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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="Book Title" 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="----U-uppercase-characters"><dt>U (uppercase) characters: <a href="../ch04_06.htm#INDEX-675">4.6.4. Character Classes</a></dt><!-- ========================== --><a name="u-command-CPAN.pm"><dt>u command (CPAN.pm): <a href="../ch02_04.htm#INDEX-123">2.4.4. Installing Modules with the CPAN Module</a></dt><!-- ========================== --><a name="-u-file-test-operator"><dt>-u file test operator: <a href="../ch04_05.htm#INDEX-550">4.5.8. File Test Operators</a></dt><!-- ========================== --><a name="-u-option-dprofpp"><dt>-u option (dprofpp): <a href="../ch06_05.htm#INDEX-1203">6.5. The Perl Profiler</a></dt><!-- ========================== --><a name="uc"><dt>uc( ): <a href="../ch05_01.htm#INDEX-1088">5. Function Reference</a></dt><!-- ========================== --><a name="ucfirst"><dt>ucfirst( ): <a href="../ch05_01.htm#INDEX-1089">5. Function Reference</a></dt><!-- ========================== --><a name="$UID-$<-variable"><dt>$UID ($<) variable: <a href="../ch04_04.htm#INDEX-342">4.4.1. Global Special Variables</a></dt><!-- ========================== --><a name="uidl-Net-:-:POP3"><dt>uidl( ) (Net::POP3): <a href="../ch16_01.htm#INDEX-2055">16.1.3. Retrieving Email with Net::POP3</a></dt><!-- ========================== --><a name="umask"><dt>umask( ): <a href="../ch05_01.htm#INDEX-1090">5. Function Reference</a></dt><!-- ========================== --><a name="unary-operators"><dt>unary operators: <a href="../ch04_05.htm#INDEX-436">4.5.2. Unary Operators</a></dt><!-- ========================== --><a name="unbind-method-Net-:-:LDAP"><dt>unbind method (Net::LDAP): <a href="../ch19_04.htm#INDEX-2362">19.4. Net::LDAP Methods</a></dt><!-- ========================== --><a name="uncompress-command"><dt>uncompress command: <a href="../ch02_03.htm#INDEX-49">2.3.1. Installing on Unix</a></dt><!-- ========================== --><a name="uncompressing-Perl-source-code"><dt>uncompressing Perl source code: <a href="../ch02_03.htm#INDEX-67">2.3.2.2. Standard Perl distribution</a></dt><!-- ========================== --><a name="undef"><dt>undef( ): <a href="../ch05_01.htm#INDEX-1091">5. Function Reference</a></dt><!-- ========================== --><a name="undef-value"><dt>undef value: <a href="../ch04_02.htm#INDEX-236">4.2.5. Variables</a></dt><!-- ========================== --><a name="undelete_message-Mail-:-:Folder"><dt>undelete_message( ) (Mail::Folder): <a href="../ch16_02.htm#INDEX-2139">16.2.3. Handle Folders with Mail::Folder</a></dt><!-- ========================== --><a name="-underline-option-widgets"><dt>-underline option (widgets): <a href="../ch21_03.htm#INDEX-2833">21.3. Common Widget Configuration Options</a></dt><!-- ========================== --><a name="underscore-_"><dt>underscore (_)</dt><dd><dl> <a name="filehandle"> <dt>filehandle: <a href="../ch04_04.htm#INDEX-393">4.4.3. Global Special Filehandles</a></dt> <a name="improving-number-legibility"> <dt>improving number legibility: <a href="../ch04_02.htm#INDEX-226">4.2.1. Numbers</a></dt> </dl></dd><!-- ========================== --><a name="unescape_from-Mail-:-:Internet"><dt>unescape_from( ) (Mail::Internet): <a href="../ch16_02.htm#INDEX-2157">16.2.5. Mail::Internet Reference</a></dt><!