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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>| D| <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><H1>Index: D</H1><DL><DT><A NAME="daemons">daemons</A>: <A HREF="../ch01_14.htm">1.14. The Kernel and Daemons </A><DD><DL> <DT>controlling terminal and: <A HREF="../ch38_06.htm">38.6. The Controlling Terminal </A> <DT>restarting with the kill command: <A HREF="../ch38_11.htm">38.11. Printer Queue Watcher: A Restartable Daemon Shell Script</A></DL><DT><A NAME="dashes">dashes</A>: (see <A HREF="idx_0.htm#.2d">- (hyphen)</A>)<DT><A NAME="databases">databases</A><DD><DL> <DT>created using awk: <A HREF="../ch48_10.htm">48.10. Working with Names and Addresses </A> <DT>index program for creating: <A HREF="../ch48_11.htm">48.11. The index Database Program </A> <DT>searching: <A HREF="../ch17_19.htm">17.19. Finding Files (Much) Faster with a find Database </A></DL><DT><A NAME="date">date</A>: (see <A HREF="idx_t.htm#time">time</A>)<DT><A NAME="date-command">date command</A><DD><DL> <DT><A HREF="../ch07_12.htm">7.12. External Commands Send Signals to Set Variables </A> <DT><A HREF="../ch16_16.htm">16.16. Picking a Unique Filename Automatically </A> <DT><A HREF="../ch21_14.htm">21.14. Automatically Appending the Date to a Filename </A> <DT><A HREF="../ch51_10.htm">51.10. The date Command </A> <DT><A HREF="../ch52_04.htm">52.4. Quick Descriptions of What's on the Disc </A> <DT>cal program using: <A HREF="../ch48_07.htm">48.7. cal That Marks Today's Date </A> <DT>examples: <A HREF="../ch51_10.htm">51.10. The date Command </A></DL><DT><A NAME="day.2dof.2dmonth-in-crontab-entries">day-of-month in crontab entries</A>: <A HREF="../ch40_12.htm#UPT-ART-5410-SECT-1.1">40.12.1. Execution Scheduling </A><DT><A NAME="dbm-files">dbm files</A>: <A HREF="../ch24_18.htm">24.18. Huge Files Might Not Take a Lot of Disk Space </A><DT><A NAME="dc-program">dc program</A><DD><DL> <DT><A HREF="../ch49_01.htm#UPT-ART-3920">49.1. bc: Simple Math at the Shell Prompt </A> <DT>(see also <A HREF="idx_c.htm#calculators">calculators</A>)</DL><DT><A NAME="dcl">DCL</A>: (see <A HREF="idx_v.htm#vax.2fvms-command-language">VAX/VMS command language</A>)<DT><A NAME="dd-command">dd command</A><DD><DL> <DT><A HREF="../ch35_06.htm">35.6. Low-Level File Butchery with dd </A> <DT><A HREF="../ch52_04.htm">52.4. Quick Descriptions of What's on the Disc </A> <DT>performance and: <A HREF="../ch20_06.htm">20.6. Writing a Tape Drive on a Remote Machine </A> <DT>restoring from remote tape drives: <A HREF="../ch20_05.htm">20.5. Using tar to a Remote Tape Drive </A></DL><DT><A NAME="dd-utility">dd utility</A><DD><DL> <DT><A HREF="../ch35_12.htm">35.12. Converting Between ASCII and EBCDIC </A> <DT><A HREF="../ch35_13.htm">35.13. Other Conversions with dd </A></DL><DT><A NAME="dead-processes">dead processes</A>: (see <A HREF="idx_z.htm#zombies">zombies</A>)<DT><A NAME="debugging">debugging</A><DD><DL> <DT><A HREF="../ch44_09.htm">44.9. Testing Your Success </A> <DT>(see also <A HREF="idx_e.htm#errors">errors</A>; <A