shell学习与使用，边学边用之五！（实现一个简单的通讯录）
banxi1988@banxi:~/work/shell$ cat addrList.sh #!/bin/bash# addrList.sh# 实现一个简单的通讯录程序，联系人信息的添加，修改，删除，查找等操作。# ## 显示菜单#declare operation; ## TODO use global vardeclare QUIT_FLAG;let QUIT_FLAG="0";#export QUIT_FLAGshowMenu() {echo "====================================================";echo "| ***************我的通讯录************************|";echo "====================================================";echo "|[添加联系人（add）] | [编辑联系人（edit n）] |";echo "|[查找联系人（find)] | [删除联系人（delete n)] |";echo "|[查看全部（all)] | [查看前面n位（list n)] |";echo "|[退出程序（quit)] | [查看前面n位（list n)] |";echo "====================================================";echo -n "***请输出操作命令>";}selectOperation() {read operationecho "正在执行命令: $operation...";#set -xif [ $operation = "add" ]thenecho -n "请输入联系人姓名：>";read name;echo -n "请输入联系人电话号码:>";read phoneecho "$name $phone" >> my_addr_list.txtelif [ $operation = "edit" ]thenecho "暂时没有实现"elif [ $operation = "find" ]thenecho "prepare find...";elif [ $operation = "delete" ]thenecho "prepare delete...";elif [ $operation = "all" ]thenecho "正在读取...";cat my_addr_list.txtelif [ $operation = "list" ]thenecho "list...";elif [ $operation = "quit" ]thenset -xQUIT_FLAG="1"; ## quitset +xelseecho "WRONG:no such menu choice!";fiset +x}main() {set -x ## for debugecho $quitwhile [ "$QUIT_FLAG" -eq 0 ]doset +xshowMenu;selectOperation;done;}main

测试运行结果如下：

banxi1988@banxi:~/work/shell$ bash addrList.sh + echo+ '[' 0 -eq 0 ']'+ set +x====================================================| ***************我的通讯录************************|====================================================|[添加联系人（add）] | [编辑联系人（edit n）]       ||[查找联系人（find)] | [删除联系人（delete n)]      ||[查看全部（all)]    | [查看前面n位（list n)]      ||[退出程序（quit)]    | [查看前面n位（list n)]      |====================================================***请输出操作命令>quit正在执行命令: quit...+ QUIT_FLAG=1+ set +xbanxi1988@banxi:~/work/shell$ bash addrList.sh + echo+ '[' 0 -eq 0 ']'+ set +x====================================================| ***************我的通讯录************************|====================================================|[添加联系人（add）] | [编辑联系人（edit n）]       ||[查找联系人（find)] | [删除联系人（delete n)]      ||[查看全部（all)]    | [查看前面n位（list n)]      ||[退出程序（quit)]    | [查看前面n位（list n)]      |====================================================***请输出操作命令>edit正在执行命令: edit...暂时没有实现====================================================| ***************我的通讯录************************|====================================================|[添加联系人（add）] | [编辑联系人（edit n）]       ||[查找联系人（find)] | [删除联系人（delete n)]      ||[查看全部（all)]    | [查看前面n位（list n)]      ||[退出程序（quit)]    | [查看前面n位（list n)]      |====================================================***请输出操作命令>quit正在执行命令: quit...+ QUIT_FLAG=1+ set +x

上面的代码中，在做菜单功能中全局变量 QUIT_FLAG花了我很多的时间，应该开始这个全局变量就是不全局。还见到一本书上在quit命令的if分支用
$QUIT_FLAG="1"来赋值。这样做在我这里的测试中是有问题吧。

修改之后将代码结构调整之后，如下：

#!/bin/bash# addrList.sh# 实现一个简单的通讯录程序，联系人信息的添加，修改，删除，查找等操作。# ## 显示菜单#declare operation; ## TODO use global vardeclare QUIT_FLAG;let QUIT_FLAG="0";#export QUIT_FLAGshowMenu() {echo "====================================================";echo "| ***************我的通讯录************************|";echo "====================================================";echo "|[添加联系人（add）] | [编辑联系人（edit n）]       |";echo "|[查找联系人（find)] | [删除联系人（delete n)]      |";echo "|[查看全部（all)]    | [查看前面n位（list n)]      |";echo "|[退出程序（quit)]    | [查看前面n位（list n)]      |";echo "====================================================";echo -n "***请输出操作命令>";}selectOperation() {read operationecho "正在执行命令: $operation...";#set -xif [ $operation = "add" ]thendoAdd ## doAdd()elif [ $operation = "edit" ]thenecho  "暂时没有实现"elif [ $operation = "find" ]thendoFind ## doFind() elif [ $operation = "delete" ]thenecho "prepare delete...";elif [ $operation = "all" ]thendoAll ## doAll()elif [ $operation = "list" ]thenecho "list...";elif [ $operation = "quit" ]thenset -xQUIT_FLAG="1"; ## quitset +xelseecho "WRONG:no such menu choice!";fiset +x}doAdd() {echo "do add...";echo -n "请输入联系人姓名：>";read name;echo -n "请输入联系人电话号码:>";read phoneecho "$name $phone" >> my_addr_list.txt}doFind() {echo -n "请输入查找条件：>";read cond;### TODO judge if my_addr_list.txt is existsif [ -e my_addr_list.txt ]thenecho `grep -in $cond my_addr_list.txt`elseecho "通讯录暂时为空";fi}doAll() {if [ -e my_addr_list.txt ]thenecho "===================所有联系人信息如下：============";echo cat my_addr_list.txtecho "===================================================";elseecho "通讯录暂时为空";fi}main() {set -x ## for debugecho $quitwhile [ "$QUIT_FLAG" -eq 0 ]doset +xshowMenu;selectOperation;done;}main

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