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<html><head><title>Index: R</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" ></p><map name="banner-map"><AREA SHAPE="RECT" COORDS="0,0,466,71" HREF="../index.htm" ALT="Programming Perl"><AREA SHAPE="RECT" COORDS="467,0,514,18" HREF="../jobjects/fsearch.htm" ALT="Search this book"></map><!-- TOP INDEX LINKS --><p><a href="idx_0.htm">Symbols</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 --><H1>Index: R</H1><DL><a name="-r-readable-by-effective-uid-gid-file-test"><dt>-r (readable by effective uid/gid) file test: <a href="../ch01_05.htm#INDEX-271">1.5.7. Some File Test Operators</a></dt><dd><dl> <dt><a href="../ch03_10.htm#INDEX-891">3.10. Named Unary and File Test Operators</a></dt></dl></dd><a name="-R-readable-by-real-uid-gid-file-test"><dt>-R (readable by real uid/gid file test: <a href="../ch03_10.htm#INDEX-895">3.10. Named Unary and File Test Operators</a></dt><a name="race-conditions"><dt>race conditions</dt><dd><dl> <a name="file-locking-and"> <dt>file locking and: <a href="../ch16_02.htm#INDEX-2955">16.2.1. File Locking</a></dt> <a name="handling"> <dt>handling: <a href="../ch23_02.htm#INDEX-4032">23.2.2. Handling Race Conditions</a></dt></dl></dd><a name="rand-function"><dt>rand function: <a href="../ch03_01.htm#INDEX-807">3.1. Terms and List Operators (Leftward)</a></dt><dd><dl> <dt><a href="../ch29_02.htm#INDEX-5134">29.2.119. rand</a></dt></dl></dd><a name="random-numbers"><dt>random numbers: <a href="../ch29_02.htm#INDEX-5135">29.2.119. rand</a></dt><dd><dl> <dt><a href="../ch29_02.htm#INDEX-5277">29.2.164. srand</a></dt> <a name="producing-as-handles-or-scalars"> <dt>producing as handles or scalars: <a href="../ch14_04.htm#INDEX-2753">14.4.2. Creative Filehandles</a></dt></dl></dd><a name="range-..-and-...-operator"><dt>range (.. and ...) operator: <a href="../ch03_15.htm#INDEX-974">3.15. Range Operator</a></dt><a name="ranges"><dt>ranges</dt><dd><dl> <a name="character-sets-specifying-in"> <dt>character sets, specifying in: <a href="../ch05_02.htm#INDEX-1439">5.2.4. The tr/// Operator (Transliteration)</a></dt> <a name="characters"> <dt>characters: <a href="../ch05_04.htm#INDEX-1533">5.4.1. Custom Character Classes</a></dt></dl></dd><a name="$rdev-file-statistic"><dt>$rdev file statistic: <a href="../ch29_02.htm#INDEX-5294">29.2.165. stat</a></dt><a name="re-initialization-expressions-loops"><dt>re-initialization expressions, loops: <a href="../ch04_04.htm#INDEX-1087">4.4.2. for Loops</a></dt><a name="re-module"><dt>re module: <a href="../ch32_01.htm#INDEX-5646">32.1.13. Perl Language Extensions and Internals</a></dt><a name="read-function"><dt>read function: <a href="../ch14_04.htm#INDEX-">14.4.1. Filehandle-Tying Methods</a></dt><dd><dl> <dt><a href="../ch29_02.htm#INDEX-5138">29.2.120. read</a></dt></dl></dd><a name="readable-file-test-operator"><dt>readable file test operator: <a href="../ch01_05.htm#INDEX-272">1.5.7. Some File Test Operators</a></dt><dd><dl> <dt><a href="../ch03_10.htm#INDEX-914">3.10. Named Unary and File Test Operators</a></dt></dl></dd><a name="readdir-function"><dt>readdir function: <a href="../ch29_02.htm#INDEX-5142">29.2.121. readdir</a></dt><a name="reading"><dt>reading</dt><dd><dl> <a name="data-via-low-level-system-call"> <dt>data via low-level system call: <a href="../ch29_02.htm#INDEX-5324">29.2.172. sysread</a></dt> <a name="shared-memory-segment-ID"> <dt>shared memory segment ID: <a href="../ch29_02.htm#INDEX-5229">29.2.152. shmread</a></dt></dl></dd><a name="reading-files"><dt>reading files</dt><dd><dl> <a name="open-mode-and"> <dt>open mode and: <a href="../ch29_02.htm#INDEX-5055">29.2.104. open</a></dt></dl></dd><a name="readline-function"><dt>readline function: <a href="../ch02_11.htm#INDEX-750">2.11.2. Line Input (Angle) Operator</a></dt><a name="READLINE-method"><dt>READLINE method: <a href="../ch14_04.htm#INDEX-">14.4.1. Filehandle-Tying