<td>
<p>Socket</p>
</td>
<td>
<p>Loads the C <em class="emphasis">socket.h</em> defines and structure
manipulators
</p>
</td>
</tr>
<tr>
<td>
<p>sort</p>
</td>
<td>
<p>Perl pragma that controls sort behavior (new in 5.8)</p>
</td>
</tr>
<tr>
<td>
<p>Storable</p>
</td>
<td>
<p>Persistence for Perl data structures (new in 5.8)</p>
</td>
</tr>
<tr>
<td>
<p>strict</p>
</td>
<td>
<p>Restricts unsafe constructs</p>
</td>
</tr>
<tr>
<td>
<p>subs</p>
</td>
<td>
<p>Predeclares subroutine names</p>
</td>
</tr>
<tr>
<td>
<p>Switch</p>
</td>
<td>
<p>A switch statement for Perl (new in 5.8)</p>
</td>
</tr>
<tr>
<td>
<p>Symbol</p>
</td>
<td>
<p>Generates anonymous globs; qualifies variable names</p>
</td>
</tr>
<tr>
<td>
<p>Sys::Hostname</p>
</td>
<td>
<p>Tries every conceivable way to get hostname</p>
</td>
</tr>
<tr>
<td>
<p>Sys::Syslog</p>
</td>
<td>
<p>Perl interface to Unix <tt class="literal">syslog(3)</tt> calls</p>
</td>
</tr>
<tr>
<td>
<p>Term::Cap</p>
</td>
<td>
<p>Terminal capabilities interface</p>
</td>
</tr>
<tr>
<td>
<p>Term::Complete</p>
</td>
<td>
<p>Word completion module</p>
</td>
</tr>
<tr>
<td>
<p>Term::ReadLine</p>
</td>
<td>
<p>Interface to various ReadLine packages</p>
</td>
</tr>
<tr>
<td>
<p>Test</p>
</td>
<td>
<p>Framework for writing test scripts</p>
</td>
</tr>
<tr>
<td>
<p>Test::Builder</p>
</td>
<td>
<p>Backend for building text libraries (new in 5.8)</p>
</td>
</tr>
<tr>
<td>
<p>Test::Harness</p>
</td>
<td>
<p>Runs Perl standard test scripts with statistics</p>
</td>
</tr>
<tr>
<td>
<p>Test::More</p>
</td>
<td>
<p>Yet another framework for writing test scripts (new in 5.8)</p>
</td>
</tr>
<tr>
<td>
<p>Test::Simple</p>
</td>
<td>
<p>Basic utilities for writing tests (new in 5.8)</p>
</td>
</tr>
<tr>
<td>
<p>Text::Abbrev</p>
</td>
<td>
<p>Creates an abbreviation table from a list</p>
</td>
</tr>
<tr>
<td>
<p>Text::Balanced</p>
</td>
<td>
<p>Extracts delimited text sequences from strings (new in 5.8)</p>
</td>
</tr>
<tr>
<td>
<p>Text::ParseWords</p>
</td>
<td>
<p>Parses text into a list of tokens</p>
</td>
</tr>
<tr>
<td>
<p>Text::Soundex</p>
</td>
<td>
<p>The soundex algorithm described by Knuth</p>
</td>
</tr>
<tr>
<td>
<p>Text::Tabs</p>
</td>
<td>
<p>Expands and unexpands tabs</p>
</td>
</tr>
<tr>
<td>
<p>Text::Wrap</p>
</td>
<td>
<p>Wraps text into a paragraph</p>
</td>
</tr>
<tr>
<td>
<p>Thread</p>
</td>
<td>
<p>Multithreading support</p>
</td>
</tr>
<tr>
<td>
<p>Thread::Queue</p>
</td>
<td>
<p>Thread-safe queues</p>
</td>
</tr>
<tr>
<td>
<p>Thread::Semaphore</p>
</td>
<td>
<p>Thread-safe semaphores</p>
</td>
</tr>
<tr>
<td>
<p>Thread::Signal</p>
</td>
<td>
<p>Starts a thread that runs signal handlers reliably</p>
</td>
</tr>
<tr>
<td>
<p>Thread::Specific</p>
</td>
<td>
<p>Thread-specific keys</p>
</td>
</tr>
<tr>
<td>
<p>Tie::Array</p>
</td>
<td>
<p>Base class definitions for tied arrays</p>
</td>
</tr>
<tr>
<td>
<p>Tie::File</p>
</td>
<td>
<p>Accesses the lines of a disk file via a Perl array (new in 5.8)</p>
</td>
</tr>
<tr>
<td>
<p>Tie::Handle</p>
</td>
<td>
<p>Base class definitions for tied handles</p>
</td>
</tr>
<tr>
<td>
<p>Tie::Hash</p>
</td>
<td>
<p>Base class definitions for tied hashes</p>
</td>
</tr>
<tr>
<td>
<p>Tie::Memorize</p>
</td>
<td>
<p>Adds data to a hash when needed (new in 5.8)</p>
</td>
</tr>
<tr>
<td>
<p>Tie::RefHash</p>
</td>
<td>
<p>Uses references as hash keys</p>
</td>
</tr>
<tr>
<td>
<p>Tie::Scalar</p>
</td>
<td>
<p>Base class definitions for tied scalars</p>
</td>
</tr>
<tr>
<td>
<p>Tie::SubstrHash</p>
</td>
<td>
<p>Fixed table size, fixed key length hashing</p>
</td>
</tr>
<tr>
<td>
<p>Time::gmtime</p>
</td>
<td>
<p>By-name interface to Perl's built-in
<tt class="literal">gmtime</tt> function
</p>
</td>
</tr>
<tr>
<td>
<p>Time::HiRes</p>
</td>
<td>
<p>High-resolution alarm, sleep, gettimeofday, interval timers (new in
5.8)
</p>
</td>
</tr>
<tr>
<td>
<p>Time::Local</p>
</td>
<td>
<p>Computes time from local and GMT time</p>
</td>
</tr>
<tr>
<td>
<p>Time::localtime</p>
</td>
<td>
<p>By-name interface to Perl's built-in
<tt class="literal">localtime</tt> function
</p>
</td>
</tr>
<tr>
<td>
<p>Time::tm</p>
</td>
<td>
<p>Internal object used by Time::gmtime and Time::localtime</p>
</td>
</tr>
<tr>
<td>
<p>UNIVERSAL</p>
</td>
<td>
<p>Base class for all classes (blessed references)</p>
</td>
</tr>
<tr>
<td>
<p>User::grent</p>
</td>
<td>
<p>By-name interface to Perl's built-in
<tt class="literal">getgr*</tt> functions
</p>
</td>
</tr>
<tr>
<td>
<p>User::pwent</p>
</td>
<td>
<p>By-name interface to Perl's built-in
<tt class="literal">getpw*</tt> functions
</p>
</td>
</tr>
<tr>
<td>
<p>utf8</p>
</td>
<td>
<p>Perl pragma to enable/disable UTF-8 in source code</p>
</td>
</tr>
<tr>
<td>
<p>vars</p>
</td>
<td>
<p>Predeclares global variable names</p>
</td>
</tr>
<tr>
<td>
<p>vmsish</p>
</td>
<td>
<p>Perl pragma that controls VMS-specific language features (new in 5.8)</p>
</td>
</tr>
<tr>
<td>
<p>XS::Typemap</p>
</td>
<td>
<p>Module that tests the XS typemaps distributed with Perl (new in
5.8)<a name="INDEX-1266" /></a>
</p>
</td>
</tr>

