index.html

一本完整的描述Unix Shell 编程的工具书的所有范例

><DT
>17-6. <A
HREF="here-docs.html#EX72"
>Upload a file pair to <SPAN
CLASS="QUOTE"
>"Sunsite"</SPAN
> incoming
	  directory</A
></DT
><DT
>17-7. <A
HREF="here-docs.html#EX71C"
>Parameter substitution turned off</A
></DT
><DT
>17-8. <A
HREF="here-docs.html#GENERATESCRIPT"
>A script that generates another script</A
></DT
><DT
>17-9. <A
HREF="here-docs.html#HF"
>Here documents and functions</A
></DT
><DT
>17-10. <A
HREF="here-docs.html#ANONHEREDOC"
><SPAN
CLASS="QUOTE"
>"Anonymous"</SPAN
> Here Document</A
></DT
><DT
>17-11. <A
HREF="here-docs.html#COMMENTBLOCK"
>Commenting out a block of code</A
></DT
><DT
>17-12. <A
HREF="here-docs.html#SELFDOCUMENT"
>A self-documenting script</A
></DT
><DT
>17-13. <A
HREF="here-docs.html#PREPENDEX"
>Prepending a line to a file</A
></DT
><DT
>20-1. <A
HREF="subshells.html#SUBSHELL"
>Variable scope in a subshell</A
></DT
><DT
>20-2. <A
HREF="subshells.html#ALLPROFS"
>List User Profiles</A
></DT
><DT
>20-3. <A
HREF="subshells.html#PARALLEL-PROCESSES"
>Running parallel processes in subshells</A
></DT
><DT
>21-1. <A
HREF="restricted-sh.html#RESTRICTED"
>Running a script in restricted mode</A
></DT
><DT
>23-1. <A
HREF="functions.html#EX59"
>Simple functions</A
></DT
><DT
>23-2. <A
HREF="functions.html#EX60"
>Function Taking Parameters</A
></DT
><DT
>23-3. <A
HREF="functions.html#FUNCCMDLINEARG"
>Functions and command-line args passed to the script</A
></DT
><DT
>23-4. <A
HREF="functions.html#INDFUNC"
>Passing an indirect reference to a function</A
></DT
><DT
>23-5. <A
HREF="functions.html#DEREFERENCECL"
>Dereferencing a parameter passed to a function</A
></DT
><DT
>23-6. <A
HREF="functions.html#REFPARAMS"
>Again, dereferencing a parameter passed to a function</A
></DT
><DT
>23-7. <A
HREF="functions.html#MAX"
>Maximum of two numbers</A
></DT
><DT
>23-8. <A
HREF="functions.html#EX61"
>Converting numbers to Roman numerals</A
></DT
><DT
>23-9. <A
HREF="functions.html#RETURNTEST"
>Testing large return values in a function</A
></DT
><DT
>23-10. <A
HREF="functions.html#MAX2"
>Comparing two large integers</A
></DT
><DT
>23-11. <A
HREF="functions.html#REALNAME"
>Real name from username</A
></DT
><DT
>23-12. <A
HREF="localvar.html#EX62"
>Local variable visibility</A
></DT
><DT
>23-13. <A
HREF="localvar.html#EX63"
>Recursion, using a local variable</A
></DT
><DT
>23-14. <A
HREF="recurnolocvar.html#HANOI"
>The Towers of Hanoi</A
></DT
><DT
>24-1. <A
HREF="aliases.html#AL"
>Aliases within a script</A
></DT
><DT
>24-2. <A
HREF="aliases.html#UNAL"
><B
CLASS="COMMAND"
>unalias</B
>: Setting and unsetting an alias</A
></DT
><DT
>25-1. <A
HREF="list-cons.html#EX64"
>Using an <SPAN
CLASS="QUOTE"
>"and list"</SPAN
> to test for command-line arguments</A
></DT
><DT
>25-2. <A
HREF="list-cons.html#ANDLIST2"
>Another command-line arg test using an <SPAN
CLASS="QUOTE"
>"and list"</SPAN
></A
></DT
><DT
>25-3. <A
HREF="list-cons.html#EX65"
>Using <SPAN
CLASS="QUOTE"
>"or lists"</SPAN
> in combination with an <SPAN
CLASS="QUOTE"
>"and list"</SPAN
></A
></DT
><DT
>26-1. <A
HREF="arrays.html#EX66"
>Simple array usage</A
></DT
><DT
>26-2. <A
HREF="arrays.html#POEM"
>Formatting a poem</A
></DT
><DT
>26-3. <A
HREF="arrays.html#ARRAYOPS"
