Introduction to Linux programming-Dialog

Introduction to Linux programming-Dialog -- general Linux technology-Linux programming and kernel information. The following is a detailed description. Introduction to Linux programming-Dialog

Dialog is used in shell scripts. In fact, when you download Linux Kernel, there is

The scripts/lxdialog directory is actually the original dialog code, just Linux kernel to avoid

Do not conflict with the original dialog. Change the name to lxdialog. When you use "make menuconfig"

Dialog is used. In addition, the Slackware installation program is actually used

The dialog tool is used as the interface.


You can call dialog using shell script or perl to provide

User-friendly interface.


With the dialog tool, you can enable

Use Shell Script to complete complex operation interfaces, greatly reducing product development time.



You can use "man dialog" to check its usage. Here we will make some usage and demonstration of dialog.


Dialog -- clear


The entire screen is cleared and left


Dialog -- create-rc file


Dialog supports dynamic planning, which generates a sample.


Dialog [-- title] [-- backtitle]

[-- Clear] [-- separate-output] box-options


-- Title


Title text on the dialog box


-- Backtitle


Desktop background title


Box-options


Dialog currently provides yes/no box, menu box, input box, message box, text

There are nine widgets in box, info box, checklist box, radiolist box, and gauge box.


Exit Status


If you press Yes or OK, 0 is returned. No or Cancel returns 1. If you press ESC or

-1 is returned.


-- Yesno text height width


[Foxman @ foxman/] # dialog -- title "hello" -- backtitle "Dialog"

-- Yesno "Is everything okay" 20 60



-- Msgbox text height width


[Foxman @ foxman/] # dialog -- title "hello" -- backtitle "Dialog"

-- Msgbox "Is everything okay" 20 60



-- Infobox text height width


[Foxman @ foxman dialog] # dialog -- title "hey" -- backtitle "Dialog"

-- Infobox "Is everything okay? "10 60


Infobox leaves immediately after the message is displayed. In the console, the message is left,

At Terminal, the X Terminal will immediately clear the message, and the Screen Shot cannot be caught. Therefore

No ScreenShot. You can test it on the console.


-- Inputbox text height width [init]


[Foxman @ foxman dialog] # dialog -- title "hey" -- backtitle "Dialog"

-- Inputbox "Is everything okay? "10 60" yes"






-- Textbox file height width


[Foxman @ foxman copyright] # dialog -- title "Array 30" -- backtitle "All

For Chinese "-- textbox array30 20 75



Textbox is like a simple text viewer, which displays the text in the file.


-- Menu text height width menu-height [tag item]...


[Foxman @ foxman dialog] # dialog -- title "Menu Example" -- menu "MENU"

20 60 4 tag1 "item1" tag2 "item2" tag3 "item3" tag4 "item4"






-- Checklist text height width list-height [tag item status]

...


[Foxman @ foxman dialog] # dialog -- title "CheckList Example"

-- Checklist "Check List" 20 60 4 tag1 "item1" on tag2 "item2" off

Tag3 "item3" on tag4 "item4" off



-- Radiolist text height width list-height [tag item status

]...


[Foxman @ foxman dialog] # dialog -- title "RadioList Example"

-- Radiolist "Radio List" 20 60 4 tag1 "item1" on tag2 "item2" off

Tag3 "item3" on tag4 "item4" off



-- Gauge text height width percent


[Foxman @ foxman dialog] # dialog -- title "Installation" -- backtitle

"Star Linux" -- gauge "Linux Kernel" 10 60 50



After the gauge widget is started, it reads percent from stdin and ends when EOF is read.



Advanced use with Shell Script


It is not enough to know how to use each function. Generally, you need to know how to work with scripts.

.

Yesno, inputbox, menu, checklist, radiolist, and gauge are required.


Yesno


Example

#! /Bin/sh


DIALOG = dialog


If $ DIALOG -- title "WCW v. s. NWO" -- backtitle "Wrestling "\

-- Yesno "Are you ready to rumble? "5 60; then

Echo "Yeahhhhh"

Else

Echo "Nap ..."

Fi


Inputbox


Example

#! /Bin/sh


DIALOG = dialog


If $ DIALOG -- title "The future is here "\

-- Inputbox "Where do you want to go tomorrow? "\

10 75 "Penguin" 2> my_own_destiny

Then

Way = 'cat my_own_destiny'

Echo "My way is $ way"

Else

Echo "freak out"

Fi


Menu


#! /Bin/sh


If dialog -- title "title "\

-- Menu "MENU" 20 60 14 \

Tag1 "item1" tag2 "item2" 2> select

Then

Selection = 'cat select'

Echo "my selection is $ selection"

Else

Echo "go"

Fi


Checklist


#! /Bin/sh


If dialog -- title "title "\

-- Checklist "checklist" 20 60 14 \

Tag1 "item1" on tag2 "item2" off 2> select

Then

Selections = 'cat select'


Echo "My selections are :"

For I in $ selections; do

Echo $ I

Done


Else

Echo "go"

Fi


Radiolist


#! /Bin/sh


If dialog -- title "title "\

-- Radiolist "checklist" 20 60 14 \

Tag1 "item1" on tag2 "item2" off 2> select

Then

Selection = 'cat select'

Echo "My selection is $ selection"

Else

Echo "go"

Fi


Gauge