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<HTML><HEAD><TITLE>Index</TITLE></HEAD><BODY BGCOLOR="#FFFFFF" TEXT="#000000"><P><A HREF="../index.htm"><IMG SRC="../gifs/smbanns.gif" ALT="Book Home" BORDER=0></A><P><FONT SIZE="-1"><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>| W| <A HREF="idx_x.htm">X</A>| <A HREF="idx_y.htm">Y</A>| <A HREF="idx_z.htm">Z</A></FONT><H1>Index: W</H1><DL><DT><A NAME="wait-command">wait command</A>: <A HREF="../ch38_16.htm">38.16. Why You Can't Kill a Zombie </A><DD><DL> <DT>in background jobs: <A HREF="../ch44_07.htm">44.7. Exit Status of UNIX Processes </A></DL><DT><A NAME="wallclock-time">wallclock time</A><DD><DL> <DT><A HREF="../ch39_03.htm">39.3. The csh time variable </A> <DT><A HREF="../ch39_05.htm">39.5. Why Is the System So Slow? </A></DL><DT><A NAME="watch-command-vs.2e-vis-command">watch command vs. vis command</A>: <A HREF="../ch51_07.htm">51.7. When You Get Impatient </A><DT><A NAME="watchq-script">watchq script</A><DD><DL> <DT><A HREF="../ch38_11.htm">38.11. Printer Queue Watcher: A Restartable Daemon Shell Script</A> <DT><A HREF="../ch52_04.htm">52.4. Quick Descriptions of What's on the Disc </A></DL><DT><A NAME="wc-command">wc command</A><DD><DL> <DT><A HREF="../ch08_06.htm#UPT-ART-7911-SECT-1.1">8.6.1. Portability </A> <DT><A HREF="../ch29_06.htm">29.6. Counting Lines, Words, and Characters: wc </A></DL><DT><A NAME="web">Web, described</A>: <A HREF="../ch01_33.htm">1.33. UNIX Networking and Communications </A><DT><A NAME="weekday-in-crontab-entries">weekday in crontab entries</A>: <A HREF="../ch40_12.htm#UPT-ART-5410-SECT-1.1">40.12.1. Execution Scheduling </A><DT><A NAME="werase-key">werase key</A>: <A HREF="../ch05_09.htm">5.9. Setting Your Erase, Kill, and Interrupt Characters </A><DT><A NAME="whatis-command">whatis command</A>: <A HREF="../ch50_04.htm">50.4. whatis: One-Line Command Summaries </A><DD><DL> <DT>advantages: <A HREF="../ch50_04.htm">50.4. whatis: One-Line Command Summaries </A> <DT>apropos compared to: <A HREF="../ch50_04.htm">50.4. whatis: One-Line Command Summaries </A> <DT>examples: <A HREF="../ch50_04.htm">50.4. whatis: One-Line Command Summaries </A></DL><DT><A NAME="whence-command">whence command</A>: <A HREF="../ch04_10.htm">4.10. Find All Command Versions with whereiz </A><DT><A NAME="whereis-command">whereis command</A><DD><DL> <DT><A HREF="../ch16_10.htm">16.10. findcmd: Find a Command in Your Search Path </A> <DT><A HREF="../ch50_05.htm">50.5. whereis: Finding Where a Command Is Located </A> <DT>-b option: <A HREF="../ch50_05.htm">50.5. whereis: Finding Where a Command Is Located </A> <DT>examples <DD><DL> <DT><A HREF="../ch44_21.htm">44.21. Picking a Name for a New Command </A> <DT><A HREF="../ch50_05.htm">50.5. whereis: Finding Where a Command Is Located </A> </DL> <DT>-m option: <A HREF="../ch50_05.htm">50.5. whereis: Finding Where a Command Is Located </A> <DT>-s option: <A HREF="../ch50_05.htm">50.5. whereis: Finding Where a Command Is Located </A> <DT>-u option: <A HREF="../ch50_05.htm">50.5. whereis: Finding Where a Command Is Located </A></DL><DT><A NAME="whereiz-script">whereiz script</A><DD><DL> <DT><A HREF="../ch04_10.htm">4.10. Find All Command Versions with whereiz </A> <DT><A HREF="../ch52_04.htm">52.4. Quick Descriptions of What's on the Disc </A></DL><DT><A NAME="which-command">which command</A><DD><DL> <DT><A HREF="../ch16_10.htm">16.10. findcmd: Find a Command in Your Search Path </A> <DT><A HREF="../ch50_08.htm">50.8. Which Version Am I Using? </A> <DT>-a option: <A HREF="../ch04_10.htm">4.10. Find All Command Versions with whereiz </A> <DT>alternatives to: <A HREF="../ch50_08.htm">50.8. Which Version Am I Using? </A> <DT>examples <DD><DL> <DT><A HREF="../ch44_21.htm">44.21. Picking a Name for a New Command </A> <DT><A HREF="../ch50_08.htm">50.8. Which Version Am I Using? </A> </DL> <DT>setting the prompt variable: <A HREF="../ch02_10.htm">2.10. Gotchas in set prompt Test </A></DL><DT><A NAME="which-program">which program</A>: <A HREF="../ch52_04.htm">52.4. Quick Descriptions of What's on the Disc </A><DT><A NAME="while-command">while command (awk)</A>: <A