Linux里面可以在命令行里形成对话框，用光标上下，左右选择，一屏一屏的问答选择，填写。

whiptail是Linux不需要另行安装，默认就有的，其它的比如dialog需要另行安装，很麻烦，虽然功能比较好些。


帖一个写好的东西。

#!/bin/bash
trap "" 2
while true
do
OPTION=$(whiptail --title "Email Manager" --nocancel --menu "Choose your option" 15 60 4 \
"1" "Add Email User" \
"2" "Delete Email User" \
"3" "List Email User" \
"4" "EXIT"  3>&1 1>&2 2>&3)
    case $OPTION in
     1)
        EmailAddress=$(whiptail --title "EmailAddress-form Input Box" --inputbox "What is your add EmailAddress?" 10 60 @shenxu.com 3>&1 1>&2 2>&3)
        exitstatus=$?
        if [ $exitstatus = 0 ]; then
          grep $EmailAddress /etc/postfix/virtual_mailbox_maps>/dev/nul
          exitstatus=$?
            if [ $exitstatus = 0 ]; then
                whiptail --msgbox "The Email Address is a existed" 10 40
            elif (whiptail --title "Add Yes/No Box" --yesno "Are you sure add $EmailAddress." 10 60) then
               /etc/postfix/mailadd.sh $EmailAddress
               whiptail --msgbox "The Email Address $EmailAddress is a added." 10 40
            fi
        else
          whiptail --msgbox "You chose Cancel." 10 40
        fi
      ;;
     2)
        EmailAddress=$(whiptail --title "EmailAddress-form Input Box" --inputbox "What is your Delete EmailAddress?" 10 60 @shenxu.com 3>&1 1>&2 2>&3)
        exitstatus=$?
        if [ $exitstatus = 0 ]; then
          grep $EmailAddress /etc/postfix/virtual_mailbox_maps>/dev/nul
          exitstatus=$?
            if [ $exitstatus != 0 ]; then
                whiptail --msgbox "The Email Address $EmailAddress is a not exist." 10 40
            elif (whiptail --title "Add Yes/No Box" --yesno "Are you sure delete $EmailAddress." 10 60) then
               /etc/postfix/maildel.sh $EmailAddress
               whiptail --msgbox "The Email Address $EmailAddress is a deleted." 10 40
            fi
        else
          whiptail --msgbox "You chose Cancel." 10 40
        fi
      ;;
     3)
        EmailAddress=$(cat /etc/postfix/virtual_mailbox_maps | awk '{print $1}')
         whiptail --msgbox "The Email User list are $EmailAddress." --scrolltext 20 40
      ;;
     4)
        echo "EXIT"
        break
      ;;
   esac
done
trap : 2



whiptail --title "Email Manager" --nocancel --menu "Choose your option" 15 60 4 \
"1" "Add Email User" \
"2" "Delete Email User" \
"3" "List Email User" \
"4" "EXIT"  3>&1 1>&2 2>&3

--title "Email Manager" 是标题，双引号里是自己填的提示信息

--nocancel 是在这个图文里面不显示取消，只显示OK

--menu "Choose your option" 15 60 4 是表示菜单提示，双引号里是自己填的提示信息，15是高度，60是长度，4是有个选择项目

下面的1-4是自己的提示

最后比较关键，3>&1 1>&2 2>&3是为了把选择的内容填进变量OPTION


whiptail --title "EmailAddress-form Input Box" --inputbox "What is your add EmailAddress?" 10 60 @shenxu.com 3>&1 1>&2 2>&3

--inputbox "What is your add EmailAddress?" 是可以形成一个让用户输入的提示框

@shenxu.com 是默认输入text里的值


whiptail --msgbox "You chose Cancel." 10 40 是显示一行你的提示

其实还有--infobox，似乎和msgbox很像，其实不同，它基本上用不上，是在shell运行完后，可以往前翻页能看见的东西

--scrolltext 20 40是为了显示多行的时候可以上下滚动


另外还有--passwordbox和text一样输入，就是以***显示

whiptail --checklist "choose" 15 60 2 "1" "aa" ON "2" "bb" ON

15 60还是高和宽，2是有几个选项，和menu一样，后面多了一个ON或者OFF表示状态，就是菜单出来后默认是不是选，On是选，OFF不选，用空格键来选择。可以多选。

--radiolist，不可以多选了。ON就只能有一个，其它必须是OFF

还有一个显示进度条的--gauge，我觉得没啥用处。

#!/bin/bash
 {
     for n in `seq 100`
     do
         sleep 1
    echo $n
     done
 } | whiptail --gauge "Please wait while installing" 6 60 0