How to delete all files in a folder inside an archive with 7zip?
<p>I have an archive file, which has a lot of folders inside of it:</p>

<pre><code>- myfile.zip
  - folder1
  - folder2
  - folder3
     - folder3file1.txt
     - folder3file2.txt
</code></pre>

<p>How can I delete all files from the folder3, without deleting that folder, in one command line?</p>

<p>I know only the way to delete the folder3, and then add it as a new, empty folder, but this causes double 7zip information printing to command line.</p>

<p>Or how could I set to not to print the 7zip informations during 7z commands?</p>