writing a small manual.

Readme.md

@@ -1,3 +1,42 @@
 # apt-offline2bat.sh
 
-This script
+This script is used to creat an batch script for downloading all needed files and packages needed by 'apt-offline'. The created batch script will need curl and zip to be installed on windows.
+
+# Usage of apt-offline
+
+Apt-Offline is an offline download helper to updateing debian based linux distributions. It should be possible to install apt-offline via `apt install apt-offline`.
+
+# Update packages database
+
+The following two commands will create at first the `apt-offline.sig` file and at second the `apt-offline.bat` file to be run on the windows mashine.
+
+    apt-offline set --update apt-offline.sig
+    apt-offline2bat.sh apt-offline.sig apt-offline.bat
+    
+After the `bundle.zip` file is created and copied to the offline linux system, you can install the files.
+
+    apt-offline install bundle.zip
+
+# Update the system
+
+We create again the `apt-offline.sig` file and `apt-offline.cmd` file to download the needed data. If only an upgrade is needed, change the upgrade-type to upgrade.
+
+    apt-offline set --upgrade --upgrade-type=dist-upgrade apt-offline.sig
+    apt-offline2bat.sh apt-offline.sig apt-offline.bat
+
+Run the batch script and copy the `bundle.zip` file to the offline system. After this is done install the `bundle.zip` file and upgrade the system.
+
+    apt-offline install bundle.zip
+    apt dist-upgrade
+
+# Install packages
+
+Run the commands.
+
+    apt-offline set --install-packages PACKAGE1 PACKAGE2 ... --update apt-offline.sig
+    apt-offline2bat.sh apt-offline.sig apt-offline.bat
+
+Run the script, copy the `bundle.zip` file to the offline system. And install everything with the folloging commands.
+
+    apt-offline install bundle.zip
+    apt install PACKAGE1 PACKACGE2 ...