I was looking for an answer, I thought I found it, but it doesn't work correctly :-S
Question: I want to pack: /foo/bar/dir/* but when I unpack the tar I would like to have /dir/*
So i thought:
1) tar -cvf file.tar /foo/bar/dir -C /dir
2) tar -cvf file.tar /foo/bar/dir -C /foo/bar
But when I open the TARs they both have the first dir: foo, then bar etc...