combinedeltarpm creates a new deltarpm from multiple old ones. Applying the resulting deltarpm has the
same effect as applying each of the old ones in the specified order. Use the -v option to make
combinedeltarpm more verbose about its work.
combinedeltarpm normally produces a V3 format deltarpm, use the -V option to specify a different version
if desired. The -z option can be used to specify a different compression method, the default is to use
the same compression method as used in the last of the old deltarpms.
If you want to use a different header signature you can also specify a rpm with the -S option which will
be used as signature reference. This feature can be used to if a deltarpm was made against an unsigned
rpm which was later signed.