</table><p>

<p>In the remainder of this chapter, the modules are arranged in
alphabetical order for easy reference. For more detail about a
module, use the
<em class="emphasis">perldoc</em><a name="INDEX-1267" /></a> command to read the manpage for that
module (see <a href="ch04_01.htm">Chapter 4, "The Perl Language"</a> for information on
<em class="emphasis">perldoc</em>).
</p>
<div class="sect1"><a name="perlnut2-CHP-8-SECT-1" /></a>
<h2 class="sect1">8.1. AnyDBM_File</h2>

<p><a name="INDEX-1268" /></a>Provides
a single Database Manager (DBM) interface regardless of the DBM
implementation you use. The module inherits from the various DBM
packages; by default, it inherits from NDBM_File. If it
doesn't find NDBM_File, the default search order is:
DB_File, GDBM_File, SDBM_File (which comes with Perl), and finally,
ODBM_File. You can override this default order by redefining
<tt class="literal">@ISA</tt>:
</p>

<blockquote><pre class="code">@AnyDBM_File::ISA = qw(DB_File GDBM_File NDBM_File);</pre></blockquote>

<p>However, an explicit <tt class="literal">use</tt> takes priority over the
<tt class="literal">@ISA</tt> ordering.
</p>

<p>Perl's <tt class="literal">dbmopen</tt> function simply
calls <tt class="literal">tie</tt> to bind a hash to AnyDBM_File. The
effect is to bind the hash to one of the specific DBM classes that
AnyDBM_File inherits from.
</p>

</div>

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