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<html><head><title>Index: U</title></head><body bgcolor="#FFFFFF" text="#000000"><!-- START OF BODY --><!-- TOP BANNER --><p><img src="../gifs/smbanns.gif" usemap="#banner-map" border=0 alt="Book Home" ></a></p><map name="banner-map"><area alt="Learning Perl, 3rd. Ed." href="../index.htm" coords="1,-2,616,66" shape="rect"><area alt="Search this book" href="../jobjects/fsearch.htm" coords="629,-11,726,25" shape="rect"></map><!-- TOP INDEX LINKS --><p><a href="idx_0.htm">Symbols & Numbers</a>| <a href="idx_a.htm">A</a>| <a href="idx_b.htm">B</a>| <a href="idx_c.htm">C</a>| <a href="idx_d.htm">D</a>| <a href="idx_e.htm">E</a>| <a href="idx_f.htm">F</a>| <a href="idx_g.htm">G</a>| <a href="idx_h.htm">H</a>| <a href="idx_i.htm">I</a>| <a href="idx_j.htm">J</a>| <a href="idx_k.htm">K</a>| <a href="idx_l.htm">L</a>| <a href="idx_m.htm">M</a>| <a href="idx_n.htm">N</a>| <a href="idx_o.htm">O</a>| <a href="idx_p.htm">P</a>| <a href="idx_q.htm">Q</a>| <a href="idx_r.htm">R</a>| <a href="idx_s.htm">S</a>| <a href="idx_t.htm">T</a>| <a href="idx_u.htm">U</a>| <a href="idx_v.htm">V</a>| <a href="idx_w.htm">W</a>| <a href="idx_x.htm">X</a>| <a href="idx_y.htm">Y</a>| <a href="idx_z.htm">Z</a></FONT><!-- INDEX SECTION BODY --><H2>Index: U</H2><DL><!-- ========================== --><a name="uid-user-ID"><dt>uid (user-ID): <a href="../ch11_06.htm#INDEX-803">11.6.1. The stat and lstat Functions</a></dt><!-- ========================== --><a name="undef-operator"><dt>undef operator: <a href="../ch02_12.htm#INDEX-257">2.12. The defined Function</a></dt><dd><dl> <a name="slices-and"> <dt>slices and: <a href="../ch17_06.htm#INDEX-1115">17.6. Slices</a></dt> </dl></dd><!-- ========================== --><a name="undef-value"><dt>undef value: <a href="../ch02_11.htm#INDEX-252">2.11. The undef Value</a></dt><!-- ========================== --><a name="underscore-_"><dt>underscore (_)</dt><dd><dl> <a name="in-integer-literals"> <dt>in integer literals: <a href="../ch02_02.htm#INDEX-123">2.2.3. Integer Literals</a></dt> <a name="in-variable-names"> <dt>in variable names: <a href="../ch04_10.htm#INDEX-361">4.10. The use strict Pragma</a></dt> </dl></dd><!-- ========================== --><a name="underscore-filehandle"><dt>underscore filehandle: <a href="../ch11_06.htm#INDEX-843">11.6.5. Using the Special Underscore Filehandle</a></dt><!-- ========================== --><a name="Unicode"><dt>Unicode: <a href="../appb_30.htm#INDEX-1327"> B.30. Locales and Unicode</a></dt><!-- ========================== --><a name="Universal-Time"><dt>Universal Time: <a href="../ch11_06.htm#INDEX-830">11.6.2. The localtime Function</a></dt><!-- ========================== --><a name="Unix"><dt>Unix</dt><dd><dl> <a name="input-output-and"> <dt>input/output and: <a href="../ch11_01.htm#INDEX-736">11.1. What Is a Filehandle?</a></dt> <a name="model-of-files-directories-and"> <dt>model of files/directories and: <a href="../ch13_03.htm#INDEX-887">13.3. Links and Files</a></dt> <a name="portability-and"> <dt>portability and: <a href="../ch01_01.htm#INDEX-8">1.1.2. Why Are There So Many Footnotes?</a></dt> <a name="utilities-for"> <dt>utilities for</dt><dd><dl> <a name="diamond-operator-and"> <dt>diamond operator and: <a href="../ch06_02.htm#INDEX-435">6.2. Input from the Diamond Operator</a></dt> <a name="regular-expressions-and"> <dt>regular expressions and: <a href="../ch07_01.htm#INDEX-492">7. Concepts of Regular Expressions</a></dt> </dl></dd> </dl></dd><!