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>高级Bash脚本编程指南: 一本深入学习shell脚本艺术的书籍</TH
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></A
>Appendix A. 捐献的脚本</H1
><P
>这些脚本展示了一些有趣的shell编程技术, 但是它们并不适合放入本文档的文本讲解中.
不过它们还是非常有用, 运行和分析它们都是很有意思的事. </P
><P
>译者: 这里留给那些有能力而且有多余时间的读者来详读, 个人认为翻译这些注释有点画蛇添足. </P
><DIV
CLASS="EXAMPLE"
><HR><A
NAME="MAILFORMAT"
></A
><P
><B
>例子 A-1. <B
CLASS="COMMAND"
>mailformat</B
>: 格式化一个e-mail消息</B
></P
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CLASS="PROGRAMLISTING"
> 1 #!/bin/bash
2 # mail-format.sh (ver. 1.1): Format e-mail messages.
3
4 # Gets rid of carets, tabs, and also folds excessively long lines.
5
6 # =================================================================
7 # Standard Check for Script Argument(s)
8 ARGS=1
9 E_BADARGS=65
10 E_NOFILE=66
11
12 if [ $# -ne $ARGS ] # Correct number of arguments passed to script?
13 then
14 echo "Usage: `basename $0` filename"
15 exit $E_BADARGS
16 fi
17
18 if [ -f "$1" ] # Check if file exists.
19 then
20 file_name=$1
21 else
22 echo "File \"$1\" does not exist."
23 exit $E_NOFILE
24 fi
25 # =================================================================
26
27 MAXWIDTH=70 # Width to fold excessively long lines to.
28
29 # ---------------------------------
30 # A variable can hold a sed script.
31 sedscript='s/^>//
32 s/^ *>//
33 s/^ *//
34 s/ *//'
35 # ---------------------------------
36
37 # Delete carets and tabs at beginning of lines,
38 #+ then fold lines to $MAXWIDTH characters.
39 sed "$sedscript" $1 | fold -s --width=$MAXWIDTH
40 # -s option to "fold"
41 #+ breaks lines at whitespace, if possible.
42
43
44 # This script was inspired by an article in a well-known trade journal
45 #+ extolling a 164K MS Windows utility with similar functionality.
46 #
47 # An nice set of text processing utilities and an efficient
48 #+ scripting language provide an alternative to bloated executables.
49
50 exit 0</PRE
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><HR></DIV
><DIV
CLASS="EXAMPLE"
><HR><A
NAME="RN"
></A
><P
><B
>例子 A-2. <B
CLASS="COMMAND"
>rn</B
>: 一个非常简单的文件重命名工具</B
></P
><P
>这个脚本是<A
HREF="textproc.html#LOWERCASE"
>例子 12-19</A
>的一个修改版. </P
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><PRE
CLASS="PROGRAMLISTING"
> 1 #! /bin/bash
2 #
3 # Very simpleminded filename "rename" utility (based on "lowercase.sh").
4 #
5 # The "ren" utility, by Vladimir Lanin ([email protected]),
6 #+ does a much better job of this.
7
8
9 ARGS=2
10 E_BADARGS=65
11 ONE=1 # For getting singular/plural right (see below).
12
13 if [ $# -ne "$ARGS" ]
14 then
15 echo "Usage: `basename $0` old-pattern new-pattern"
16 # As in "rn gif jpg", which renames all gif files in working directory to jpg.
17 exit $E_BADARGS
18 fi
19
20 number=0 # Keeps track of how many files actually renamed.
21
22
23 for filename in *$1* #Traverse all matching files in directory.
24 do
25 if [ -f "$filename" ] # If finds match...
26 then
27 fname=`basename $filename` # Strip off path.
28 n=`echo $fname | sed -e "s/$1/$2/"` # Substitute new for old in filename.
29 mv $fname $n # Rename.
30 let "number += 1"
31 fi
32 done
33
34 if [ "$number" -eq "$ONE" ] # For correct grammar.
35 then
36 echo "$number file renamed."
37 else
38 echo "$number files renamed."
39 fi
40
41 exit 0
42
43
44 # Exercises:
45 # ---------
46 # What type of files will this not work on?
47 # How can this be fixed?