Methods</a></dt><a name="ReadLine-module-disabling-support-to-debugger"><dt>ReadLine module, disabling support to debugger: <a href="../ch20_04.htm#INDEX-3643">20.4. Unattended Execution</a></dt><a name="readline-packages"><dt>readline packages: <a href="../ch32_01.htm#INDEX-5605">32.1.11. User Interfaces</a></dt><a name="readlink-function"><dt>readlink function: <a href="../ch29_02.htm#INDEX-5144">29.2.123. readlink</a></dt><a name="ready-file-descriptors"><dt>ready file descriptors: <a href="../ch29_02.htm#INDEX-5197">29.2.141. select (ready file descriptors)</a></dt><a name="real-GID"><dt>real GID (see <a href="idx_$.htm#$-variable">$( variable</a>)</dt><a name="real-UID"><dt>real UID (see <a href="idx_$.htm#$<-variable">$< variable</a>)</dt><a name="real-values-testing-for-with-defined-function"><dt>real values, testing for with defined function: <a href="../ch29_02.htm#INDEX-4717">29.2.23. defined</a></dt><a name="$REAL_GROUP_ID"><dt>$REAL_GROUP_ID: <a href="../ch28_02.htm#INDEX-4575">28.2. Special Variables in Alphabetical Order</a></dt><a name="$REAL_USER_ID"><dt>$REAL_USER_ID: <a href="../ch28_02.htm#INDEX-4579">28.2. Special Variables in Alphabetical Order</a></dt><a name="reaping-zombie-processes"><dt>reaping zombie processes: <a href="../ch16_01.htm#INDEX-2930">16.1.2. Reaping Zombies</a></dt><dd><dl> <a name="servers"> <dt>servers: <a href="../ch16_05.htm#INDEX-3101">16.5.2. Networking Servers</a></dt></dl></dd><a name="recallCommand-option-debugger"><dt>recallCommand option (debugger): <a href="../ch20_03.htm#INDEX-3600">20.3.3. Debugger Options</a></dt><a name="recompiling-patterns-limiting-with--o-modifier"><dt>recompiling patterns, limiting with /o modifier: <a href="../ch05_02.htm#INDEX-1354">5.2.1. Pattern Modifiers</a></dt><a name="record-delimiter"><dt>record delimiter (see <a href="idx_$.htm#$--variable">$/ variable</a>)</dt><a name="record-mode"><dt>record mode: <a href="../ch28_02.htm#INDEX-4507">28.2. Special Variables in Alphabetical Order</a></dt><a name="records"><dt>records</dt><dd><dl> <a name="functions-dealing-with"> <dt>functions dealing with: <a href="../ch29_01.htm#INDEX-">29.1. Perl Functions by Category</a></dt> <a name="input-separator-for"> <dt>input, separator for (see <a href="idx_$.htm#$--variable">$/ variable</a>)</dt> <a name="output-separator-for"> <dt>output, separator for (see <a href="idx_$.htm#$--variable">$\ variable</a>)</dt> <a name="of-various-data-structures"> <dt>of various data structures: <a href="../ch09_06.htm#INDEX-2161">9.6. More Elaborate Records</a></dt><dd><dl> <a name="composing-accessing-and-printing"> <dt>composing, accessing, and printing: <a href="../ch09_06.htm#INDEX-2164">9.6.1. Composition, Access, and Printing of More Elaborate Records</a></dt> <a name="generating-hash-of"> <dt>generating hash of: <a href="../ch09_06.htm#INDEX-2168">9.6.3. Generation of a Hash of Complex Records</a></dt> </dl></dd></dl></dd><a name="records-variable-length"><dt>records, variable-length: <a href="../ch07_01.htm#INDEX-1903">7. Formats</a></dt><a name="recursion-of-subroutines"><dt>recursion of subroutines: <a href="../ch06_02.htm#INDEX-1828">6.2.3. Scoping Issues</a></dt><a name="recursive-lexical-pad-stacks"><dt>recursive lexical pad stacks: <a href="../ch18_03.htm#INDEX-">18.3. Executing Your Code</a></dt><a name="recursive-matching"><dt>recursive matching: <a href="../ch05_10.htm#INDEX-1770">5.10.3.4. Match-time pattern interpolation</a></dt><a name="recursivity"><dt>recursivity, <a name="locks"> locks: <a href="../ch17_02.htm#INDEX-3183">17.2.2.1. Synchronizing access with lock</a></dt><a name="recv-function"><dt>recv function: <a href="../ch29_02.htm#INDEX-5149">29.2.125. recv</a></dt><a name="redo-operator"><dt>redo operator: <a href="../ch04_04.htm#INDEX-1117">4.4.4. Loop Control</a></dt><dd><dl> <dt><a href="../ch04_04.htm#INDEX-1128">4.4.4. Loop Control</a></dt> <dt><a