Take the 2-minute tour ×
Ask Ubuntu is a question and answer site for Ubuntu users and developers. It's 100% free, no registration required.

Things like this, my friend send me a package named qcon.zip with his Mac pc. I use ubuntu system,when I use the command to unzip the folder,I found something was wrong.I check the permission,and use another soft named 7z,but it can't work now.

when i use the command
unzip qcon.zip

unzip qcon.zip -d test/

it returns me that:

unzip: cannot find or open ”-O, ”-O.zip or ”-O.ZIP.

So after install 7z,the command I use ,

Error: qcon.zip: Can not open file as archive

--add the command file---

file qcon.zip

it returns
qcon.zip: Zip archive data, at least v1.0 to extract

So,what can I do now,the folder permission is right.

share|improve this question
Can you check that qcon.zip file with the file command. So in a terminal type: file qcon.zip. What's the answer? –  user85164 Nov 5 '13 at 3:30
I add it to the question! –  sgsheg Nov 5 '13 at 3:48
Is it possible that you calculate the md5 checksum of qcon.zip and compare it with the md5 checksum that your friend calculates on his Mac? –  user85164 Nov 5 '13 at 4:19
I can't find the method to resolve it.Maybe I should use the system with Mac,honest, I don't like Mac. –  sgsheg Nov 5 '13 at 4:49

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Browse other questions tagged or ask your own question.