i'm kind of lost with so many commands,

is dpkg the one ?
i need to put version number, dependencies in the package.
when install it, i'm hope it'll automatically install dependencies if it's not there.

Many thanks !

Hello 5883, your post isn't clear. Before anyone can give you decent advice, we need to know exactly what it is you're trying to accomplish.
From what i grasp, you are attempting to create a package. Before we help you, tell us why you are creating a package.
I suspect there is perhaps a better way to do what you desire.

Ubuntu uses .deb packages, so see here:

http://www.webupd8.org/2010/01/how-t...tu-debian.html

That's one article out of many found by doing a websearch.

looks cool, let me read into it.

Sorry about that, my question is not clear because i have no experience in this area,

We sell black boxes to customers, ubuntu linux is running in such embedded system boxes. But no screen, no console. You can download packages to them from our windows utility as you know the ip, then our app running in the system will pick them up and starts the upgrade.

The requirement from the top is: customer should be able to upgrade kernel, file system, out app using apt-get install, or any of the combinations from these 3.
Also this upgrade should be able to handle all cases without technician on the site if possible: e.g. you lost power in the middle of upgrade, your new app has a bug and system won't start after upgrade, or your kernel has a bug and it just won't boot up...
Also in the system you are only allowed to keep 1 copy of kernel, 1 copy of fs, 2 copies of app. So if kernel is screwed up, you don't have a way to boot from another kernel easily.

Don't ask me why, management just doesn't listen to most engineers, and i have a family to feed.

So my 1st question is, with several package commands, which ones can handle above tasks.

Al them upgrades can be done by 'apt-get update && apt-get upgrade'.
I still don't understand why you need to create a package.

say we are using ubuntu distribution, the kernel needs to be reconfigured for our system, just apt-get upgrade will point you to the standard kernel released by vendor, but that won't include our customized drivers etc.

same thing for file system, we'll customize it from vendor distribution by adding extra stuff, then rebuild a new file system package.

i could be wrong, but this is what i was told.

Well first you'll need fakeroot devscripts build-essentials installed.
You will also need the dependencies plus the dev files for dependencies of what ever package you are creating.
You download the source cd in there and nice debuild -us -uc should do it.

I have only built one deb file from source. The instruction i've given you are what i used. I was in a hurry and haven't looked into the details behind them, so they may be taylored to that specific package. The kernel may even have it's own set of logistics. I would do a search on the debian wiki.