-- ========================== --><a name="unicode"><dt>unicode: <a href="../ch04_11.htm#INDEX-792">4.11. Unicode</a></dt><!-- ========================== --><a name="unique_name-Net-:-:FTP"><dt>unique_name( ) (Net::FTP): <a href="../ch18_02.htm#INDEX-2325">18.2. Net::FTP</a></dt><!-- ========================== --><a name="UNIVERSAL-module"><dt>UNIVERSAL module: <a href="../ch08_228.htm#INDEX-1599">8.228. UNIVERSAL</a></dt><!-- ========================== --><a name="Unix-domain-sockets"><dt>Unix-domain sockets: <a href="../ch15_01.htm#INDEX-1903">15. Sockets</a></dt><!-- ========================== --><a name="Unix-systems"><dt>Unix systems</dt><dd><dl> <a name="#!-shebang-line"> <dt>#! (shebang) line: <a href="../ch03_01.htm#INDEX-139">3. The Perl Executable</a></dt> <a name="command-processing"> <dt>command processing: <a href="../ch03_01.htm#INDEX-150">3.1. Command Processing</a></dt> <a name="installing-Perl-on"> <dt>installing Perl on: <a href="../ch02_03.htm#INDEX-44">2.3.1. Installing on Unix</a></dt> </dl></dd><!-- ========================== --><a name="unless-modifier"><dt>unless modifier: <a href="../ch04_03.htm#INDEX-288">4.3.1.4. Modifiers</a></dt><!-- ========================== --><a name="unless-statement"><dt>unless statement: <a href="../ch04_03.htm#INDEX-279">4.3.1. Conditionals and Loops</a></dt><!-- ========================== --><a name="unlink"><dt>unlink( ): <a href="../ch05_01.htm#INDEX-1092">5. Function Reference</a></dt><!-- ========================== --><a name="unmark-News-:-:Newsrc"><dt>unmark( ) (News::Newsrc): <a href="../ch17_03.htm#INDEX-2270">17.3.1. News::Newsrc Reference</a></dt><!-- ========================== --><a name="unmarked_articles-News-:-:Newsrc"><dt>unmarked_articles( ) (News::Newsrc): <a href="../ch17_03.htm#INDEX-2271">17.3.1. News::Newsrc Reference</a></dt><!-- ========================== --><a name="unmark_list-News-:-:Newsrc"><dt>unmark_list( ) (News::Newsrc): <a href="../ch17_03.htm#INDEX-2272">17.3.1. News::Newsrc Reference</a></dt><!-- ========================== --><a name="unmark_range-News-:-:Newsrc"><dt>unmark_range( ) (News::Newsrc): <a href="../ch17_03.htm#INDEX-2273">17.3.1. News::Newsrc Reference</a></dt><!-- ========================== --><a name="unpack"><dt>unpack( ): <a href="../ch05_01.htm#INDEX-1093">5. Function Reference</a></dt><!-- ========================== --><a name="unpacking-Perl-source-code"><dt>unpacking Perl source code: <a href="../ch02_03.htm#INDEX-68">2.3.2.2. Standard Perl distribution</a></dt><!-- ========================== --><a name="unpack_sockaddr_in-Socket"><dt>unpack_sockaddr_in( ) (Socket): <a href="../ch15_01.htm#INDEX-1935">15.1.4. Socket Module Functions</a></dt><!-- ========================== --><a name="unpack_sockaddr_un-Socket"><dt>unpack_sockaddr_un( ) (Socket): <a href="../ch15_01.htm#INDEX-1936">15.1.4. Socket Module Functions</a></dt><!-- ========================== --><a name="Unparsed-handler-Expat"><dt>Unparsed handler (Expat): <a href="../ch13_03.htm#INDEX-1831">13.3. Expat Handlers</a></dt><!-- ========================== --><a name="unpost-Menu-widget"><dt>unpost( ) (Menu widget): <a href="../ch21_15.htm#INDEX-3103">21.15.2. Menu Methods</a></dt><!-- ========================== -->⌨️ 快捷键说明
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