Adding unzipped files to a Zip


 
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# 1  
Computer Adding unzipped files to a Zip

Hey all,

I have a zip file which I received, and I need to replace one of the files inside of it.

I tried the obvious solution of unzipping the zip, replacing the file, and rezipping, but the following happened:

Original Zip Size: 79MB
Unzipped Size 80MB
New Zip: 36MB

When I feed the zip to the program for which it was intended, the program rejects the zip being unable to read it properly.

So, since the zip file and its unzipped version both have very similar sizes, I assumed the data in the zip simply isn't compressed at all. Therefore, I used the command
Code:
zip -rn

to replace the file without compression. However, when I fed the zip to the program, again, it did not work.

My question: How do I replace the file using whatever compression the zip originally went through before it came to me?

Thank you so much!
# 2  
Code:
zip archive.zip file

will replace the file, if it is already in the archive, add otherwise.
# 3  
Might need to take a closer look at the original zip file, there's lots of miscellaneous attributes it's accumulated over the years.

Code:
zipinfo file.zip

 

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