HREF="../ch33_11.htm#UPT-ART-2860-SECT-1.7">33.11.7. Alphabetical Summary of Commands </A><DT><A NAME="while-loops">while loops</A><DD><DL> <DT><A HREF="../ch44_10.htm#UPT-ART-2280-SECT-1.2">44.10.2. Looping Until a Command Fails </A> <DT><A HREF="../ch44_15.htm#UPT-ART-7130-SECT-1.2">44.15.2. With a Loop </A> <DT>in C shell: <A HREF="../ch47_04.htm#UPT-ART-7650-SECT-1.2">47.4.2. Expressions </A> <DT>case statement used in: <A HREF="../ch45_22.htm">45.22. Handling Files Line-by-Line </A> <DT>case statement used with: <A HREF="../ch44_17.htm">44.17. Handling Arguments with while and shift </A> <DT>examples <DD><DL> <DT><A HREF="../ch44_10.htm#UPT-ART-2280-SECT-1.2">44.10.2. Looping Until a Command Fails </A> <DT><A HREF="../ch44_17.htm">44.17. Handling Arguments with while and shift </A> <DT><A HREF="../ch45_32.htm">45.32. A Better read Command: grabchars </A> </DL> <DT>for loops compared to: <A HREF="../ch45_16.htm">45.16. Standard Input to a for Loop </A> <DT>handling command-line arguments: <A HREF="../ch44_17.htm">44.17. Handling Arguments with while and shift </A> <DT>jot command in: <A HREF="../ch45_11.htm">45.11. The Multipurpose jot Command </A> <DT>multiple commands: <A HREF="../ch45_19.htm">45.19. A while Loop with Several Loop Control Commands </A> <DT>read command used in <DD><DL> <DT><A HREF="../ch45_16.htm">45.16. Standard Input to a for Loop </A> <DT><A HREF="../ch45_22.htm">45.22. Handling Files Line-by-Line </A> </DL> <DT>redirected: <A HREF="../ch45_22.htm">45.22. Handling Files Line-by-Line </A> <DT>shift command used with: <A HREF="../ch44_17.htm">44.17. Handling Arguments with while and shift </A> <DT>test command used with: <A HREF="../ch44_17.htm">44.17. Handling Arguments with while and shift </A> <DT>until loops compared to: <A HREF="../ch44_10.htm#UPT-ART-2280-SECT-1.2">44.10.2. Looping Until a Command Fails </A></DL><DT><A NAME="whitespace">whitespace</A>: <A HREF="../ch01_02.htm">1.2. Who Listens to What You Type? </A><DD><DL> <DT>adding or deleting: <A HREF="../ch25_09.htm">25.9. Adding and Deleting White Space </A> <DT>adding/deleting: <A HREF="../ch25_13.htm">25.13. pushin: Squeeze Out Extra White Space </A> <DT>cat command and: <A HREF="../ch25_06.htm">25.6. What's in That White Space? </A> <DT>double-spacing: <A HREF="../ch25_12.htm">25.12. Double Space, Triple Space ... </A> <DT>in filenames <DD><DL> <DT><A HREF="../ch08_16.htm">8.16. Quoting Handles Special Characters in Filenames </A> <DT><A HREF="../ch16_13.htm">16.13. Can't Access a File? Look for Spaces in the Name </A> </DL> <DT>newline character: <A HREF="../ch01_29.htm">1.29. When Is a File Not a File? </A> <DT>newline characters <DD><DL> <DT><A HREF="../ch04_09.htm">4.9. Setting Up vi with the .exrc File </A> <DT><A HREF="../ch08_06.htm#UPT-ART-7911-SECT-1.1">8.6.1. Portability </A> <DT><A HREF="../ch25_10.htm">25.10. Squash Extra Blank Lines </A> </DL> <DT>problems with xargs: <A HREF="../ch09_22.htm">9.22. xargs: Problems with Spaces and Newlines </A> <DT>TAB characters <DD><DL> <DT><A HREF="../ch08_18.htm">8.18. Here Documents </A> <DT><A HREF="../ch24_06.htm">24.6. Save Space with Tab Characters </A> </DL> <DT>wc command and: <A HREF="../ch29_06.htm">29.6. Counting Lines, Words, and Characters: wc </A></DL><DT><A NAME=".22who-are-you.3f.22-error-message">"who are you?" error message</A>: <A HREF="../ch50_12.htm">50.12. Common UNIX Error Messages </A><DT><A NAME="who-command">who command</A><DD><DL> <DT><A HREF="../ch09_16.htm">9.16. Command Substitution </A> <DT><A HREF="../ch51_04.htm">51.4. Who's On? </A> <DT><A HREF="../ch52_04.htm">52.4. Quick Descriptions of What's on the Disc </A> <DT>examples: <A HREF="../ch44_02.htm">44.2. Writing a Simple Shell Program </A> <DT>on PowerTools disk: <A HREF="../ch51_04.htm">51.4. Who's On? </A></DL><DT><A NAME="whoami-command">whoami command</A>: <A HREF="../ch02_12.htm">2.12. Automatic Setups for Different Terminals </A><DD><DL> <DT>errors caused by: <A HREF="../ch50_12.htm">50.12. Common UNIX Error Messages </A></DL><DT><A NAME="wildcard-characters">wildcard characters</A><DD><DL> <DT>in case statements⌨️ 快捷键说明
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