-- ========================== --><a name="Unix-password-databases"><dt>Unix password databases: <a href="../appb_07.htm#INDEX-1196"> B.7.1. Direct System Database Access</a></dt><!-- ========================== --><a name="Unix-signals-sending-receiving"><dt>Unix signals, sending/receiving: <a href="../ch14_07.htm#INDEX-985">14.7. Sending and Receiving Signals</a></dt><!-- ========================== --><a name="unless-control-structure"><dt>unless control structure: <a href="../ch10_01.htm#INDEX-635">10.1. The unless Control Structure</a></dt><!-- ========================== --><a name="unless-modifier"><dt>unless modifier: <a href="../ch10_03.htm#INDEX-647">10.3. Expression Modifiers</a></dt><dd><dl> <dt><a href="../ch10_03.htm#INDEX-653">10.3. Expression Modifiers</a></dt></dl></dd><!-- ========================== --><a name="unlink-operator"><dt>unlink operator: <a href="../ch13_01.htm#INDEX-878">13.1. Removing Files</a></dt><!-- ========================== --><a name="unpack-function"><dt>unpack function: <a href="../ch16_02.htm#INDEX-1046">16.2. Manipulating Data with pack and unpack</a></dt><!-- ========================== --><a name="unquoted-hash-keys"><dt>unquoted hash keys: <a href="../ch17_04.htm#INDEX-1099">17.4. Unquoted Hash Keys</a></dt><!-- ========================== --><a name="unshift-operator"><dt>unshift operator: <a href="../ch03_04.htm#INDEX-286">3.4.2. The shift and unshift Operators</a></dt><!-- ========================== --><a name="until-control-structure"><dt>until control structure: <a href="../ch10_02.htm#INDEX-643">10.2. The until Control Structure</a></dt><!-- ========================== --><a name="until-modifier"><dt>until modifier: <a href="../ch10_03.htm#INDEX-648">10.3. Expression Modifiers</a></dt><dd><dl> <dt><a href="../ch10_03.htm#INDEX-652">10.3. Expression Modifiers</a></dt></dl></dd><!-- ========================== --><a name="unwinding-hashes"><dt>unwinding hashes: <a href="../ch05_02.htm#INDEX-390">5.2.1. The Hash as a Whole</a></dt><!-- ========================== --><a name="uppercase"><dt>uppercase</dt><dd><dl> <a name="case-shifting-and"> <dt>case shifting and: <a href="../ch09_06.htm#INDEX-620">9.6.5. Case Shifting</a></dt> <a name="vs.-lowercase-in-variable-names"> <dt>vs. lowercase in variable names: <a href="../ch02_05.htm#INDEX-182">2.5.1. Choosing Good Variable Names</a></dt> </dl></dd><!-- ========================== --><a name="URLs"><dt>URLs</dt><dd><dl> <a name="code-in-this-book"> <dt>code in this book: <a href="../ch00_03.htm#INDEX-2">0.3. Code Examples</a></dt> <a name="CPAN"> <dt>CPAN: <a href="../ch01_03.htm#INDEX-34">1.3.1. What Is CPAN?</a></dt><dd><dl> <dt><a href="../appb_04.htm#INDEX-1145"> B.4.3. Finding and Installing Modules</a></dt> </dl></dd> <a name="Perl-Monastery"> <dt>Perl Monastery: <a href="../ch01_03.htm#INDEX-53">1.3.3. Are There Any Other Kinds of Support?</a></dt> <a name="search-interfaces-for-Perl"> <dt>search interfaces for Perl: <a href="../ch01_03.htm#INDEX-35">1.3.1. What Is CPAN?</a></dt> </dl></dd><!-- ========================== --><a name="use-directives"><dt>use directives: <a href="../appb_04.htm#INDEX-1147"> B.4.3. Finding and Installing Modules</a></dt><dd><dl> <a name="pragmas-and"> <dt>pragmas and: <a href="../appb_06.htm#INDEX-1181"> B.6. Pragmas</a></dt> </dl></dd><!