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<html><head><title>Index: Symbols & Numbers</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: Symbols & Numbers</H2><DL><!-- ========================== --><a name="---autodecrement-operator"><dt>-- autodecrement operator: <a href="../ch10_06.htm#INDEX-665">10.6. Autoincrement and Autodecrement</a></dt><!-- ========================== --><a name="`-`-backquotes-backticks"><dt>` ` backquotes/backticks: <a href="../ch01_05.htm#INDEX-104">1.5. A Whirlwind Tour of Perl</a></dt><dd><dl> <dt><a href="../ch14_04.htm#INDEX-961">14.4. Using Backquotes to Capture Output</a></dt></dl></dd><!-- ========================== --><a name="{-}-curly-braces"><dt>{ } curly braces (see <a href="idx_c.htm#curly-braces">curly braces</a>)</dt><!-- ========================== --><a name="--hyphen"><dt>- hyphen: <a href="../ch06_02.htm#INDEX-437">6.2. Input from the Diamond Operator</a></dt><dd><dl> <dt><a href="../ch08_01.htm#INDEX-526">8.1. Character Classes</a></dt></dl></dd><!-- ========================== --><a name="--parentheses"><dt>( ) parentheses (see <a href="idx_p.htm#parentheses">parentheses</a>)</dt><!-- ========================== --><a name="'-'-single-quotes"><dt>' ' single quotes: <a href="../ch02_03.htm#INDEX-150">2.3.1. Single-Quoted String Literals</a></dt><!-- ========================== --><a name="[-]-square-brackets"><dt>[ ] square brackets: <a href="../ch07_03.htm#INDEX-518">7.3. A Pattern Test Program</a></dt><dd><dl> <dt><a href="../ch08_01.htm#INDEX-524">8.1. Character Classes</a></dt></dl></dd><!-- ========================== --><a name="--subtraction-operator"><dt>- subtraction operator: <a href="../ch02_02.htm#INDEX-132">2.2.5. Numeric Operators</a></dt><!-- ========================== --><a name="+-addition-operator"><dt>+ addition operator: <a href="../ch02_02.htm#INDEX-130">2.2.5. Numeric Operators</a></dt><!-- ========================== --><a name=".=-append-operator"><dt>.= append operator: <a href="../ch02_05.htm#INDEX-193">2.5.3. Binary Assignment Operators</a></dt><!-- ========================== --><a name="@_-array-variable"><dt>@_ array variable: <a href="../ch04_05.htm#INDEX-331">4.5. Arguments</a></dt><!-- ========================== --><a name="=-assignment-operator"><dt>= assignment operator: <a href="../ch02_05.htm#INDEX-187">2.5.2. Scalar Assignment</a></dt><!-- ========================== --><a name="@-at-sign"><dt>@ at-sign: <a href="../ch03_04.htm#INDEX-279">3.4. List Assignment</a></dt><!-- ========================== --><a name="++-autoincrement-operator"><dt>++ autoincrement operator: <a href="../ch10_06.htm#INDEX-663">10.6. Autoincrement and Autodecrement</a></dt><!-- ========================== --><a name="-----backslash"><dt>\\\\ backslash: <a href="../ch02_03.htm#INDEX-152">2.3.1. Single-Quoted String Literals</a></dt><dd><dl> <dt><a href="../ch08_04.htm#INDEX-559">8.4.1. Backreferences</a></dt></dl></dd><!-- ========================== --><a name="=~-binding-operator"><dt>=~ binding operator: <a href="../ch09_03.htm#INDEX-589">9.3. The Binding Operator, =~</a></dt><!-- ========================== --><a name="^-caret-anchor"><dt>^ caret anchor: <a href="../ch08_03.htm#INDEX-547">8.3. Anchors</a></dt><!-- ========================== --><a name="-comma"><dt>, comma: <a href="../ch05_02.htm#INDEX-399">5.2.3. The Big Arrow</a></dt><!