HREF="idx_s.htm#standard-error">standard error</A>) <DT>Bourne shell scripts <DD><DL> <DT><A HREF="../ch44_08.htm">44.8. Test Exit Status with the if Statement </A> <DT><A HREF="../ch46_01.htm#UPT-ART-7160">46.1. Tips for Debugging Shell Scripts </A> </DL> <DT>echo command used for: <A HREF="../ch46_02.htm">46.2. Quoting Trouble? Think, Then Use echo </A> <DT>output <DD><DL> <DT><A HREF="../ch46_01.htm#UPT-ART-7160-SECT-1.1">46.1.1. Use -xv </A> <DT>(see also <A HREF="idx_s.htm#standard-output">standard output</A>) </DL> <DT>piping to pager: <A HREF="../ch46_01.htm#UPT-ART-7160-SECT-1.1">46.1.1. Use -xv </A></DL><DT><A NAME="debugging-output">debugging output</A>: <A HREF="../ch46_01.htm#UPT-ART-7160-SECT-1.1">46.1.1. Use -xv </A><DT><A NAME="decimals">decimals, ASCII character conversion</A>: <A HREF="../ch45_11.htm">45.11. The Multipurpose jot Command </A><DT><A NAME="decryption">decryption</A>: (see <A HREF="idx_e.htm#encryption">encryption</A>)<DT><A NAME=".3cdefunct.3e-status-under-system-v"><defunct> status under System V</A>: <A HREF="../ch38_10.htm">38.10. Destroying Processes with kill </A><DT><A NAME="del">DEL (to interrupt)</A>: <A HREF="../ch41_02.htm#UPT-ART-1140-SECT-1.1">41.2.1. How We Made It This Far (Back?) </A><DT><A NAME="del-script">del script</A><DD><DL> <DT><A HREF="../ch23_06.htm">23.6. A Faster Way to Remove Files Interactively </A> <DT><A HREF="../ch52_04.htm">52.4. Quick Descriptions of What's on the Disc </A></DL><DT><A NAME="delete">DELETE</A>: <A HREF="../ch41_02.htm#UPT-ART-1140-SECT-1.2">41.2.2. Handling Most Characters </A><DT><A NAME="delete-command">delete command</A>: <A HREF="../ch52_04.htm">52.4. Quick Descriptions of What's on the Disc </A><DT><A NAME="delete-command">delete 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="delete-command">delete command (ex)</A>: <A HREF="../ch33_04.htm">33.4. Useful ex Commands </A><DT><A NAME="delete-key">DELETE key</A><DD><DL> <DT>deleting on command line: <A HREF="../ch09_02.htm">9.2. Fix a Line Faster with Line-Kill and Word-Erase </A> <DT>erase character: <A HREF="../ch51_06.htm">51.6. Cleaning script Files </A> <DT>location for: <A HREF="../ch02_13.htm">2.13. A .cshrc.$HOST File for Per Host Setup </A></DL><DT><A NAME="delete-script">delete script</A>: <A HREF="../ch23_09.htm">23.9. delete: Protecting Files from Accidental Deletion </A><DT><A NAME="deleting">deleting</A><DD><DL> <DT>directories <DD><DL> <DT><A HREF="../ch23_17.htm">23.17. Problems Deleting Directories </A> <DT><A HREF="../ch23_18.htm">23.18. How Making and Deleting Directories Works </A> <DT><A HREF="../ch50_12.htm">50.12. Common UNIX Error Messages </A> </DL> <DT>errors caused by: <A HREF="../ch50_12.htm">50.12. Common UNIX Error Messages </A> <DT><A NAME="deleting-files">files</A> <DD><DL> <DT><A HREF="../ch01_15.htm">1.15. Filenames </A> <DT><A HREF="../ch21_11.htm">21.11. Safer Removing, Moving, and Copying </A> <DT><A HREF="../ch23_02.htm">23.2. rm and Its Dangers </A> <DT><A HREF="../ch23_05.htm">23.5. Remove Some, Leave Some </A> <DT><A HREF="../ch23_10.htm">23.10. Deletion