Linux Shell Bash 精彩脚本示例.doc

Linux Shell Bash 精彩脚本示例/content/10/0303/18/155970_1座机电话号码.shtml 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. 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. 例子 A-1. mailformat: 格式化一个e-mail消息 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?# 例子 A-2. rn: 一个非常简单的文件重命名工具 这个脚本是例子 12-19的一个修改版. 1?#! /bin/bash 2?# 3?# Very simpleminded filename rename utility based on lowercase.sh . 4?# 5?# The ren utility, by Vladimir Lanin lanin@ , 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?# 例子 A-3.