>Various array operations</A
></DT
><DT
>26-4. <A
HREF="arrays.html#ARRAYSTROPS"
>String operations on arrays</A
></DT
><DT
>26-5. <A
HREF="arrays.html#SCRIPTARRAY"
>Loading the contents of a script into an array</A
></DT
><DT
>26-6. <A
HREF="arrays.html#EX67"
>Some special properties of arrays</A
></DT
><DT
>26-7. <A
HREF="arrays.html#EMPTYARRAY"
>Of empty arrays and empty elements</A
></DT
><DT
>26-8. <A
HREF="arrays.html#ARRAYASSIGN"
>Initializing arrays</A
></DT
><DT
>26-9. <A
HREF="arrays.html#COPYARRAY"
>Copying and concatenating arrays</A
></DT
><DT
>26-10. <A
HREF="arrays.html#ARRAYAPPEND"
>More on concatenating arrays</A
></DT
><DT
>26-11. <A
HREF="arrays.html#BUBBLE"
>An old friend:
             <I
CLASS="EMPHASIS"
>The Bubble Sort</I
></A
></DT
><DT
>26-12. <A
HREF="arrays.html#EMBARR"
>Embedded arrays and indirect references</A
></DT
><DT
>26-13. <A
HREF="arrays.html#EX68"
>Complex array application:
             <I
CLASS="EMPHASIS"
>Sieve of Eratosthenes</I
></A
></DT
><DT
>26-14. <A
HREF="arrays.html#STACKEX"
>Emulating a push-down stack</A
></DT
><DT
>26-15. <A
HREF="arrays.html#QFUNCTION"
>Complex array application:
             <I
CLASS="EMPHASIS"
>Exploring a weird mathematical series</I
></A
></DT
><DT
>26-16. <A
HREF="arrays.html#TWODIM"
>Simulating a two-dimensional array, then tilting it</A
></DT
><DT
>27-1. <A
HREF="devproc.html#DEVTCP"
>Using <TT
CLASS="FILENAME"
>/dev/tcp</TT
> for troubleshooting</A
></DT
><DT
>27-2. <A
HREF="procref1.html#PIDID"
>Finding the process associated with a PID</A
></DT
><DT
>27-3. <A
HREF="procref1.html#CONSTAT"
>On-line connect status</A
></DT
><DT
>28-1. <A
HREF="zeros.html#COOKIES"
>Hiding the cookie jar</A
></DT
><DT
>28-2. <A
HREF="zeros.html#EX73"
>Setting up a swapfile using <TT
CLASS="FILENAME"
>/dev/zero</TT
></A
></DT
><DT
>28-3. <A
HREF="zeros.html#RAMDISK"
>Creating a ramdisk</A
></DT
><DT
>29-1. <A
HREF="debugging.html#EX74"
>A buggy script</A
></DT
><DT
>29-2. <A
HREF="debugging.html#MISSINGKEYWORD"
>Missing <A
HREF="internal.html#KEYWORDREF"
>keyword</A
></A
></DT
><DT
>29-3. <A
HREF="debugging.html#EX75"
>test24, another buggy script</A
></DT
><DT
>29-4. <A
HREF="debugging.html#ASSERT"
>Testing a condition with an <SPAN
CLASS="QUOTE"
>"assert"</SPAN
></A
></DT
><DT
>29-5. <A
HREF="debugging.html#EX76"
>Trapping at exit</A
></DT
><DT
>29-6. <A
HREF="debugging.html#ONLINE"
>Cleaning up after Control-C</A
></DT
><DT
>29-7. <A
HREF="debugging.html#VARTRACE"
>Tracing a variable</A
></DT
><DT
>29-8. <A
HREF="debugging.html#MULTIPLEPROC"
>Running multiple processes (on an SMP box)</A
></DT
><DT
>31-1. <A
HREF="gotchas.html#BADOP"
>Numerical and string comparison are not equivalent</A
></DT
><DT
>31-2. <A
HREF="gotchas.html#SUBPIT"
>Subshell Pitfalls</A
></DT
><DT
>31-3. <A
HREF="gotchas.html#BADREAD"
>Piping the output of <B
CLASS="COMMAND"
>echo</B
> to a <B
CLASS="COMMAND"
>read</B
></A
></DT
><DT
>33-1. <A
HREF="wrapper.html#EX3"
><B
CLASS="COMMAND"
>shell wrapper</B
></A
></DT
><DT
>33-2. <A
HREF="wrapper.html#EX4"
>A slightly more complex <B
CLASS="COMMAND"
>shell wrapper</B
></A
></DT
><DT
>33-3. <A
HREF="wrapper.html#LOGGINGWRAPPER"
>A generic <B
CLASS="COMMAND"
>shell wrapper</B
