idx_u.htm

编程珍珠,里面很多好用的代码,大家可以参考学习呵呵,

 </dl></dd>

<a name="unordered-lists">
<dt>unordered lists (see <a href="idx_h.htm#hashes">hashes</a>)
</dt>
<a name="unpack">
<dt>unpack: <a href="../ch25_02.htm#INDEX-4332">25.2. Endianness and Number Width</a></dt>
<a name="unpack-function">
<dt>unpack function: <a href="../ch29_02.htm#INDEX-5369">29.2.189. unpack</a></dt><dd><dl>
  <a name="fixed-width-fields-use-with">
  <a name="template-characters-for">
  <dt>template characters for: <a href="../ch29_02.htm#INDEX-">29.2.108. pack</a></dt>
</dl></dd>
<a name="unpacking-CPAN-modules">
<dt>unpacking CPAN modules: <a href="../ch22_02.htm#INDEX-3923">22.2.1. Decompressing and Unpacking CPAN Modules</a></dt>
<a name="unqualified-names-searching-for">
<dt>unqualified, names, searching for: <a href="../ch02_05.htm#INDEX-505">2.5.1. Name Lookups</a></dt>
<a name="unsafe-operations">
<dt>unsafe operations: <a href="../ch19_01.htm#INDEX-3452">19.1.3. Switches</a></dt>
<a name="unshift-function">
<dt>unshift function: <a href="../ch09_01.htm#INDEX-2074">9. Data Structures</a></dt><dd><dl>
  <dt><a href="../ch29_02.htm#INDEX-5376">29.2.190. unshift</a></dt>
</dl></dd>
<a name="unsigned-integers-lists-of-storing">
<dt>unsigned integers, lists of, storing: <a href="../ch29_02.htm#INDEX-5399">29.2.195. vec</a></dt>
<a name="unsigned-shorts">
<dt>unsigned shorts: <a href="../ch29_02.htm#INDEX-5269">29.2.162. sprintf</a></dt>
<a name="untie-function">
<dt>untie function: <a href="../ch14_01.htm#INDEX-2656">14. Tied Variables</a></dt><dd><dl>
  <dt><a href="../ch14_05.htm#INDEX-2762">14.5. A Subtle Untying Trap</a></dt>
  <dt><a href="../ch29_02.htm#INDEX-4711">29.2.21. dbmclose</a></dt>
  <dt><a href="../ch29_02.htm#INDEX-5379">29.2.191. untie</a></dt>
  <a name="outstanding-references-not-eliminating">
  <dt>outstanding references, not eliminating: <a href="../ch14_01.htm#INDEX-2681">14.1. Tying Scalars</a></dt>
</dl></dd>
<a name="until-loops">
<dt>until loops: <a href="../ch04_04.htm#INDEX-1075">4.4.1. while and until Statements</a></dt>
<a name="until-modifier">
<dt>until modifier: <a href="../ch04_01.htm#INDEX-1045">4.1. Simple Statements</a></dt>
<a name="untying-trap">
<dt>untying trap: <a href="../ch14_05.htm#INDEX-2760">14.5. A Subtle Untying Trap</a></dt>
<a name="up-method">
<dt>up method: <a href="../ch17_02.htm#INDEX-3211">17.2.3.2. Semaphores</a></dt>
<a name="upcase-function">
<dt>upcase function: <a href="../ch06_02.htm#INDEX-1823">6.2.1. Tricks with Parameter Lists</a></dt>
<a name="uppercase-converting-to">
<dt>uppercase, converting to: <a href="../ch02_06.htm#INDEX-572">2.6.2. String Literals</a></dt><dd><dl>
  <dt><a href="../ch05_02.htm#INDEX-1402">5.2.3. The s/// Operator (Substitution)</a></dt>
</dl></dd>


