title: How to remove a line from a manifest file inside a jar, from the command line?
body: <p>i need to remove a line from the MANIFEST.MF inside a jar, I tried extracting it and generating a new manifest and using jar umf to put it inside again, but it not worked and the line is still inside the jar. I do not want to rebuild the jar and neither do it manually using 7-zip, there are many files that I need to remove the exact key inside the manifest.</p>
  
  <p>I need to remove this line because without this line the device I´m trying to install the midlets aborts the install with it.</p>
  
  <p>Thanks.</p>