-- ========================== --><a name="$_-default-variable"><dt>$_ default variable (see <a href="idx_d.htm#default-variable">default variable</a>)</dt><!-- ========================== --><a name="--division-operator"><dt>/ division operator: <a href="../ch02_02.htm#INDEX-136">2.2.5. Numeric Operators</a></dt><!-- ========================== --><a name="$-dollar-sign"><dt>$ dollar sign (see <a href="idx_d.htm#dollar-sign">dollar sign</a>)</dt><!-- ========================== --><a name=".-dot"><dt>. dot (see <a href="idx_d.htm#dot">dot</a>)</dt><!-- ========================== --><a name=".--dot-and-slash"><dt>./ dot and slash: <a href="../ch01_04.htm#INDEX-75">1.4.1. A Simple Program</a></dt><!-- ========================== --><a name="..-dot-dot"><dt>.. dot-dot: <a href="../ch13_03.htm#INDEX-892">13.3. Links and Files</a></dt><!-- ========================== --><a name="-e-command-line-option"><dt>-e command-line option: <a href="../ch16_04.htm#INDEX-1078">16.4.1. In-place Editing from the Command Line</a></dt><!-- ========================== --><a name="-eval-option-find2perl-command-and"><dt>-eval option, find2perl command and: <a href="../appb_26.htm#INDEX-1316"> B.26. Converting find Command Lines to Perl</a></dt><!-- ========================== --><a name="**-exponentiation-operator"><dt>** exponentiation operator: <a href="../ch02_02.htm#INDEX-140">2.2.5. Numeric Operators</a></dt><!-- ========================== --><a name="_-_FILE_-_-and-_-_LINE_-_-tokens"><dt>_ _FILE_ _ and _ _LINE_ _ tokens: <a href="../ch11_03.htm#INDEX-771">11.3. Fatal Errors with die</a></dt><!-- ========================== --><a name="_-filehandle"><dt>_ filehandle: <a href="../ch11_06.htm#INDEX-842">11.6.5. Using the Special Underscore Filehandle</a></dt><!-- ========================== --><a name="->-little-arrow"><dt>-> little arrow: <a href="../ch05_02.htm#INDEX-397">5.2.3. The Big Arrow</a></dt><dd><dl> <dt><a href="../ch13_08.htm#INDEX-942">13.8.3. The File::Spec Module</a></dt></dl></dd><!-- ========================== --><a name="-i.bak-command-line-option"><dt>-i.bak command-line option: <a href="../ch16_04.htm#INDEX-1076">16.4.1. In-place Editing from the Command Line</a></dt><!-- ========================== --><a name="#!-line"><dt>#! line: <a href="../ch01_04.htm#INDEX-83">1.4.2. What's Inside That Program?</a></dt><dd><dl> <dt><a href="../ch01_05.htm#INDEX-103">1.5. A Whirlwind Tour of Perl</a></dt></dl></dd><!-- ========================== --><a name="%-modulus-operator"><dt>% modulus operator: <a href="../ch02_02.htm#INDEX-138">2.2.5. Numeric Operators</a></dt><dd><dl> <dt><a href="../ch17_02.htm#INDEX-1091">17.2. Picking Items from a List with grep</a></dt></dl></dd><!-- ========================== --><a name="*-multiplication-operator"><dt>* multiplication operator: <a href="../ch02_02.htm#INDEX-134">2.2.5. Numeric Operators</a></dt><!-- ========================== --><a name="-n-command-line-option"><dt>-n command-line option: <a href="../ch16_04.htm#INDEX-1075">16.4.1. In-place Editing from the Command Line</a></dt><!-- ========================== --><a name="!-negation-operator"><dt>! negation operator (see <a href="idx_n.htm#negation-operator">negation operator</a>)</dt><!-- ========================== --><a name=".-operator"><dt>. operator: <a href="../ch02_03.htm#INDEX-164">2.3.3. String Operators</a></dt><!