Last Scid versions come without pgnscid shipped with it. That happens since version 4.6.0, when it was removed because it was stated as obsolete, according to changelog.
I guess that if pgnscid is now obsolete must be because another executable can be used to do what the former did, a command line utility to convert a pgn file into a scid database, but I'm not able to find out how to do it with the other executables packed with Scid.
Does anybody have a clue on which is pgnscid replacement?