Linux裡面可以在命令行裡形成對話框，用光標上下，左右選擇，一屏一屏的問答選擇，填寫。
whiptail是Linux不需要另行安裝，默認就有的，其它的比如dialog需要另行安裝，很麻煩，雖然功能比較好些。
帖一個寫好的東西。
#!/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" 是標題，雙引號裡是自己填的提示信息
--nocancel 是在這個圖文裡面不顯示取消，只顯示OK
--menu "Choose your option" 15 60 4 是表示菜單提示，雙引號裡是自己填的提示信息，15是高度，60是長度，4是有個選擇項目
下面的1-4是自己的提示
最後比較關鍵，3>&1 1>&2 2>&3是為了把選擇的內容填進變量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?" 是可以形成一個讓用戶輸入的提示框
@shenxu.com 是默認輸入text裡的值
whiptail --msgbox "You chose Cancel." 10 40 是顯示一行你的提示
其實還有--infobox，似乎和msgbox很像，其實不同，它基本上用不上，是在shell運行完後，可以往前翻頁能看見的東西
--scrolltext 20 40是為了顯示多行的時候可以上下滾動
另外還有--passwordbox和text一樣輸入，就是以***顯示
whiptail --checklist "choose" 15 60 2 "1" "aa" ON "2" "bb" ON
15 60還是高和寬，2是有幾個選項，和menu一樣，後面多了一個ON或者OFF表示狀態，就是菜單出來後默認是不是選，On是選，OFF不選，用空格鍵來選擇。可以多選。
--radiolist，不可以多選了。ON就只能有一個，其它必須是OFF
還有一個顯示進度條的--gauge，我覺得沒啥用處。
#!/bin/bash
{
for n in `seq 100`
do
sleep 1
echo $n
done
} | whiptail --gauge "Please wait while installing" 6 60 0