> that writes to a logfile</A
></DT
><DT
>33-4. <A
HREF="wrapper.html#PRASC"
>A <B
CLASS="COMMAND"
>shell wrapper</B
> around an awk script</A
></DT
><DT
>33-5. <A
HREF="wrapper.html#COLTOTALER"
>A <B
CLASS="COMMAND"
>shell wrapper</B
> around another awk script</A
></DT
><DT
>33-6. <A
HREF="wrapper.html#EX56"
>Perl embedded in a <B
CLASS="COMMAND"
>Bash</B
> script</A
></DT
><DT
>33-7. <A
HREF="wrapper.html#BASHANDPERL"
>Bash and Perl scripts combined</A
></DT
><DT
>33-8. <A
HREF="recursionsct.html#RECURSE"
>A (useless) script that recursively calls itself</A
></DT
><DT
>33-9. <A
HREF="recursionsct.html#PBOOK"
>A (useful) script that recursively calls itself</A
></DT
><DT
>33-10. <A
HREF="recursionsct.html#USRMNT"
>Another (useful) script that recursively calls itself</A
></DT
><DT
>33-11. <A
HREF="colorizing.html#EX30A"
>A <SPAN
CLASS="QUOTE"
>"colorized"</SPAN
> address database</A
></DT
><DT
>33-12. <A
HREF="colorizing.html#DRAW-BOX"
>Drawing a box</A
></DT
><DT
>33-13. <A
HREF="colorizing.html#COLORECHO"
>Echoing colored text</A
></DT
><DT
>33-14. <A
HREF="colorizing.html#HORSERACE"
>A <SPAN
CLASS="QUOTE"
>"horserace"</SPAN
> game</A
></DT
><DT
>33-15. <A
HREF="assortedtips.html#MULTIPLICATION"
>Return value trickery</A
></DT
><DT
>33-16. <A
HREF="assortedtips.html#SUMPRODUCT"
>Even more return value trickery</A
></DT
><DT
>33-17. <A
HREF="assortedtips.html#ARRFUNC"
>Passing and returning arrays</A
></DT
><DT
>33-18. <A
HREF="assortedtips.html#AGRAM"
>Fun with anagrams</A
></DT
><DT
>33-19. <A
HREF="assortedtips.html#DIALOG"
><B
CLASS="COMMAND"
>Widgets invoked from a shell script</B
></A
></DT
><DT
>34-1. <A
HREF="bash2.html#EX77"
>String expansion</A
></DT
><DT
>34-2. <A
HREF="bash2.html#EX78"
>Indirect variable references - the new way</A
></DT
><DT
>34-3. <A
HREF="bash2.html#RESISTOR"
>Simple database application, using indirect variable
	  referencing</A
></DT
><DT
>34-4. <A
HREF="bash2.html#EX79"
>Using arrays and other miscellaneous trickery
	  to deal four random hands from a deck of cards</A
></DT
><DT
>A-1. <A
HREF="contributed-scripts.html#MAILFORMAT"
><B
CLASS="COMMAND"
>mailformat</B
>: Formatting an e-mail message</A
></DT
><DT
>A-2. <A
HREF="contributed-scripts.html#RN"
><B
CLASS="COMMAND"
>rn</B
>: A simple-minded file rename utility</A
></DT
><DT
>A-3. <A
HREF="contributed-scripts.html#BLANKRENAME"
><B
CLASS="COMMAND"
>blank-rename</B
>: renames filenames containing
        blanks</A
></DT
><DT
>A-4. <A
HREF="contributed-scripts.html#ENCRYPTEDPW"
><B
CLASS="COMMAND"
>encryptedpw</B
>: Uploading to an ftp site,
      using a locally encrypted password</A
></DT
><DT
>A-5. <A
HREF="contributed-scripts.html#COPYCD"
><B
CLASS="COMMAND"
>copy-cd</B
>: Copying a data CD</A
></DT
><DT
>A-6. <A
HREF="contributed-scripts.html#COLLATZ"
>Collatz series</A
></DT
><DT
>A-7. <A
HREF="contributed-scripts.html#DAYSBETWEEN"
><B
CLASS="COMMAND"
>days-between</B
>: Calculate number of days
        between two dates</A
></DT
><DT
>A-8. <A
HREF="contributed-scripts.html#MAKEDICT"
>Make a <SPAN
CLASS="QUOTE"
>"dictionary"</SPAN
></A
></DT
><DT
>A-9. <A
HREF="contributed-scripts.html#SOUNDEX"
>Soundex conversion</A
></DT
><DT
>A-10. <A
HREF="contributed-scripts.html#LIFESLOW"
><SPAN
