《Linux_Shell_Bash_精彩脚本示例》.docVIP

Linux Shell Bash 精彩脚本示例/content/10/0303/18/155970shtml 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?#  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 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_BADARG