with Prejudice: rm -f </A> <DT><A HREF="../ch45_10.htm">45.10. Removing a File Once It's Opened - for Security and Easy Cleanup</A> <DT>"by: <A HREF="../ch23_21.htm">23.21. Removing Every File but One </A> <DT>by last access date: <A HREF="../ch23_20.htm">23.20. Deleting Stale Files </A> <DT>emptying files instead of: <A HREF="../ch24_01.htm#UPT-ART-1730">24.1. Instead of Removing a File, Empty It </A> <DT>find command and: <A HREF="../ch23_22.htm">23.22. Using find to Clear Out Unneeded Files </A> <DT>by i-number: <A HREF="../ch23_16.htm">23.16. Removing a Strange File by its I-number </A> <DT>interactively: <A HREF="../ch23_06.htm">23.6. A Faster Way to Remove Files Interactively </A> <DT>safeguards against <DD><DL> <DT><A HREF="../ch20_13.htm">20.13. SCCS Basics </A> <DT><A HREF="../ch21_11.htm">21.11. Safer Removing, Moving, and Copying </A> <DT><A HREF="../ch23_07.htm">23.7. Safer File Deletion in Some Directories </A> <DT><A HREF="../ch23_09.htm">23.9. delete: Protecting Files from Accidental Deletion </A> </DL> <DT>with special filename characters: <A HREF="../ch23_11.htm">23.11. Deleting Files with Odd Names </A> <DT>with unlink command: <A HREF="../ch23_15.htm">23.15. Using unlink to Remove a File with a Strange Name </A> </DL> <DT>man pages: <A HREF="../ch23_19.htm">23.19. Deleting (BSD) Manual Pages that Aren't Read </A> <DT>whitespace <DD><DL> <DT><A HREF="../ch25_09.htm">25.9. Adding and Deleting White Space </A> <DT><A HREF="../ch25_13.htm">25.13. pushin: Squeeze Out Extra White Space </A> </DL> <DT>wildcards and: <A HREF="../ch23_02.htm">23.2. rm and Its Dangers </A></DL><DT><A NAME="delta-command">delta command (SCCS)</A>: <A HREF="../ch20_13.htm">20.13. SCCS Basics </A><DT><A NAME="deroff-command">deroff command</A>: <A HREF="../ch29_10.htm">29.10. Just the Words, Please </A><DT><A NAME="detaching-sessions">detaching sessions</A>: <A HREF="../ch03_07.htm">3.7. Detaching a Session with screen </A><DT><A NAME=".2fdev-directory">/dev directory</A>: <A HREF="../ch13_01.htm#UPT-ART-1023">13.1. Using Standard Input and Output</A><DD><DL> <DT>/dev/tty file <DD><DL> <DT>examples: <A HREF="../ch47_02.htm#UPT-ART-393-SECT-1.1.1">47.2.1.1. Writing Files </A> </DL> <DT>/dev/null file <DD><DL> <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="../ch45_36.htm">45.36. Shell Lockfile </A> </DL> </DL> <DT>/dev/null file <DD><DL> <DT><A HREF="../ch13_14.htm">13.14. What Can You Do with an Empty File? </A> <DT><A HREF="../ch13_15.htm">13.15. What to Do with a Full Bit Bucket :-) </A> </DL> <DT>/dev/tty file: <A HREF="../ch13_03.htm">13.3. Send (only) Standard Error Down a Pipe </A> <DT>/dev/zero file: <A HREF="../ch13_14.htm">13.14. What Can You Do with an Empty File? </A></DL><DT><A NAME="device-drivers">device drivers, resetting</A>: <A HREF="../ch38_15.htm">38.15. Cleaning Up an Unkillable Process </A><DT><A NAME="device-numbers">device numbers</A>: <A HREF="../ch17_22.htm">17.22. Finding the Links to a File </A><DT><A NAME="df-command">df command</A><DD><DL> <DT><A HREF="../ch17_22.htm">17.22. Finding