jaaniic'ša pierakstu klade

Create a directory to make your package in. The name should be the same as the package name.
mkdir helloworld_1.0-1

Pretend that the packaging directory is actually the root of the file system. Put the files of your program where they would be installed to on a system.
mkdir helloworld_1.0-1/usr
mkdir helloworld_1.0-1/usr/local
mkdir helloworld_1.0-1/usr/local/bin
cp "~/Projects/Hello World/helloworld" helloworld_1.0-1/usr/local/bin

Now create a special metadata file with which the package manager will install your program…
mkdir helloworld_1.0-1/DEBIAN
gedit helloworld_1.0-1/DEBIAN/control

Put something like this in that file…
Package: helloworld
Version: 1.0-1
Section: base
Priority: optional
Architecture: i386
Depends: libsomethingorrather (>= 1.2.13), anotherDependency (>= 1.2.6)
Maintainer: Your Name <you@email.com>
Description: Hello World
When you need some sunshine, just run this
small program!

(the space before each line in the description is important)

Now you just need to make the package:
dpkg-deb --build helloworld_1.0-1

Script files in /DEBIAN/ folder
Postinst means: "AFTER the files have been Copied To the iDevice, THEN Run this Script."
Preinst means: "BEFORE the files Get Copied To the iDevice, Run this Script, THEN Copy the files To the iDevice."
Postrm means: "AFTER the files have been Removed From the iDevice, THEN Run this Script."
Prerm means: "BEFORE the files Get Removed From your iDevice, Run this Script, THEN Remove the files From the iDevice."
Sample postinst:
#!/bin/bash
cd /var/mobile/Applications/*/Game.app
mkdir Backups
cp -a ./Original_File.ext ./Backups/Original_File.bak
killall Game
mv -f /var/mobile/Documents/GameMod/Game/* ./
exit 0