How can I extract multiple 7z files in folder at once in Ubuntu?

Question

How can I extract about 900 7z files which are all located in the same folder (all have only one file inside) without doing it one by one?

I am using Ubuntu 10.10. All files are located in /home/username/folder1/folder2.

Answer 1

7za -y x "*.7z"  

The above code worked for me

Answer 2

for arc in *.7z do   7zwhatever "$arc" done