href="../ch29_02.htm#INDEX-5152">29.2.126. redo</a></dt></dl></dd><a name="redundancy-in-Perl"><dt>redundancy in Perl: <a href="../ch01_05.htm#INDEX-265">1.5.6. Some Numeric and String Comparison Operators</a></dt><a name="ref-function"><dt>ref function: <a href="../ch12_04.htm#INDEX-2410">12.4. Object Construction</a></dt><dd><dl> <dt><a href="../ch29_02.htm#INDEX-5154">29.2.127. ref</a></dt></dl></dd><a name="ref-operator"><dt>ref operator: <a href="../ch08_03.htm#INDEX-2022">8.3.6. Other Tricks You Can Do with Hard References</a></dt><a name="references"><dt>references: <a href="../ch01_02.htm#INDEX-59">1.2.1.1. Singularities</a></dt><dd><dl> <dt><a href="../ch08_01.htm#INDEX-1948">8. References</a></dt> <a name="to-anonymous-data"> <dt>to anonymous data: <a href="../ch08_02.htm#INDEX-1978">8.2.2. Anonymous Data</a></dt> <a name="blessing"> <dt>blessing: <a href="../ch12_04.htm#INDEX-2409">12.4. Object Construction</a></dt> <a name="braces-brackets-and-quoting-in"> <dt>braces, brackets and quoting in: <a href="../ch08_05.htm#INDEX-2053">8.5. Braces, Brackets, and Quoting</a></dt> <a name="casting-to-other-pointer-types"> <dt>casting to other pointer types: <a href="../ch02_06.htm#INDEX-535">2.6. Scalar Values</a></dt> <a name="checking-for"> <dt>checking for: <a href="../ch29_02.htm#INDEX-5155">29.2.127. ref</a></dt> <a name="circular"> <dt>circular, <a name="in-overloading"> in overloading: <a href="../ch13_03.htm#INDEX-2623">13.3. Overloadable Operators</a></dt> <a name="circular-and-memory"> <dt>circular, and memory: <a href="../ch08_05.htm#INDEX-2068">8.5.2. Garbage Collection, Circular References, and Weak References</a></dt> <a name="creating"> <dt>creating: <a href="../ch08_02.htm#INDEX-1974">8.2. Creating References</a></dt><dd><dl> <a name="with-backslash-operator"> <dt>with backslash operator: <a href="../ch08_02.htm#INDEX-1977">8.2.1. The Backslash Operator</a></dt> </dl></dd> <a name="to-data-structures"> <dt>to data structures: <a href="../ch08_01.htm#INDEX-1969">8.1. What Is a Reference?</a></dt> <a name="defining"> <dt>defining: <a href="../ch08_01.htm#INDEX-1953">8.1. What Is a Reference?</a></dt> <a name="destruction-of-controlling"> <dt>destruction of, controlling: <a href="../ch19_02.htm#INDEX-3495">19.2. Environment Variables</a></dt> <a name="to-filehandles"> <dt>to filehandles: <a href="../ch08_02.htm#INDEX-1997">8.2.4. Handle References</a></dt><dd><dl> <dt><a href="../ch29_02.htm#INDEX-5044">29.2.104. open</a></dt> </dl></dd> <a name="to-functions"> <dt>to functions, <a name="storing-in-data-structures"> storing in data structures: <a href="../ch09_05.htm#INDEX-2159">9.5. Hashes of Functions</a></dt> <a name="hard"> <dt>hard: <a href="../ch03_02.htm#INDEX-813">3.2. The Arrow Operator</a></dt><dd><dl> <dt>(see also <a href="idx_h.htm#hard-references">hard references</a>)</dt> </dl></dd> <a name="hash-keys-providing-as"> <dt>hash keys, providing as: <a href="../ch32_01.htm#INDEX-5661">32.1.14. Convenient Classes</a></dt> <a name="indirection"> <dt>indirection: <a href="../ch08_01.htm#INDEX-1952">8. References</a></dt> <a name="locking"> <dt>locking: <a href="../ch17_02.htm#INDEX-3181">17.2.2.1. Synchronizing access with lock</a></dt> <a name="in-multidimsional-arrays"> <dt>in multidimsional arrays: <a href="../ch09_01.htm#INDEX-2088">9.1.1. Creating and Accessing a Two-Dimensional Array</a></dt> <a name="object-oriented-programming-and"> <dt>object-oriented programming and: <a href="../ch10_01.htm#INDEX-2196">10. Packages</a></dt> <a name="for-objects"> <dt>for objects: <a href="../ch12_02.htm#INDEX-2357">12.2. Perl's Object System</a></dt> <a name="objects-as"> <dt>objects as: <a href="../ch12_04.htm#INDEX-2403">12.4. Object Construction</a></dt> <a name="passing"> <dt>passing: <a href="../ch06_03.htm#INDEX-1839">6.3. Passing References</a></dt>⌨️ 快捷键说明
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