<a name="use">
<dt>use: <a href="../ch04_07.htm#INDEX-1183">4.7. Global Declarations</a></dt><dd><dl>
  <a name="global-and-lexical-scoping-of">
  <dt>global and lexical scoping of: <a href="../ch04_08.htm#INDEX-1190">4.8. Scoped Declarations</a></dt>
</dl></dd>
<a name="use-attributes-pragma">
<dt>use attributes pragma: <a href="../ch06_05.htm#INDEX-1874">6.5. Subroutine Attributes</a></dt>
<a name="use-base-declarations">
<dt>use base declarations: <a href="../ch12_05.htm#INDEX-2451">12.5.1. Inheritance Through @ISA</a></dt><dd><dl>
  <a name="pseudohash-implementations-requirement-with">
  <dt>pseudohash implementations, requirement with: <a href="../ch12_07.htm#INDEX-2539">12.7.1. Field Declarations with use fields</a></dt>
</dl></dd>
<a name="use-base-pragma">
<dt>use base pragma: <a href="../ch31_03.htm#INDEX-5419">31.3. use base</a></dt>
<a name="use-blib-pragma">
<dt>use blib pragma: <a href="../ch31_04.htm#INDEX-5421">31.4. use blib</a></dt>
<a name="use-bytes-pragma">
<dt>use bytes pragma: <a href="../ch15_02.htm#INDEX-2824">15.2. Effects of Character Semantics</a></dt>
<a name="use-charnames-pragma">
<dt>use charnames pragma: <a href="../ch15_02.htm#INDEX-2832">15.2. Effects of Character Semantics</a></dt>
<a name="use-command">
<dt>use command: <a href="../ch10_01.htm#INDEX-2185">10. Packages</a></dt>



<a name="use-declarations">
<dt>use declarations: <a href="../ch01_02.htm#INDEX-128">1.2.1.4. Simplicities</a></dt><dd><dl>
  <dt><a href="../ch04_07.htm#INDEX-1172">4.7. Global Declarations</a></dt>
  <dt><a href="../ch04_09.htm#INDEX-1238">4.9. Pragmas</a></dt>
  <dt>(see also <a href="idx_p.htm#pragmas">pragmas</a>)</dt>
    <dt>modules: <a href="../ch11_01.htm#INDEX-2292">11.1. Using Modules</a></dt><a name="tie-function-and">
  <dt>tie function and: <a href="../ch14_01.htm#INDEX-2672">14. Tied Variables</a></dt>
  <a name="use-strict">
  <dt>use strict: <a href="../ch24_01.htm#INDEX-4128">24.1.2. Frequently Ignored Advice</a></dt>
</dl></dd>

<a name="use-fields-declarations">
<dt>use fields declarations: <a href="../ch12_05.htm#INDEX-2453">12.5.1. Inheritance Through @ISA</a></dt>
<a name="use-fields-pragma">
<dt>use fields pragma:
  <a name="field-declarations-with">
<a href="../ch12_07.htm#INDEX-2528">12.7.1. Field Declarations with use fields</a></dt>

<a name="use-filetest-pragma">
<dt>use filetest pragma: <a href="../ch03_10.htm#INDEX-916">3.10. Named Unary and File Test Operators</a></dt>
<a name="use-overload-pragma">
<dt>use overload pragma: <a href="../ch13_01.htm#INDEX-2606">13.1. The overload Pragma</a></dt>
<a name="use-statement">
<dt>use statement: <a href="../ch21_01.htm#INDEX-3677">21.1. How Perl Works</a></dt>
<a name="use-subs-declarations">
<dt>use subs declarations: <a href="../ch12_05.htm#INDEX-2493">12.5.4. Method Autoloading</a></dt>
<a name="use-utf8-pragma">
<dt>use utf8 pragma: <a href="../ch05_03.htm#INDEX-1520">5.3.3. Wildcard Metasymbols</a></dt>
<a name="use-warnings-pragma">
<dt>use warnings pragma: <a href="../ch20_01.htm#INDEX-3504">20. The Perl Debugger</a></dt>
<a name="Usenet">
<dt>Usenet,
  <a name="Perl-modules-for">
  Perl modules for: <a href="../ch22_01.htm#INDEX-3886">22.1. The CPAN modules Directory</a></dt>