the Links to a File </A> <DT><A HREF="../ch24_09.htm">24.9. How Much Disk Space? </A> <DT><A HREF="../ch52_04.htm">52.4. Quick Descriptions of What's on the Disc </A> <DT>examples: <A HREF="../ch45_30.htm#UPT-ART-232-SECT-1.4">45.30.4. Using sed </A></DL><DT><A NAME="dialback-script">dialback script</A>: <A HREF="../ch09_26.htm#UPT-ART-9912-SECT-1.1">9.26.1. Dialback </A><DT><A NAME="dictionary-files">dictionary files</A>: <A HREF="../ch29_01.htm#UPT-ART-4080">29.1. The UNIX spell Command </A><DD><DL> <DT>adding to: <A HREF="../ch29_05.htm">29.5. Adding Words to ispell's Dictionary </A></DL><DT><A NAME="diff-command">diff command</A><DD><DL> <DT><A HREF="../ch02_14.htm">2.14. motd.diff: Show New Lines in Login Messages</A> <DT><A HREF="../ch28_01.htm#UPT-ART-2680">28.1. Checking Differences with diff </A> <DT><A HREF="../ch52_04.htm">52.4. Quick Descriptions of What's on the Disc </A> <DT>(see also <A HREF="idx_b.htm#bdiff-command">bdiff command</A>; <A HREF="idx_e.htm#ediff-script">ediff script</A>) <DT>-c option: <A HREF="../ch28_03.htm">28.3. Context diffs </A> <DT>-e option <DD><DL> <DT><A HREF="../ch28_01.htm#UPT-ART-2680">28.1. Checking Differences with diff </A> <DT><A HREF="../ch28_09.htm">28.9. ex Scripts Built by diff </A> </DL> <DT>example: <A HREF="../ch33_06.htm">33.6. Change Many Files by Editing Just One </A> <DT>-f option: <A HREF="../ch16_22.htm">16.22. Comparing Two Directory Trees with dircmp </A> <DT>-h option: <A HREF="../ch28_07.htm">28.7. diff for Very Long Files: bdiff </A> <DT>-t option: <A HREF="../ch28_10.htm">28.10. Problems with diff and Tabstops </A></DL><DT><A NAME="diff.33-script">diff3 script</A><DD><DL> <DT><A HREF="../ch28_02.htm">28.2. Comparing Three Different Versions with diff3 </A> <DT><A HREF="../ch52_04.htm">52.4. Quick Descriptions of What's on the Disc </A></DL><DT><A NAME="diffmk-command">diffmk command</A>: <A HREF="../ch28_15.htm">28.15. Show Changes in a troff File with diffmk </A><DT><A NAME="dir.5fpath-script">dir_path script</A><DD><DL> <DT><A HREF="../ch16_21.htm">16.21. Finding All Directories with the Same Name </A> <DT><A HREF="../ch52_04.htm">52.4. Quick Descriptions of What's on the Disc </A></DL><DT><A NAME="dircmp-command">dircmp command</A>: <A HREF="../ch16_22.htm">16.22. Comparing Two Directory Trees with dircmp </A><DT><A NAME="directories">directories</A>: <A HREF="../ch23_18.htm">23.18. How Making and Deleting Directories Works </A><DD><DL> <DT>!$ sequence and: <A HREF="../ch11_03.htm">11.3. My Favorite Is !$ </A> <DT>absolute pathnames and: <A HREF="../ch14_02.htm">14.2. Using Relative and Absolute Pathnames </A> <DT>access to: <A HREF="../ch01_25.htm">1.25. Access to Directories </A> <DT>advantages of: <A HREF="../ch04_07.htm">4.7. Make More Directories! </A> <DT>archives/backups of <DD><DL> <DT><A HREF="../ch20_01.htm#UPT-ART-8024">20.1. tar in a Nutshell </A> <DT><A HREF="../ch20_08.htm#UPT-ART-424-SECT-1.1">20.8.1. Including Other Directories </A> </DL> <DT>automatic setup of⌨️ 快捷键说明
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