Cannot "zip" a folder

[greyhound]

In Fedora 8 i used a batch-file to customize and build e.g. a Firefox-theme.
Example:
#!/bin/sh
rm theme.jar
ark * --add-to theme.zip
sleep 5
mv theme.zip theme.jar

In Fedora 10 this does not work anymore. I get: Unknown Option „add-to“.
What is wrong. Is there an alternative to ark?

[fnmblot]

From what I am seeing, it looks like ark is gui only now. I may be wrong though. Have you tried using tar?

[greyhound]

Thanks for your help.
Replaced line 3 with: zip -rq theme.zip *
No need for delay anymore.