well, this won't work that way.
1. the configure script wants some user input. Just calling it won't work. OTOH, you usually don't need to reconfigure once you ran configure (except sometimes when there are changes to the configure script). For example, I have a small script that builds all manuals, and I don't run configure first -- I did that when initially setting up the build folders.
2. you don't need to cd to the folder before running make as make can do this for you. Just use "make -C build all zip"
3. you don't need to move the zip file to the Ipod (you can do so, of course). Just provide unzip the path where to extract the files, i.e. "unzip -d /volumes/ipod/ rockbox.zip"
4. to improve the script you might want to verify if the Ipod is actually mounted before extracting the build.