<a name="user-defined-functions">
<dt>user-defined functions (see <a href="idx_s.htm#subroutines">subroutines</a>)
</dt>
<a name="user-defined-subroutines">
<dt>user-defined subroutines: <a href="../ch01_02.htm#INDEX-146">1.2.2. Verbs</a></dt><dd><dl>
  <dt><a href="../ch01_02.htm#INDEX-147">1.2.2. Verbs</a></dt>
  <dt>(see also <a href="idx_s.htm#subroutines">subroutines</a>)</dt>
</dl></dd>
<a name="user-efficiency-Perl-programming">
<dt>user efficiency, Perl programming: <a href="../ch24_02.htm#INDEX-4240">24.2.6. User Efficiency</a></dt>
<a name="user-ID">
<dt>user ID (see <a href="idx_u.htm#UID">UID</a>)
</dt>
<a name="user-interfaces-modules-providing">
<dt>user interfaces, modules providing: <a href="../ch32_01.htm#INDEX-5599">32.1.11. User Interfaces</a></dt>
<a name="User::grent-module">
<dt>User::grent module: <a href="../ch29_02.htm#INDEX-4813">29.2.44. getgrent</a></dt><dd><dl>
  <dt><a href="../ch32_01.htm#INDEX-5545">32.1.7. Operating System Interfaces</a></dt>
</dl></dd>
<a name="username-passwd-file-entry-from">
<dt>username, passwd file entry from: <a href="../ch29_02.htm#INDEX-4889">29.2.62. getpwnam</a></dt>
<a name="User::pwent-module">
<dt>User::pwent module: <a href="../ch29_02.htm#INDEX-4894">29.2.63. getpwuid</a></dt><dd><dl>
  <dt><a href="../ch32_01.htm#INDEX-5546">32.1.7. Operating System Interfaces</a></dt>
  <a name="Class::Struct-using-to-create-objects-and-accessors">
  <dt>Class::Struct, using to create objects and accessors: <a href="../ch32_06.htm#INDEX-5811">32.6. Class::Struct</a></dt>
</dl></dd>
<a name="users">
<dt>users</dt><dd><dl>
  <a name="authenticating-Perl-modules-for">
  <dt>authenticating, Perl modules for: <a href="../ch22_01.htm#INDEX-3868">22.1. The CPAN modules Directory</a></dt>
  <a name="CPU-times">
  <dt>CPU times: <a href="../ch29_02.htm#INDEX-5346">29.2.181. times</a></dt>
  <a name="granting-limited-privileges-to">
  <dt>granting limited privileges to: <a href="../ch23_01.htm#INDEX-3959">23.1. Handling Insecure Data</a></dt>
  <a name="groups-of">
  
<dd><dl>
  </dl></dd>
<dt>information about, functions for getting: <a href="../ch29_01.htm#INDEX-">29.1. Perl Functions by Category</a></dt>

</dl></dd>

  

<a name="UTF-8">
<dt>UTF-8: <a href="../ch02_01.htm#INDEX-406">2.1. Atoms</a></dt><dd><dl>
  
<a name="UTF-8-characters">
<dt>characters,
  <a name="converting-to-integers">
converting to integers: <a href="../ch15_02.htm#INDEX-2858">15.2. Effects of Character Semantics</a></dt>

<a name="-globally-switching-interfaces-to">
  <dt> globally switching interfaces to: <a href="../ch28_02.htm#INDEX-4600">28.2. Special Variables in Alphabetical Order</a></dt>
<a name="utf8-module">
<dt>module: <a href="../ch32_01.htm#INDEX-5527">32.1.6. Internationalization and Locale</a></dt>
<a name="utf8-Perl-version">
<dt>Perl version: <a href="../ch15_01.htm#INDEX-2813">15.1. Building Character</a></dt>
<a name="utf8-pragma">
<dt>pragma: <a href="../ch15_02.htm#INDEX-2826">15.2. Effects of Character Semantics</a></dt>
<a name="utf8-strings-converting-to-from-byte-strings">
<dt>strings, converting to/from byte strings: <a href="../ch15_01.htm#INDEX-2821">15.1. Building Character</a></dt>
 <a name="variable-length-character-encoding">
  <dt>variable-length character encoding: <a href="../ch15_01.htm#INDEX-2809">15.1. Building Character</a></dt>
</dl></dd>

<a name="utime-function">
<dt>utime function: <a href="../ch29_02.htm#INDEX-5388">29.2.193. utime</a></dt>
<a name="utmp-file">
<dt>utmp file (see <a href="idx_e.htm#-etc-utmp-file">/etc/utmp file</a>)
</dt>
<a name="UV-internal-unsigned-integer-value">
<dt>UV (internal unsigned integer value): <a href="../ch21_02.htm#INDEX-3684">21.2. Internal Data Types</a></dt>
</dl>

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