48 #
49 # Rewrite this script to process all the files in a directory
50 #+ containing spaces in their names, and to rename them,
51 #+ substituting an underscore for each space.</PRE
></FONT
></TD
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></TABLE
><HR></DIV
><DIV
CLASS="EXAMPLE"
><HR><A
NAME="BLANKRENAME"
></A
><P
><B
>例子 A-3. <B
CLASS="COMMAND"
>blank-rename</B
>: 重命名包含空白的文件名</B
></P
><P
>这是上一个脚本的简化版. </P
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><TD
><FONT
COLOR="#000000"
><PRE
CLASS="PROGRAMLISTING"
> 1 #! /bin/bash
2 # blank-rename.sh
3 #
4 # Substitutes underscores for blanks in all the filenames in a directory.
5
6 ONE=1 # For getting singular/plural right (see below).
7 number=0 # Keeps track of how many files actually renamed.
8 FOUND=0 # Successful return value.
9
10 for filename in * #Traverse all files in directory.
11 do
12 echo "$filename" | grep -q " " # Check whether filename
13 if [ $? -eq $FOUND ] #+ contains space(s).
14 then
15 fname=$filename # Strip off path.
16 n=`echo $fname | sed -e "s/ /_/g"` # Substitute underscore for blank.
17 mv "$fname" "$n" # Do the actual renaming.
18 let "number += 1"
19 fi
20 done
21
22 if [ "$number" -eq "$ONE" ] # For correct grammar.
23 then
24 echo "$number file renamed."
25 else
26 echo "$number files renamed."
27 fi
28
29 exit 0</PRE
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></TD
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><HR></DIV
><DIV
CLASS="EXAMPLE"
><HR><A
NAME="ENCRYPTEDPW"
></A
><P
><B
>例子 A-4. <B
CLASS="COMMAND"
>encryptedpw</B
>: 使用一个本地加密口令, 上传到一个ftp服务器. </B
></P
><TABLE
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><TR
><TD
><FONT
COLOR="#000000"
><PRE
CLASS="PROGRAMLISTING"
> 1 #!/bin/bash
2
3 # Example "ex72.sh" modified to use encrypted password.
4
5 # Note that this is still rather insecure,
6 #+ since the decrypted password is sent in the clear.
7 # Use something like "ssh" if this is a concern.
8
9 E_BADARGS=65
10
11 if [ -z "$1" ]
12 then
13 echo "Usage: `basename $0` filename"
14 exit $E_BADARGS
15 fi
16
17 Username=bozo # Change to suit.
18 pword=/home/boz
shell编程经典书籍 （627个子文件） 
is_spammer.bash 64KB basics-reviewed.bash 30KB wgetter2.bash 17KB hanoi.bash 3KB array-append.bash 3KB array-assign.bash 2KB remote.bash 2KB bashrc 17KB viewdata.bat 323B cdll 26KB ChangeLog 561B ChangeLog 477B names.data 235B words.data 82B data-file 656B important.eps 9KB caution.eps 8KB warning.eps 8KB next.eps 8KB prev.eps 8KB home.eps 8KB up.eps 8KB tip.eps 7KB note.eps 7KB toc-blank.eps 6KB 10.eps 6KB 7.eps 6KB 9.eps 6KB 6.eps 6KB 4.eps 6KB 2.eps 6KB 1.eps 6KB 5.eps 6KB 8.eps 6KB 3.eps 6KB toc-minus.eps 6KB toc-plus.eps 6KB continue-n.example 2KB eval.example 622B gen0 570B
important.gif 1KB note.gif 1KB warning.gif 1KB caution.gif 1KB tip.gif 1KB home.gif 995B next.gif 964B prev.gif 944B 10.gif 926B up.gif 922B 9.gif 919B 6.gif 917B 8.gif 915B 3.gif 914B 5.gif 912B 2.gif 907B 4.gif 907B 7.gif 903B 1.gif 890B toc-plus.gif 846B toc-minus.gif 843B toc-blank.gif 95B
contributed-scripts.html 317KB system.html 99KB internal.html 73KB textproc.html 62KB special-chars.html 62KB filearchiv.html 56KB arrays.html 56KB internalvariables.html 49KB index.html 43KB communications.html 39KB extmisc.html 36KB writingscripts.html 29KB parameter-substitution.html 28KB loops1.html 27KB assortedtips.html 27KB moreadv.html 27KB biblio.html 27KB here-docs.html 25KB sample-bashrc.html 25KB debugging.html 25KB complexfunct.html 25KB mathc.html 23KB randomvar.html 23KB string-manipulation.html 22KB gotchas.html 21KB basic.html 20KB commandsub.html 19KB testconstructs.html 19KB refcards.html 19KB ops.html 19KB x13673.html 18KB intro_regular.html 18KB x13662.html 18KB x13639.html 18KB x13661.html 18KB x13642.html 18KB x13634.html 18KB x13650.html 18KB共 627 条
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