Deletes files from archive.
7z d archive.zip *.bak -r
deletes *.bak files from archive archive.zip.
7-Zip doesn't uses the system wildcard parser. 7-Zip doesn't follow the archaic rule by which *.* means any file. 7-Zip treats *.* as matching the name of any file that has an extension. To process all files, you must use a * wildcard.
  -i (Include)
  -m (Method)
  -p (Set Password)
  -r (Recurse)
  -u (Update)
  -w (Working Dir)
  -x (Exclude)
Commands: a (Add), u (Update)
Switches: -u (Update)