Android-App Development: commandline tools of the android-sdk

After setting up the development environment for Android apps, i was curious about the downloaded android sdk. So what about just trying to look into this "android-sdk" directory:
It contains the following directories (only first two levels listed:

.
├── add-ons
├── platforms
│   └── android-16
├── platform-tools
│   ├── aapt
│   ├── adb
│   ├── aidl
│   ├── api
│   ├── dexdump
│   ├── dx
│   ├── fastboot
│   ├── lib
│   ├── llvm-rs-cc
│   ├── NOTICE.txt
│   ├── renderscript
│   └── source.properties
├── temp
└── tools
    ├── adb_has_moved.txt
    ├── android
    ├── ant
    ├── apkbuilder
    ├── apps
    ├── ddms
    ├── dmtracedump
    ├── draw9patch
    ├── emulator
    ├── emulator-arm
    ├── emulator-x86
    ├── etc1tool
    ├── hierarchyviewer
    ├── hprof-conv
    ├── lib
    ├── lint
    ├── mksdcard
    ├── monitor
    ├── monkeyrunner
    ├── NOTICE.txt
    ├── proguard
    ├── source.properties
    ├── sqlite3
    ├── support
    ├── systrace
    ├── templates
    ├── traceview
    └── zipalign

The first command i tried was:

schroff@hades:$ ./apkbuilder


<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
THIS TOOL IS DEPRECATED and may stop working at any time!

If you wish to use apkbuilder for a custom build system, please look at the
com.android.sdklib.build.ApkBuilder which provides support for
recent build improvements including library projects.
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>


A command line tool to package an Android application from various sources.
Usage: apkbuilder <out archive> [-v][-u][-storetype STORE_TYPE] [-z inputzip]
            [-f inputfile] [-rf input-folder] [-rj -input-path]

    -v      Verbose.
    -d      Debug Mode: Includes debug files in the APK file.
    -u      Creates an unsigned package.
    -storetype Forces the KeyStore type. If ommited the default is used.

    -z      Followed by the path to a zip archive.
            Adds the content of the application package.

    -f      Followed by the path to a file.
            Adds the file to the application package.

    -rf     Followed by the path to a source folder.
            Adds the java resources found in that folder to the application
            package, while keeping their path relative to the source folder.

    -rj     Followed by the path to a jar file or a folder containing
            jar files.
            Adds the java resources found in the jar file(s) to the application
            package.

    -nf     Followed by the root folder containing native libraries to
            include in the application package.

Hmm. Does not really look as i expected.
DDMS opened the following window named Davlik Debug Monitor:

The command hierarchyviewer launched this window:

Last try: monitor came up with:

But i think, i have to follow the tutorial to see, how all these things work together. At least all commands work (no seg faults)...