fileopen命令实现
fileopen命令是为了实现Mac系统下，在终端中用应用打开文件。
首先将目录 /Users/huanghuan/Work/MyCMD 命令加入环境变量中，Mac下可配置在 /etc/bashrc 中。然后创建 fileopen 文件，其内容为：
1 #! /bin/sh 2 if [ $# != 2 ] 3 then 4 echo "输入参数错误!" 5 else 6 search_result=`find /Applications -maxdepth 1 -name *${1}*.app | wc -l` 7 app_list=`find /Applications -maxdepth 1 -name *${1}*.app` 8 if (($search_result<=0)) 9 then 10 echo "未找到对应程序" 11 elif (($search_result==1)) 12 then 13 echo "打开文件" 14 open ${app_list} ${2} 15 else 16 echo "符合条件的程序有:/n${app_list}" 17 echo "请重新输入正确的程序名" 18 fi 19 fi 20 exit 命令的运行效果如下：
PS:该命令将进一步完善，目前作为一个Shell练习而简单实现
todo命令实现
todo命令实际上就是实现了一个toDoList的小命令，配置如fileopen命令，其内容为：
1 #! /bin/sh 2 3 path="/Users/huanghuan/Work/MyCMD/toDoList" 4 5 while getopts a:r: option 6 do 7 case $option in 8 a) 9 echo ${OPTARG}" 创建时间:"`date +%Y年-%m月-%d日` >>$path 10 ;; 11 r) 12 if [ -f "$path" ] 13 then 14 gsed -i "${OPTARG}d" $path 15 fi 16 ;; 17 ?) 18 echo "Usage: toDo [-arp] [arg]" 19 echo "-a add todo item" 20 echo "-r remove todo item" 21 echo "-p print todo List" 22 exit 23 ;; 24 esac 25 done 26 27 echo "当前待办项目:" 28 if [ -f "$path" ] 29 then 30 cat -n $path 31 fi 32 exit 命令的运行效果如下：
该命令的扩展参见： todo扩展
Valid Phone Numbers
来源于Leetcode题目： Valid Phone Numbers
Given a text file file.txt that contains list of phone numbers (one per line), write a one liner bash script to print all valid phone numbers.
You may assume that a valid phone number must appear in one of the following two formats: (xxx) xxx-xxxx or xxx-xxx-xxxx. (x means a digit)
You may also assume each line in the text file must not contain leading or trailing white spaces.
For example, assume that file.txt has the following content:
987-123-4567 123 456 7890 (123) 456-7890 Your script should output the following valid phone numbers:
987-123-4567 (123) 456-7890 脚本代码：
grep -E '^([0-9]{3}-|/([0-9]{3}/) )[0-9]{3}-[0-9]{4}$' file.txt 使用 -E 可以少写很多转义字符，这道题还值得注意的是： what’s the difference between /d and [0-9] in grep
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