CLASS="QUOTE"
>"Game of Life"</SPAN
></A
></DT
><DT
>A-11. <A
HREF="contributed-scripts.html#GEN0DATA"
>Data file for <SPAN
CLASS="QUOTE"
>"Game of Life"</SPAN
></A
></DT
><DT
>A-12. <A
HREF="contributed-scripts.html#BEHEAD"
><B
CLASS="COMMAND"
>behead</B
>: Removing mail and news message headers</A
></DT
><DT
>A-13. <A
HREF="contributed-scripts.html#FTPGET"
><B
CLASS="COMMAND"
>ftpget</B
>: Downloading files via ftp</A
></DT
><DT
>A-14. <A
HREF="contributed-scripts.html#PW"
><B
CLASS="COMMAND"
>password</B
>: Generating random
      8-character passwords</A
></DT
><DT
>A-15. <A
HREF="contributed-scripts.html#FIFO"
><B
CLASS="COMMAND"
>fifo</B
>: Making daily backups, using named pipes</A
></DT
><DT
>A-16. <A
HREF="contributed-scripts.html#PRIMES"
>Generating prime numbers using the modulo operator</A
></DT
><DT
>A-17. <A
HREF="contributed-scripts.html#TREE"
><B
CLASS="COMMAND"
>tree</B
>: Displaying a directory tree</A
></DT
><DT
>A-18. <A
HREF="contributed-scripts.html#STRING"
><B
CLASS="COMMAND"
>string functions</B
>: C-like string functions</A
></DT
><DT
>A-19. <A
HREF="contributed-scripts.html#DIRECTORYINFO"
>Directory information</A
></DT
><DT
>A-20. <A
HREF="contributed-scripts.html#OBJORIENTED"
>Object-oriented database</A
></DT
><DT
>A-21. <A
HREF="contributed-scripts.html#HASHLIB"
>Library of hash functions</A
></DT
><DT
>A-22. <A
HREF="contributed-scripts.html#HASHEXAMPLE"
>Colorizing text using hash functions</A
></DT
><DT
>A-23. <A
HREF="contributed-scripts.html#USBINST"
>Mounting USB keychain storage devices</A
></DT
><DT
>A-24. <A
HREF="contributed-scripts.html#ARCHIVWEBLOGS"
>Preserving weblogs</A
></DT
><DT
>A-25. <A
HREF="contributed-scripts.html#PROTECTLITERAL"
>Protecting literal strings</A
></DT
><DT
>A-26. <A
HREF="contributed-scripts.html#UNPROTECTLITERAL"
>Unprotecting literal strings</A
></DT
><DT
>A-27. <A
HREF="contributed-scripts.html#ISSPAMMER2"
>Spammer Identification</A
></DT
><DT
>A-28. <A
HREF="contributed-scripts.html#WHX"
>Spammer Hunt</A
></DT
><DT
>A-29. <A
HREF="contributed-scripts.html#WGETTER2"
>Making <B
CLASS="COMMAND"
>wget</B
> easier to use</A
></DT
><DT
>A-30. <A
HREF="contributed-scripts.html#BASHPODDER"
>A <SPAN
CLASS="QUOTE"
>"podcasting"</SPAN
> script</A
></DT
><DT
>A-31. <A
HREF="contributed-scripts.html#BASICSREVIEWED"
>Basics Reviewed</A
></DT
><DT
>A-32. <A
HREF="contributed-scripts.html#CDLL"
>An expanded <B
CLASS="COMMAND"
>cd</B
> command</A
></DT
><DT
>C-1. <A
HREF="awk.html#LETTERCOUNT2"
>Counting Letter Occurrences</A
></DT
><DT
>K-1. <A
HREF="sample-bashrc.html#BASHRC"
>Sample <TT
CLASS="FILENAME"
>.bashrc</TT
> file</A
></DT
><DT
>L-1. <A
HREF="dosbatch.html#VIEWDAT"
>VIEWDATA.BAT: DOS Batch File</A
></DT
><DT
>L-2. <A
HREF="dosbatch.html#VIEWDATA"
>viewdata.sh: Shell Script Conversion of VIEWDATA.BAT</A
></DT
><DT
>P-1. <A
HREF="todolist.html#TESTCGI"
>Print the server environment</A
></DT
></DL
></DIV
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ALIGN="right"
VALIGN="top"
><A
HREF="part1.html"
>Next</A
></TD
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>&nbsp;</TD
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>Introduction</TD
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