-- ========================== --><a name="use-strict-pragma"><dt>use strict pragma: <a href="../ch04_10.htm#INDEX-357">4.10. The use strict Pragma</a></dt><dd><dl> <dt><a href="../appb_06.htm#INDEX-1186"> B.6.4. The strict Pragma</a></dt></dl></dd><!-- ========================== --><a name="user-functions"><dt>user functions (see <a href="idx_s.htm#subroutines">subroutines</a>)</dt><!-- ========================== --><a name="user-ID-numeric-$uid"><dt>user-ID, numeric ($uid): <a href="../ch11_06.htm#INDEX-812">11.6.1. The stat and lstat Functions</a></dt><dd><dl> <a name="changing-file-ownership-and"> <dt>changing file ownership and: <a href="../ch13_06.htm#INDEX-917">13.6. Changing Ownership</a></dt> </dl></dd><!-- ========================== --><a name="user-ID-uid"><dt>user-ID (uid): <a href="../ch11_06.htm#INDEX-802">11.6.1. The stat and lstat Functions</a></dt><!-- ========================== --><a name="utilities"><dt>utilities</dt><dd><dl> <a name="inside"> <dt>inside: <a href="../appb_04.htm#INDEX-1141"> B.4.3. Finding and Installing Modules</a></dt> <a name="perlbug"> <dt>perlbug: <a href="../ch01_03.htm#INDEX-59">1.3.4. What If I Find a Bug in Perl?</a></dt> <a name="Unix"> <dt>Unix (see <a href="idx_u.htm#Unix-utilities-for">Unix, utilities for</a>)</dt> <a name="which_dbm"> <dt>which_dbm: <a href="../ch16_01.htm#INDEX-1033">16.1. DBM Files and DBM Hashes</a></dt> </dl></dd><!-- ========================== --><a name="utime-function"><dt>utime function: <a href="../ch13_07.htm#INDEX-922">13.7. Changing Timestamps</a></dt></dl><!-- BOTTOM INDEX LINKS --><p><hr width="684" align="LEFT"><a href="idx_0.htm">Symbols & Numbers</a>| <a href="idx_a.htm">A</a>| <a href="idx_b.htm">B</a>| <a href="idx_c.htm">C</a>| <a href="idx_d.htm">D</a>| <a href="idx_e.htm">E</a>| <a href="idx_f.htm">F</a>| <a href="idx_g.htm">G</a>| <a href="idx_h.htm">H</a>| <a href="idx_i.htm">I</a>| <a href="idx_j.htm">J</a>| <a href="idx_k.htm">K</a>| <a href="idx_l.htm">L</a>| <a href="idx_m.htm">M</a>| <a href="idx_n.htm">N</a>| <a href="idx_o.htm">O</a>| <a href="idx_p.htm">P</a>| <a href="idx_q.htm">Q</a>| <a href="idx_r.htm">R</a>| <a href="idx_s.htm">S</a>| <a href="idx_t.htm">T</a>| <a href="idx_u.htm">U</a>| <a href="idx_v.htm">V</a>| <a href="idx_w.htm">W</a>| <a href="idx_x.htm">X</a>| <a href="idx_y.htm">Y</a>| <a href="idx_z.htm">Z</a></font><!-- LIBRARY NAV BAR --><hr width="684" align="left"><img src="../../gifs/smnavbar.gif" usemap="#library-map" border="0" alt="Library Navigation Links"><p><font size="-1"><a href="../copyrght.htm">Copyright © 2002</a>O'Reilly & Associates, Inc.All Rights Reserved.</font></p><map name="library-map"><area shape="rect" coords="1,0,85,94" href="../../index.htm"><area shape="rect" coords="86,1,178,103" href="../../lwp/index.htm"><area shape="rect" coords="180,0,265,103" href="../../lperl/index.htm"><area shape="rect" coords="267,0,353,105" href="../../perlnut/index.htm"><area shape="rect" coords="354,1,446,115" href="../../prog/index.htm"><area shape="rect" coords="448,0,526,132" href="../../tk/index.htm"><area shape="rect" coords="528,1,615,119" href="../../cookbook/index.htm"><area shape="rect" coords="617,0,690,135" href="../../pxml/index.htm"></map><!-- END OF BODY --></body></html>⌨️ 快捷键说明
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