-- ========================== --><a name="-p-command-line-option"><dt>-p command-line option: <a href="../ch16_04.htm#INDEX-1074">16.4.1. In-place Editing from the Command Line</a></dt><!-- ========================== --><a name="%-percent-sign"><dt>% percent sign (see <a href="idx_p.htm#percent-sign">percent sign</a>)</dt><!-- ========================== --><a name="|-pipe"><dt>| pipe: <a href="../ch11_01.htm#INDEX-738">11.1. What Is a Filehandle?</a></dt><dd><dl> <dt><a href="../ch14_05.htm#INDEX-975">14.5. Processes as Filehandles</a></dt></dl></dd><!-- ========================== --><a name="+-plus-sign"><dt>+ plus sign: <a href="../ch07_02.htm#INDEX-510">7.2.2. Simple Quantifiers</a></dt><!-- ========================== --><a name="#-pound-sign"><dt># pound sign: <a href="../ch01_04.htm#INDEX-80">1.4.2. What's Inside That Program?</a></dt><!-- ========================== --><a name="?-question-mark"><dt>? question mark: <a href="../ch07_02.htm#INDEX-512">7.2.2. Simple Quantifiers</a></dt><!-- ========================== --><a name="**=-raise-to-the-power-of-operator"><dt>**= raise to the power of operator: <a href="../ch02_05.htm#INDEX-195">2.5.3. Binary Assignment Operators</a></dt><!-- ========================== --><a name="..-range-operator"><dt>.. range operator: <a href="../ch03_03.htm#INDEX-269">3.3. List Literals</a></dt><!-- ========================== --><a name=";-semicolon"><dt>; semicolon (see <a href="idx_s.htm#semicolon">semicolon</a>)</dt><!-- ========================== --><a name="*-star"><dt>* star: <a href="../ch07_02.htm#INDEX-507">7.2.2. Simple Quantifiers</a></dt><!-- ========================== --><a name=".-string-concatenate-operator"><dt>. string concatenate operator: <a href="../ch02_05.htm#INDEX-191">2.5.3. Binary Assignment Operators</a></dt><!-- ========================== --><a name="?-:-ternary-operator"><dt>?\: ternary operator: <a href="../ch10_09.htm#INDEX-712">10.9.2. The Ternary Operator, ?:</a></dt><!-- ========================== --><a name="~-tilde"><dt>~ tilde: <a href="../ch16_04.htm#INDEX-1069">16.4. Variable-length (Text) Databases</a></dt><!-- ========================== --><a name="~-tilde-prefix"><dt>~ tilde-prefix: <a href="../ch12_01.htm#INDEX-852">12.1. Moving Around the Directory Tree</a></dt><!-- ========================== --><a name="_-underscore"><dt>_ underscore: <a href="../ch02_02.htm#INDEX-122">2.2.3. Integer Literals</a></dt><dd><dl> <dt><a href="../ch04_10.htm#INDEX-360">4.10. The use strict Pragma</a></dt></dl></dd><!-- ========================== --><a name="$!-variable"><dt>$! variable: <a href="../ch11_03.htm#INDEX-764">11.3. Fatal Errors with die</a></dt><!-- ========================== --><a name="--|-vertical-bar"><dt>\\| vertical bar: <a href="../ch07_02.htm#INDEX-515">7.2.4. Alternatives</a></dt><!-- ========================== --><a name="-w-option"><dt>-w option: <a href="../ch02_04.htm#INDEX-172">2.4. Perl's Built-in Warnings</a></dt><dd><dl> <dt><a href="../ch16_04.htm#INDEX-1077">16.4.1. In-place Editing from the Command Line</a></dt> <a name="vs.-warnings-pragma"> <dt>vs. warnings pragma: <a href="../appb_06.htm#INDEX-1190"> B.6.6. The warnings Pragma</a></dt> </dl></dd><!-- ========================== --><a name="&-ampersand"><dt>& ampersand: <a href="../ch04_03.htm#INDEX-320">4.3. Invoking a Subroutine</a></dt><dd><dl> <dt><a href="../ch04_11.htm#INDEX-363">4.11.1. Omitting the Ampersand</a></dt>⌨️ 快捷键说明
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